Quantum gates with weak van der Waals interactions of neutral Rydberg atoms

Xiao-Feng Shi and Yan Lu
Phys. Rev. A 104, 012615 – Published 26 July 2021

Abstract

Neutral atoms are promising for large-scale quantum computing, but accurate neutral-atom entanglement depends on large Rydberg interactions which strongly limit the interatomic distances. Via a phase accumulation in detuned Rabi cycles enabled by a Rydberg interaction of similar magnitude to the Rydberg Rabi frequency, we study a controlled-phase gate with an arbitrary phase and extend it to the controlled-not gate. The gates need only three steps for coupling one Rydberg state, depend on an easily accessible van der Waals interaction that naturally arises between distant atoms, and have no rotation error in the weak interaction regime. Importantly, they can work with very weak interactions so that well-separated qubits can be entangled. The gates are sensitive to the irremovable fluctuation of Rydberg interactions, but can still have a fidelity over 98% with realistic position fluctuation of qubits separated over 20 μm.

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  • Received 17 February 2021
  • Revised 18 April 2021
  • Accepted 14 July 2021

DOI:https://doi.org/10.1103/PhysRevA.104.012615

©2021 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & OpticalQuantum Information, Science & Technology

Authors & Affiliations

Xiao-Feng Shi and Yan Lu

  • School of Physics and Optoelectronic Engineering, Xidian University, Xi'an 710071, China

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Issue

Vol. 104, Iss. 1 — July 2021

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