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  • Energy absorption and coupling to electrons in the transition from surface- to volume-dominant intense laser–plasma interaction regimes
    New J. Phys. (IF 3.773) Pub Date : 2020-05-27
    S D R Williamson, R J Gray, M King, R Wilson, R J Dance, C Armstrong, D R Rusby, C Brabetz, F Wagner, B Zielbauer, V Bagnoud, D Neely and P McKenna

    The coupling of laser energy to electrons is fundamental to almost all topics in intense laser–plasma interactions, including laser-driven particle and radiation generation, relativistic optics, inertial confinement fusion and laboratory astrophysics. We report measurements of total energy absorption in foil targets ranging in thickness from 20 μ m, for which the target remains opaque and surface interactions

    更新日期:2020-05-27
  • Scalable characterization of localizable entanglement in noisy topological quantum codes
    New J. Phys. (IF 3.773) Pub Date : 2020-05-27
    David Amaro, Markus Müller and Amit Kumar Pal

    Topological quantum error correcting codes have emerged as leading candidates towards the goal of achieving large-scale fault-tolerant quantum computers. However, quantifying entanglement in these systems of large size in the presence of noise is a challenging task. In this paper, we provide two different prescriptions to characterize noisy stabilizer states, including the surface and the color codes

    更新日期:2020-05-27
  • Zigzag approach to higher key rate of sending-or-not-sending twin field quantum key distribution with finite-key effects
    New J. Phys. (IF 3.773) Pub Date : 2020-05-27
    Cong Jiang, Xiao-Long Hu, Hai Xu, Zong-Wen Yu and Xiang-Bin Wang

    Odd-parity error rejection (OPER), in particular the method of actively odd parity pairing (AOPP), can drastically improve the asymptotic key rate of sending-or-not-sending twin-field (SNS-TF) quantum key distribution (QKD). However, in practice, the finite-key effects have to be considered for the security. Here, we propose a zigzag approach to verify the phase-flip error of the survived bits after

    更新日期:2020-05-27
  • Cross-diffusion on multiplex networks
    New J. Phys. (IF 3.773) Pub Date : 2020-05-27
    Shupeng Gao, Lili Chang, Xinyu Wang, Chen Liu, Xuelong Li and Zhen Wang

    During the past decades, pattern formulation with reaction–diffusion systems has attracted great research interest. Complex networks, from single-layer networks to more complicated multiplex networks, have made great contribution to the development of this area, especially with emergence of Turing patterns. While among vast majority of existing works on multiplex networks, they only take into account

    更新日期:2020-05-27
  • Finite-range effects in ultradilute quantum drops
    New J. Phys. (IF 3.773) Pub Date : 2020-05-27
    V Cikojević, L Vranješ Markić and J Boronat

    In the first experimental realization of dilute Bose–Bose liquid drops using two hyperfine states of 39 K some discrepancies between theory and experiment were observed. The standard analysis of the data using the Lee–Huang–Yang beyond mean-field theory predicted critical numbers which were significantly off the experimental measurements. Also, the radial size of the drops in the experiment proved

    更新日期:2020-05-27
  • Quantum phase transition inside the superconducting dome of Ba(Fe 1− x Co x ) 2 As 2 from diamond-based optical magnetometry
    New J. Phys. (IF 3.773) Pub Date : 2020-05-27
    K R Joshi, N M Nusran, M A Tanatar, K Cho, S L Bud’ko, P C Canfield, R M Fernandes, A Levchenko and R Prozorov

    Unconventional superconductivity often emerges in close proximity to a magnetic instability. Upon suppressing the magnetic transition down to zero temperature by tuning the carrier concentration, pressure, or disorder, the superconducting transition temperature T c acquires its maximum value. A major challenge is the elucidation of the relationship between the superconducting phase and the strong quantum

    更新日期:2020-05-27
  • Unifying thermodynamic uncertainty relations
    New J. Phys. (IF 3.773) Pub Date : 2020-05-27
    Gianmaria Falasco, Massimiliano Esposito and Jean-Charles Delvenne

    We introduce a new technique to bound the fluctuations exhibited by a physical system, based on the Euclidean geometry of the space of observables. Through a simple unifying argument, we derive a sweeping generalization of so-called thermodynamic uncertainty relations (TURs). We not only strengthen the bounds but extend their realm of applicability and in many cases prove their optimality, without

    更新日期:2020-05-27
  • Quantum correlations in the Kerr Ising model
    New J. Phys. (IF 3.773) Pub Date : 2020-05-26
    M J Kewming, S Shrapnel and G J Milburn

    In this article we present a full description of the quantum Kerr Ising model—a linear optical network of parametrically pumped Kerr nonlinearities. We consider the non-dissipative Kerr Ising model and, using variational techniques, show that the energy spectrum is primarily determined by the adjacency matrix in the Ising model and exhibits highly non-classical cat like eigenstates. We then introduce

    更新日期:2020-05-26
  • A faster horse on a safer trail: generalized inference for the efficient reconstruction of weighted networks
    New J. Phys. (IF 3.773) Pub Date : 2020-05-26
    Federica Parisi, Tiziano Squartini and Diego Garlaschelli

    Due to the interconnectedness of financial entities, estimating certain key properties of a complex financial system, including the implied level of systemic risk, requires detailed information about the structure of the underlying network of dependencies. However, since data about financial linkages are typically subject to confidentiality, network reconstruction techniques become necessary to infer

    更新日期:2020-05-26
  • Microswimmers in an axisymmetric vortex flow
    New J. Phys. (IF 3.773) Pub Date : 2020-05-26
    José-Agustín Arguedas-Leiva and Michael Wilczek

    Microswimmers are encountered in a wide variety of biophysical settings. When interacting with flow fields, they show interesting dynamical features such as hydrodynamic trapping, clustering, and preferential orientation. One important step towards the understanding of such features is to clarify the interplay of hydrodynamic flows with microswimmer motility and shape. Here, we study the dynamics of

    更新日期:2020-05-26
  • Scale-invariant spin dynamics and the quantum limits of field sensing
    New J. Phys. (IF 3.773) Pub Date : 2020-05-25
    Morgan W Mitchell

    We describe quantum limits to field sensing that relate noise, geometry and measurement duration to fundamental constants, with no reference to particle number. We cast the Tesche and Clarke (TC) bound on dc-SQUID sensitivity as such a limit, and find analogous limits for volumetric spin-precession magnetometers. We describe how randomly-arrayed spins, coupled to an external magnetic field of interest

    更新日期:2020-05-25
  • Constructing realistic effective spin Hamiltonians with machine learning approaches
    New J. Phys. (IF 3.773) Pub Date : 2020-05-25
    Xue-Yang Li, Feng Lou, Xin-Gao Gong and Hongjun Xiang

    The effective Hamiltonian method has recently received considerable attention due to its power to deal with finite-temperature problems and large-scale systems. In this work, we put forward a machine learning (ML) approach to generate realistic effective Hamiltonians. In order to find out the important interactions among many possible terms, we propose some new techniques. In particular, we suggest

    更新日期:2020-05-25
  • Terahertz electro-optical multi-functional modulator and its coupling mechanisms based on upper-layer double graphene ribbons and lower-layer a graphene strip
    New J. Phys. (IF 3.773) Pub Date : 2020-05-25
    Zhimin Liu, Enduo Gao, Xiao Zhang, Hongjian Li, Hui Xu, Zhenbin Zhang, Xin Luo and Fengqi Zhou

    A terahertz multifunction modulator composed of upper-layer double graphene ribbons and lower-layer a graphene strip, which can generate a Fano resonance produced by hybrid between a broad mode and a narrow mode, is proposed to realize electro-optical switch and filtering function. The electric field distribution, hybrid theory, and quantum level theory are all employed to explain the Fano resonance

    更新日期:2020-05-25
  • Non-classical current noise and light emission of an ac-driven tunnel junction
    New J. Phys. (IF 3.773) Pub Date : 2020-05-25
    Hongxin Zhan, Gianluca Rastelli and Wolfgang Belzig

    The nonsymmetrized current noise is crucial for the analysis of light emission in nanojunctions. The latter represent non-classical photon emitters whose description requires a full quantum approach. It was found experimentally that light emission can occur with a photon energy exceeding the applied dc voltage, which intuitively should be forbidden due to the Pauli principle. This overbias light emission

    更新日期:2020-05-25
  • Effective Hamiltonians for interacting superconducting qubits: local basis reduction and the Schrieffer–Wolff transformation
    New J. Phys. (IF 3.773) Pub Date : 2020-05-25
    Gioele Consani and Paul A Warburton

    An open question in designing superconducting quantum circuits is how best to reduce the full circuit Hamiltonian which describes their dynamics to an effective two-level qubit Hamiltonian which is appropriate for manipulation of quantum information. Despite advances in numerical methods to simulate the spectral properties of multi-element superconducting circuits (Yurke B and Denker J S 1984 Phys

    更新日期:2020-05-25
  • Scalable quantum computing stabilised by optical tweezers on an ion crystal
    New J. Phys. (IF 3.773) Pub Date : 2020-05-20
    Yu-Ching Shen and Guin-Dar Lin

    As it has been demonstrated that trapped ion systems have unmatched long-lived quantum-bit (qubit) coherence and can support high-fidelity quantum manipulations, how to scale up the system size becomes an inevitable task for practical purposes. In this work, we theoretically analyse the physical limitation of scalability with a trapped ion array, and propose a feasible scheme of architecture that in

    更新日期:2020-05-20
  • Topological spin–valley filtering effects based on hybrid silicene-like nanoribbons
    New J. Phys. (IF 3.773) Pub Date : 2020-05-20
    Jia-En Yang, Xiao-Long Lü, Chun-Xia Zhang and Hang Xie

    Topological edge states have crucial applications in nano spintronics and valleytronics devices, while topological inner-edge states have seldom been extensively researched in this field. Based on the inner-edge states of the hybridized zigzag silicene-like nanoribbons, we investigate their transport properties. We propose two types of spin–valley filters. The first type can generate two different

    更新日期:2020-05-20
  • Non-equilibrium growth of metal clusters on a layered material: Cu on MoS 2
    New J. Phys. (IF 3.773) Pub Date : 2020-05-20
    Dapeng Jing, Ann Lii-Rosales, King C Lai, Qiang Li, Jaeyoun Kim, Michael C Tringides, James W Evans and Patricia A Thiel

    We use a variety of experimental techniques to characterize Cu clusters on bulk MoS 2 formed via physical vapor deposition of Cu in ultrahigh vacuum, at temperatures ranging from 300 K to 900 K. We find that large facetted clusters grow at elevated temperatures, using high Cu exposures. The cluster size distribution is bimodal, and under some conditions, large clusters are surrounded by a denuded zone

    更新日期:2020-05-20
  • New techniques for a measurement of the electron’s electric dipole moment
    New J. Phys. (IF 3.773) Pub Date : 2020-05-19
    C J Ho, J A Devlin, I M Rabey, P Yzombard, J Lim, S C Wright, N J Fitch, E A Hinds, M R Tarbutt and B E Sauer

    The electric dipole moment of the electron (eEDM) can be measured with high precision using heavy polar molecules. In this paper, we report on a series of new techniques that have improved the statistical sensitivity of the YbF eEDM experiment. We increase the number of molecules participating in the experiment by an order of magnitude using a carefully designed optical pumping scheme. We also increase

    更新日期:2020-05-19
  • Spin current pumped by confined breathing skyrmion
    New J. Phys. (IF 3.773) Pub Date : 2020-05-18
    Chunlei Zhang, Jianing Wang, Chendong Jin, Zhaozhuo Zeng, Haiyan Xia, Jianbo Wang and Qingfang Liu

    Spin pumping is a widely recognized method to generate the spin current in the spintronics, which can be found in varieties of magnetic materials and is acknowledged as a fundamentally dynamic process equivalent to the spin-transfer torque. In this work, we theoretically verified the oscillating spin current mixed by AC and DC components can be pumped from the microwave-motivated breathing skyrmion

    更新日期:2020-05-18
  • Network dynamics on graphops
    New J. Phys. (IF 3.773) Pub Date : 2020-05-18
    Christian Kuehn

    In this article we report on a novel way to incorporate complex network structure into the analysis of interacting particle systems. More precisely, it is well-known that in well-mixed/homogeneous/all-to-all-coupled systems, one may derive mean-field limit equations such as Vlasov–Fokker–Planck equations (VFPEs). A mesoscopic VFPE describes the probability of finding a single vertex/particle in a certain

    更新日期:2020-05-18
  • Phononic loss in superconducting resonators on piezoelectric substrates
    New J. Phys. (IF 3.773) Pub Date : 2020-05-14
    Marco Scigliuzzo, Laure E Bruhat, Andreas Bengtsson, Jonathan J Burnett, Anita Fadavi Roudsari and Per Delsing

    We numerically and experimentally investigate the phononic loss for superconducting resonators fabricated on a piezoelectric substrate. With the help of finite element method simulations, we calculate the energy loss due to electromechanical conversion into bulk and surface acoustic waves. This sets an upper limit for the resonator internal quality factor Q i . To validate the simulation, we fabricate

    更新日期:2020-05-14
  • Unconventional superconductivity in Cu x Bi 2 Se 3 from magnetic susceptibility and electrical transport
    New J. Phys. (IF 3.773) Pub Date : 2020-05-11
    Yifei Fang, Wen-Long You and Mingtao Li

    Although the Cu doped Bi 2 Se 3 topological insulator was discovered and intensively studied for almost a decade, its electrical and magnetic properties in normal state, and the mechanism of ‘high- T c ’ superconductivity regarding the relatively low-carrier density are still not addressed yet. In this work, we report a systematic investigation of magnetic susceptibility, critical fields, and electrical

    更新日期:2020-05-11
  • Entanglement transmission through dense scattering medium
    New J. Phys. (IF 3.773) Pub Date : 2020-05-11
    Peng Huang and Guihua Zeng

    Scattering effects are ubiquitous in practical wireless optical links. Here a transmission model with complete consideration of scattered light and beam wandering effects for underwater link is developed, with the aim to completely characterize the received quantum state of light through dense scattering medium. Based on this model, we show the influence of scattered photons on the improvement of the

    更新日期:2020-05-11
  • Single-ion addressing via trap potential modulation in global optical fields
    New J. Phys. (IF 3.773) Pub Date : 2020-05-11
    Christopher M Seck, Adam M Meier, J True Merrill, Harley T Hayden, Brian C Sawyer, Curtis E Volin and Kenton R Brown

    To date, individual addressing of ion qubits has relied primarily on local Rabi or transition frequency differences between ions created via electromagnetic field spatial gradients or via ion transport operations. Alternatively, it is possible to synthesize arbitrary local one-qubit gates by leveraging local phase differences in a global driving field. Here we report individual addressing of 40 Ca

    更新日期:2020-05-11
  • VanQver: the variational and adiabatically navigated quantum eigensolver
    New J. Phys. (IF 3.773) Pub Date : 2020-05-11
    Shunji Matsuura, Takeshi Yamazaki, Valentin Senicourt, Lee Huntington and Arman Zaribafiyan

    The accelerated progress in manufacturing noisy, intermediate-scale quantum (NISQ) computing hardware has opened the possibility of exploring its application in transforming approaches to solving computationally challenging problems. The important limitations common among all NISQ computing technologies are the absence of error correction and the short coherence time, which limit the computational

    更新日期:2020-05-11
  • Four-wave mixing in spin–orbit coupled Bose–Einstein condensates
    New J. Phys. (IF 3.773) Pub Date : 2020-05-06
    Nguyen Viet Hung, Piotr Szańkowski, Vladimir V Konotop and Marek Trippenbach

    We describe possibilities of spontaneous, degenerate four-wave mixing (FWM) processes in spin–orbit coupled Bose–Einstein condensates. Phase matching conditions (i.e., energy and momentum conservation laws) in such systems allow one to identify four different configurations characterized by involvement of distinct spinor states in which such a process can take place. We derived these conditions from

    更新日期:2020-05-06
  • Skyrmion dynamics and topological sorting on periodic obstacle arrays
    New J. Phys. (IF 3.773) Pub Date : 2020-05-06
    N P Vizarim, C Reichhardt, C J O Reichhardt and P A Venegas

    We examine skyrmions under a dc drive interacting with a square array of obstacles for varied obstacle size and damping. When the drive is applied in a fixed direction, we find that the skyrmions are initially guided in the drive direction but also move transverse to the drive due to the Magnus force. The skyrmion Hall angle, which indicates the difference between the skyrmion direction of motion and

    更新日期:2020-05-06
  • A dynamical symmetry triad in high-harmonic generation revealed by attosecond recollision control
    New J. Phys. (IF 3.773) Pub Date : 2020-05-06
    Sergey Zayko, Ofer Kfir, Eliyahu Bordo, Avner Fleischer, Oren Cohen and Claus Ropers

    A key element of optical spectroscopy is the link between observable selection rules and the underlying symmetries of an investigated physical system. Typically, selection rules directly relate to the sample properties probed by light, yielding information on crystalline structure or chirality, for example. Considering light-matter coupling more broadly may extend the scope of detectable symmetries

    更新日期:2020-05-06
  • Non-equilibrium effects in a relativistic plasma sheath model
    New J. Phys. (IF 3.773) Pub Date : 2020-05-06
    A Formenti, A Maffini and M Passoni

    Plasma sheaths characterized by electrons with relativistic energies and far from thermodynamic equilibrium are governed by a rich and largely unexplored physics. A reliable kinetic description of relativistic non-equilibrium plasma sheaths—besides its interest from a fundamental point of view—is crucial to many application, from controlled nuclear fusion to laser-driven particle acceleration. Sheath

    更新日期:2020-05-06
  • Entanglement area law for shallow and deep quantum neural network states
    New J. Phys. (IF 3.773) Pub Date : 2020-05-06
    Zhih-Ahn Jia, Lu Wei, Yu-Chun Wu, Guang-Can Guo and Guo-Ping Guo

    A study of the artificial neural network representation of quantum many-body states is presented. The locality and entanglement properties of states for shallow and deep quantum neural networks are investigated in detail. By introducing the notion of local quasi-product states, for which the locally connected shallow feed-forward neural network states and restricted Boltzmann machine states are special

    更新日期:2020-05-06
  • Strain and electric field control of magnetism in La (1-- x ) Sr x MnO 3 thin films on ferroelectric BaTiO 3 substrates
    New J. Phys. (IF 3.773) Pub Date : 2020-05-06
    Markus Schmitz, Alexander Weber, Oleg Petracic, Markus Waschk, Paul Zakalek, Stefan Mattauch, Alexandros Koutsioubas and Thomas Brückel

    We report on the observation of strain- and magneto-electric coupling in a system consisting of a thin film of ferromagnetic La (1− x ) Sr x MnO 3 (LSMO, x = 0.5 and 0.3) on a ferroelectric BaTiO 3 (BTO) substrate. Pronounced magnetization steps occur at the BTO structural phase transitions. We associate these steps with a strain induced change of the magnetic anisotropy. Temperature dependent magneto-electric

    更新日期:2020-05-06
  • Dynamics and topology of non-Hermitian elastic lattices with non-local feedback control interactions
    New J. Phys. (IF 3.773) Pub Date : 2020-05-03
    Matheus I N Rosa and Massimo Ruzzene

    We investigate non-Hermitian elastic lattices characterized by non-local feedback interactions. In one-dimensional lattices, proportional feedback produces non-reciprocity associated with complex dispersion relations characterized by gain and loss in opposite propagation directions. For non-local controls, such non-reciprocity occurs over multiple frequency bands characterized by opposite non-reciprocal

    更新日期:2020-05-03
  • Capillary assembly of colloidal particles on patterned surfaces
    New J. Phys. (IF 3.773) Pub Date : 2020-05-03
    Mo Zhou, Yanan Liu, Peixin Zhang, Yuting Miao, Hao Luo and Guangyin Jing

    Capillary attraction at the meniscus between tiny objects plays a crucial role in self-assembly processes. The shape of the meniscus governed by the Laplace equation devotes to a long-range attraction distinct to the DLVO defined forces. Rather than considering trapped particles on ideal smooth surfaces, we use patterned substrates with ordered nano-arrays for theoretical modeling toward the capillary

    更新日期:2020-05-03
  • Spin momentum-dependent orbital motion
    New J. Phys. (IF 3.773) Pub Date : 2020-05-03
    Shaohui Yan, Manman Li, Yansheng Liang, Yanan Cai and Baoli Yao

    We present a theoretic analysis on (azimuthal) spin momentum-dependent orbital motion experienced by particles in a circularly-polarized annular focused field. Unlike vortex phase-relevant (azimuthal) orbital momentum flow whose direction is specified by the sign of topological charge, the direction of (azimuthal) spin momentum flow is determined by the product of the field’s polarization ellipticity

    更新日期:2020-05-03
  • ARRAW: anti-resonant reflecting acoustic waveguides
    New J. Phys. (IF 3.773) Pub Date : 2020-05-03
    M K Schmidt, M C O’Brien, M J Steel and C G Poulton

    Development of acoustic and optoacoustic on-chip technologies calls for new solutions to guiding, storing and interfacing acoustic and optical waves in integrated silicon-on-insulator systems. One of the biggest challenges in this field is to suppress the radiative dissipation of the propagating acoustic waves, while co-localizing the optical and acoustic fields in the same region of an integrated

    更新日期:2020-05-03
  • Squeezing-enhanced quantum key distribution over atmospheric channels
    New J. Phys. (IF 3.773) Pub Date : 2020-05-03
    Ivan Derkach, Vladyslav C Usenko and Radim Filip

    We propose the Gaussian continuous-variable quantum key distribution using squeezed states in the composite channels including atmospheric propagation with transmittance fluctuations. We show that adjustments of signal modulation and use of optimal feasible squeezing can be sufficient to significantly overcome the coherent-state protocol and drastically improve the performance of quantum key distribution

    更新日期:2020-05-03
  • Two transitions in spatial modular networks
    New J. Phys. (IF 3.773) Pub Date : 2020-05-03
    Bnaya Gross, Dana Vaknin, Sergey V Buldyrev and Shlomo Havlin

    Understanding the resilience of infrastructures, such as a transportation network, has significant importance for our daily life. Recently, a homogeneous spatial network model was developed for studying spatial embedded networks with characteristic link length such as power-grids and the brain. However, although many real-world networks are spatially embedded and their links have characteristics length

    更新日期:2020-05-03
  • Bistability and oscillations in cooperative microtubule and kinetochore dynamics in the mitotic spindle
    New J. Phys. (IF 3.773) Pub Date : 2020-05-03
    Felix Schwietert and Jan Kierfeld

    In the mitotic spindle microtubules attach to kinetochores via catch bonds during metaphase, and microtubule depolymerization forces give rise to stochastic chromosome oscillations. We investigate the cooperative stochastic microtubule dynamics in spindle models consisting of ensembles of parallel microtubules, which attach to a kinetochore via elastic linkers. We include the dynamic instability of

    更新日期:2020-05-03
  • Trotterized adiabatic quantum simulation and its application to a simple all-optical system
    New J. Phys. (IF 3.773) Pub Date : 2020-04-30
    Yifan Sun, Jun-Yi Zhang, Mark S Byrd and Lian-Ao Wu

    As first proposed for the adiabatic quantum information processing by Wu et al (2002 Phys. Rev. Lett. 89 057904), the Trotterization technique is a very useful tool for universal quantum computing, and in particular, the adiabatic quantum simulation of quantum systems. Given a boson Hamiltonian involving arbitrary bilinear interactions, we propose a static version of this technique to perform an optical

    更新日期:2020-04-30
  • Pseudo-2D superconducting quantum computing circuit for the surface code: proposal and preliminary tests
    New J. Phys. (IF 3.773) Pub Date : 2020-04-21
    Hiroto Mukai, Keiichi Sakata, Simon J Devitt, Rui Wang, Yu Zhou, Yukito Nakajima and Jaw-Shen Tsai

    Among the major hardware platforms for large-scale quantum computing, one of the leading candidates is superconducting quantum circuits. Current proposed architectures for quantum error-correction with the promising surface code require a two-dimensional layout of superconducting qubits with nearest-neighbor interactions. A major hurdle for the scalability in such an architecture using superconducting

    更新日期:2020-04-22
  • Anomalous Hall magnetoresistance in single-crystal Fe(001) films
    New J. Phys. (IF 3.773) Pub Date : 2020-04-21
    M W Jia, J X Li, H R Chen, F L Zeng, X Xiao and Y Z Wu

    The angular-dependent magnetoresistance (MR) in epitaxial Fe(001) films grown on MgO(001) is systematically investigated at room temperature. The resistivities with in-plane magnetic fields parallel ( ρ x ) and transverse ( ρ y ) to a current and a perpendicular field ( ρ z ) show a correlation of ρ z ≈ ρ x > ρ y for Fe film thickness ( d Fe ) between 3 and 50 nm, which is distinctly different from

    更新日期:2020-04-22
  • Site-specific tunnel-ionization in high harmonic generation in molecules
    New J. Phys. (IF 3.773) Pub Date : 2020-04-21
    Laura Rego, Carlos Hernández-García, Antonio Picón and Luis Plaja

    We demonstrate that the standard picture of strong-field tunnel-ionization from molecules should be reformulated. The extended nature of the molecular potential implies the separation of some of the molecular sites from the edge of the ionization barrier. We show that the dependence of the tunnel probability with the distance to the barrier is translated into the ionized wavepacket, modifying substantially

    更新日期:2020-04-22
  • Shaping nonlinear optical response using nonlocal forward Brillouin interactions
    New J. Phys. (IF 3.773) Pub Date : 2020-04-20
    Shai Gertler, Prashanta Kharel, Eric A Kittlaus, Nils T Otterstrom and Peter T Rakich

    In most practical scenarios, optical susceptibilities can be treated as a local property of a medium. For example, in the context of nonlinear optics we can typically treat the Kerr and Raman response as local, such that optical fields at one location do not produce a nonlinear response at distinct locations in space. This is because the electronic and vibrational disturbances produced within the material

    更新日期:2020-04-22
  • Encounter rates between bacteria and small sinking particles
    New J. Phys. (IF 3.773) Pub Date : 2020-04-20
    Jonasz Słomka, Uria Alcolombri, Eleonora Secchi, Roman Stocker and Vicente I Fernandez

    The ecological interaction between bacteria and sinking particles, such as bacterial degradation of marine snow particles, is regulated by their encounters. Current encounter models focus on the diffusive regime, valid for particles larger than the bacterial run length, yet the majority of marine snow particles are small, and the encounter process is then ballistic. Here, we analytically and numerically

    更新日期:2020-04-22
  • Quantum compression of tensor network states
    New J. Phys. (IF 3.773) Pub Date : 2020-04-20
    Ge Bai, Yuxiang Yang and Giulio Chiribella

    We design quantum compression algorithms for parametric families of tensor network states. We first establish an upper bound on the amount of memory needed to store an arbitrary state from a given state family. The bound is determined by the minimum cut of a suitable flow network, and is related to the flow of information from the manifold of parameters that specify the states to the physical systems

    更新日期:2020-04-22
  • Low-cost limit of classical communication with restricted quantum measurements
    New J. Phys. (IF 3.773) Pub Date : 2020-04-13
    Ludwig Kunz, Marcin Jarzyna, Wojciech Zwoliński and Konrad Banaszek

    We consider a communication scenario where classical information is encoded in an ensemble of quantum states that admit a power series expansion in a cost parameter and converge to a single zero cost state with vanishing cost. For a given measurement scheme, we derive an approximate expression for mutual information in the leading order of the cost parameter. The general results are applied to selected

    更新日期:2020-04-22
  • Delocalized information in quantum networks
    New J. Phys. (IF 3.773) Pub Date : 2020-04-13
    J Miguel-Ramiro and W Dür

    We consider entanglement-based quantum networks where information is stored in a delocalized way within regions or the whole network. This offers a natural protection against failure of network nodes, loss and decoherence, and has built-in security features. Quantum information is transmitted within the network by performing local measurements on individual nodes only. Information can be localized

    更新日期:2020-04-22
  • Coherence and catalysis in the Jaynes–Cummings model
    New J. Phys. (IF 3.773) Pub Date : 2020-04-08
    Anette Messinger, Atirach Ritboon, Frances Crimin, Sarah Croke and Stephen M Barnett

    There has been substantial interest of late on the issue of coherence as a resource in quantum thermodynamics. To date, however, analyses have focused on somewhat artificial theoretical models. We seek to bring these ideas closer to experimental investigation by examining the ‘catalytic’ nature of quantum optical coherence. Here the interaction of a coherent state cavity field with a sequence of two-level

    更新日期:2020-04-22
  • Plasmon drag effect with sharp polarity switching
    New J. Phys. (IF 3.773) Pub Date : 2020-04-08
    T Ronurpraful, D Keene and N Noginova

    The generation of significant photocurrents observed in plasmonic metasurfaces is interesting from a fundamental point of view and promising for applications in plasmon-based electronics and plasmonic sensors with compact electrical detection. We show that photoinduced voltages in strongly modulated plasmonic surfaces demonstrate a highly asymmetric angular dependence with polarity switching around

    更新日期:2020-04-22
  • The driven-dissipative Bose–Hubbard dimer: phase diagram and chaos
    New J. Phys. (IF 3.773) Pub Date : 2020-04-08
    Andrus Giraldo, Bernd Krauskopf, Neil G R Broderick, Juan A Levenson and Alejandro M Yacomotti

    We present the phase diagram of the mean-field driven-dissipative Bose–Hubbard dimer model. For a dimer with repulsive on-site interactions ( U > 0) and coherent driving, we prove that ##IMG## [http://ej.iop.org/images/1367-2630/22/4/043009/njpab7539ieqn1.gif] {${{\mathbb{Z}}}_{2}$} -symmetry breaking, via pitchfork bifurcations with sizable extensions of the asymmetric solutions, require a negative

    更新日期:2020-04-13
  • Holding and transferring matter-wave solitons against gravity by spin–orbit-coupling tweezers
    New J. Phys. (IF 3.773) Pub Date : 2020-04-08
    Bin Liu, Rongxuan Zhong, Zhaopin Chen, Xizhou Qin, Honghua Zhong, Yongyao Li and Boris A Malomed

    We consider possibilities to grasp and drag one-dimensional solitons in two-component Bose–Einstein condensates (BECs), under the action of gravity, by tweezers induced by spatially confined spin–orbit (SO) coupling applied to the BEC, with the help of focused laser illumination. Solitons of two types are considered, semi-dipoles and mixed modes. We find critical values of the gravity force, up to

    更新日期:2020-04-13
  • Multi-parameter estimation with multi-mode Ramsey interferometry
    New J. Phys. (IF 3.773) Pub Date : 2020-04-06
    Xinwei Li, Jia-Hao Cao, Qi Liu, Meng Khoon Tey and Li You

    Estimating multiple parameters simultaneously is of great importance to measurement science and application. For a single parameter, atomic Ramsey interferometry (or equivalently optical Mach–Zehnder interferometry) is capable of providing the precision at the standard quantum limit (SQL) using unentangled probe states as input. In such an interferometer, the first beam splitter represented by unitary

    更新日期:2020-04-13
  • Many-body quantum dynamics and induced correlations of Bose polarons
    New J. Phys. (IF 3.773) Pub Date : 2020-04-06
    S I Mistakidis, G M Koutentakis, G C Katsimiga, Th Busch and P Schmelcher

    We study the ground state properties and non-equilibrium dynamics of two spinor bosonic impurities immersed in a one-dimensional bosonic gas upon applying an interspecies interaction quench. For the ground state of two non-interacting impurities we reveal signatures of attractive induced interactions in both cases of attractive or repulsive interspecies interactions, while a weak impurity–impurity

    更新日期:2020-04-13
  • Noise resilience of variational quantum compiling
    New J. Phys. (IF 3.773) Pub Date : 2020-04-05
    Kunal Sharma, Sumeet Khatri, M Cerezo and Patrick J Coles

    Variational hybrid quantum-classical algorithms (VHQCAs) are near-term algorithms that leverage classical optimization to minimize a cost function, which is efficiently evaluated on a quantum computer. Recently VHQCAs have been proposed for quantum compiling, where a target unitary U is compiled into a short-depth gate sequence V . In this work, we report on a surprising form of noise resilience for

    更新日期:2020-04-13
  • Experimental quantification of four-photon indistinguishability
    New J. Phys. (IF 3.773) Pub Date : 2020-04-05
    Taira Giordani, Daniel J Brod, Chiara Esposito, Niko Viggianiello, Marco Romano, Fulvio Flamini, Gonzalo Carvacho, Nicolò Spagnolo, Ernesto F Galvão and Fabio Sciarrino

    Photon indistinguishability plays a fundamental role in information processing, with applications such as linear-optical quantum computation and metrology. It is then necessary to develop appropriate tools to quantify the amount of this resource in a multiparticle scenario. Here we report a four-photon experiment in a linear-optical interferometer designed to simultaneously estimate the degree of

    更新日期:2020-04-13
  • Unsupervised identification of topological phase transitions using predictive models
    New J. Phys. (IF 3.773) Pub Date : 2020-04-05
    Eliska Greplova, Agnes Valenti, Gregor Boschung, Frank Schäfer, Niels Lörch and Sebastian D Huber

    Machine-learning driven models have proven to be powerful tools for the identification of phases of matter. In particular, unsupervised methods hold the promise to help discover new phases of matter without the need for any prior theoretical knowledge. While for phases characterized by a broken symmetry, the use of unsupervised methods has proven to be successful, topological phases without a local

    更新日期:2020-04-13
  • Channel activation of CHSH nonlocality
    New J. Phys. (IF 3.773) Pub Date : 2020-04-05
    Yujie Zhang, Rodrigo Araiza Bravo, Virginia O Lorenz and Eric Chitambar

    Quantum channels that break CHSH nonlocality on all input states are known as CHSH-breaking channels. In quantum networks, such channels are useless for distributing correlations that can violate the CHSH Inequality. Motivated by previous work on activation of nonlocality in quantum states, here we demonstrate an analogous activation of CHSH-breaking channels. That is, we show that certain pairs of

    更新日期:2020-04-13
  • Ambient-pressure high-temperature superconductivity in stoichiometric hydrogen-free covalent compound BSiC 2
    New J. Phys. (IF 3.773) Pub Date : 2020-03-25
    Peng-Jen Chen and Horng-Tay Jeng

    High superconducting critical temperature ( ##IMG## [http://ej.iop.org/images/1367-2630/22/3/033046/njpab76adieqn1.gif] {${T}_{c}$} ) of 73.6 K at ambient pressure is predicted in BSiC 2 by means of the first-principles electron–phonon calculations. Without the need for doping or pressurization, the stoichiometric BSiC 2 exhibits strong electron–phonon coupling (EPC) and highest ##IMG## [http://ej

    更新日期:2020-03-26
  • Effects of surface plasmons on spin currents in a thin film system
    New J. Phys. (IF 3.773) Pub Date : 2020-03-25
    Daigo Oue and Mamoru Matsuo

    We propose and analyze surface-plasmon-driven electron spin currents in a thin metallic film. The electron gas in the metal follows the transversely rotating electric fields of the surface plasmons (SPs), which leads to a static magnetization gradient. We consider herein SPs in a thin-film insulator–metal–insulator structure and solve the spin diffusion equation in the presence of a magnetization gradient

    更新日期:2020-03-26
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