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Title: Robust quantum logic in neutral atoms via adiabatic Rydberg dressing

Journal Article · · Physical Review A - Atomic, Molecular, and Optical Physics
 [1];  [2];  [2];  [2];  [2];  [2]
  1. Univ. of New Mexico, Albuquerque, NM (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

We study a scheme for implementing a controlled-Z (CZ) gate between two neutral-atom qubits based on the Rydberg blockade mechanism in a manner that is robust to errors caused by atomic motion. By employing adiabatic dressing of the ground electronic state, we can protect the gate from decoherence due to random phase errors that typically arise because of atomic thermal motion. In addition, the adiabatic protocol allows for a Doppler-free configuration that involves counterpropagating lasers in a σ+- orthogonal polarization geometry that further reduces motional errors due to Doppler shifts. The residual motional error is dominated by dipole-dipole forces acting on doubly-excited Rydberg atoms when the blockade is imperfect. As a result, for reasonable parameters, with qubits encoded into the clock states of 133Cs, we predict that our protocol could produce a CZ gate in < 10 μs with error probability on the order of 10-3.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1184595
Alternate ID(s):
OSTI ID: 1180922
Report Number(s):
SAND-2014-19986J; PLRAAN; 547250
Journal Information:
Physical Review A - Atomic, Molecular, and Optical Physics, Vol. 91, Issue 1; ISSN 1050-2947
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 48 works
Citation information provided by
Web of Science

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Rydberg state mediated quantum gates and entanglement of pairs of neutral atoms text January 2010
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Cited By (18)

Entangling atomic spins with a Rydberg-dressed spin-flip blockade journal October 2015
Experimental investigations of dipole–dipole interactions between a few Rydberg atoms journal June 2016
Quantum computing with atomic qubits and Rydberg interactions: progress and challenges journal October 2016
Discrete time crystal in a finite chain of Rydberg atoms without disorder journal January 2020
Population transfer and quantum entanglement implemented in cold atoms involving two Rydberg states via an adiabatic passage journal December 2015
Fast Rydberg antiblockade regime and its applications in quantum logic gates journal February 2017
Applications of the modified Rydberg antiblockade regime with simultaneous driving journal October 2017
Nonadiabatic holonomic quantum computation using Rydberg blockade journal April 2018
One-step construction of the multiple-qubit Rydberg controlled-phase gate journal September 2018
Suppressing Motional Dephasing of Ground-Rydberg Transition for High-Fidelity Quantum Control with Neutral Atoms journal February 2020
Controlled Phase Gate Protocol for Neutral Atoms via Off-Resonant Modulated Driving journal February 2020
Observation of a large, resonant, cross-Kerr nonlinearity in a cold Rydberg gas journal December 2019
Single-qubit gates based on targeted phase shifts in a 3D neutral atom array journal June 2016
Rydberg-atom-based controlled arbitrary-phase gate and its applications journal January 2019
Tunable cw UV laser with <35 kHz absolute frequency instability for precision spectroscopy of Sr Rydberg states journal January 2016
Quantum computing with atomic qubits and Rydberg interactions: Progress and challenges text January 2016
Suppress motional dephasing of ground-Rydberg transition for high-fidelity quantum control with neutral atoms text January 2019
Transverse-Field Ising Dynamics in a Rydberg-Dressed Atomic Gas text January 2019

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