个人简介

2013 Kavli Fellow 2009-2010 Blanchard Assistant Professor of Chemistry 1998-2003 John and Fannie Hertz Fellow 2001 Institute for Theoretical Physics Graduate Fellow, UC-Santa Barbara 1997 Barry Goldwater Scholar

研究领域

Characterization/Multiscale Theory and Simulation/Physical Chemistry/Planetary Science and Astrobiology/Spectroscopy and Dynamics/Theoretical Chemistry/Theory and Modeling

Quantum information is an exciting field that employs quantum mechanical systems to solve problems in computation and communication. The Brown Group uses the experimental and theoretical techniques of quantum information to address challenges in physical chemistry. The basis of our experimental work is a collection of laser cooled ions trapped in a quadrupole ion trap. The theoretical work focuses on understanding the boundary between classical and quantum algorithms for calculating material properties. Quantum Control and Quantum Error Correction: The central challenge of realizing the benefits of a quantum information device is the reduction of errors in the quantum systems. The Brown lab approaches this problem at both the physical level of the system and environment and the more abstract level of codes and operators. We construct and study quantum control techniques such as composite pulse sequences and dynamic decoupling. We are also comparing the properties of quantum error correction codes when mapped to realistic physical devices and developing new methods for generating codes. Surface Electrode Ion Traps: Working with collaborators at Sandia and GTRI, we are building quantum information devices using surface electrode ion traps. These surface electrode ion traps are microfabricated allowing us to construct a networked collection of micron-scale ion traps with built-in functionality for ion control and measurement. Cold Molecular Ions: The reaction dynamics of molecules at millikelvin temperatures exhibit interesting quantum mechanical effects that are typically hidden by thermal averaging. However, preparing molecules at millikelvin temperatures and then accurately measuring reaction products has been a long-standing challenge for physical chemists. The Brown Group is developing a technique that uses atomic ions to cool and measure molecular ions. This technique will allow for the detection of weak molecular transitions by atomic fluorescence which will be useful for fundamental studies of chemical reactions.

近期论文

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Sympathetic cooling of molecular ion motion to the ground state, R. Rugango, J. E. Goeders, T. H. Dixon, J. M. Gray, N. Khanyile, G. Shu, R. J. Clark, and K. R. Brown, arXiv:1412.0782 (2014) Comparison of a quantum error correction threshold for exact and approximate errors, M. Gutiérrez and K. R. Brown, Phys. Rev. A 91, 022335 (2015) Magic state distillation and gate compilation in quantum algorithms for quantum chemistry, C. J. Trout and K. R. Brown, International Journal of Quantum Chemistry, early view, arxiv:1501.01298 (2015) Compiler management of communication and parallelism for quantum computation , J. Heckey, A. JavadAbhari, S. Patil, D. Kudrow, K. R. Brown, D. Franklin, F. T. Chong, and M. Martonosi, to appear in the Proceedings of the 20th International Conference on Architectural Support for Programming Languages and Operating Systems (ASPLOS 2015) (2015) Low-distance surface codes under realistic quantum noise, Y. Tomita and K. Svore, Phys. Rev. A, 90, 062320 (2014) Transformed composite sequences for improved qubit addressing, J. T. Merrill, S. C. Doret, G. Vittorini, J. P. Addison, and K. R. Brown, Phys. Rev. A 90, 040301(R) (2014) Robustness of composite pulses to time-dependent control noise, C. Kabytayev, T. J. Green, K. Khodjasteh, M. J. Biercuk, L. Viola, and K. R. Brown, Phys. Rev. A 90, 012316 (2014) Heating rates and ion-motion control in a Y-junction surface-electrode trap, G. Shu, G. Vittorini, C. Volin, A. Buikema, C. S. Nichols, D. Stick, and K. R. Brown, Phys. Rev. A 89, 062308 (2014) Large scale modular quantum computer architecture with atomic memory and photonic interconnects, C. Monroe, R. Raussendorf, A. Ruthven, K. R. Brown, P. Maunz, L.-M. Duan, and J. Kim, Phys. Rev. A 89, 022317 (2014) Comparison of ancilla preparation and measurement procedures for the Steane [[7,1,3]] code on a model ion trap quantum computer, Y. Tomita, M. Gutiérrez, C. Kabytayev, K. R. Brown, M. R. Hutsel, A. P. Morris, K. E. Stevens, and G. Mohler, Phys. Rev. A 88, 042336 (2013) Spatially uniform single-qubit gate operations with near-field microwaves and composite pulse compensation, C. M. Shappert, J. T. Merrill, K. R. Brown, J. M. Amini, C. Volin, S. C. Doret, H. Hayden, C.-S. Pai, K. R. Brown, and A. W. Harter, New J. Phys. 15 083053 (2013) Quantum rotations: A case study in static and dynamic machine-code generation for quantum computers , D. Kudrow, K. Bier, Z.-x. Deng, D. Franklin, Y. Tomita, K. R. Brown, and F. T. Chong, in Proceedings of 40th Annual International Symposium on Computer Architecture (ISCA 2013), 166-176 (2013) Identifying single molecular ions by resolved sideband measurements, J. E. Goeders, C. R. Clark, G. Vittorini, K. Wright, C. R. Viteri, and K. R. Brown, J. Phys. Chem. A. 117, 9725 (2013) Modular cryostat for ion trapping with surface-electrode ion traps, G. Vittorini, K. Wright, K. R. Brown, A. W. Harter, and S. C. Doret, Rev. Sci. Inst. 84, 043221 (2013) journal Progress in compensating pulse sequences for quantum computation, J. T. Merrill, and K. R. Brown, Quantum Information and Computation for Chemistry: Advances in Chemical Physics 154, 241 (2014) arXiv:1203.6392 Approximation of realistic error channels by Clifford channels and Pauli measurements, M. Gutiérrez, L. Svec, A. Vargo, and K. R. Brown, Phys. Rev. A. 87, 030302(R) (2013) Topological subsystem codes from graphs and hypergraphs, P. Sarvepalli, and K. R. Brown, Phys. Rev. A 86, 042336 (2012) Nonthreshold quantum secret-sharing schemes in the graph-state formalism, P. Sarvepalli, Phys. Rev. A 86, 042303 (2012) Demonstration of integrated microscale optics in surface-electrode ion traps, J. T. Merrill, C. Volin, D. Landgren, J. M. Amini, K. Wright, S. C. Doret, C-S. Pai, H. Hayden, T. Killian, D. Faircloth, K. R. Brown, A. W. Harter, and R. E. Slusher, New J. Phys. 13, 103005 (2011) Challenges of laser-cooling molecular ions, J. H. V. Nguyen, C. R. Viteri, E. G. Hohenstein, C. D. Sherrill, K. R. Brown, and B. Odom, New J. Phys. 13, 063023 (2011)