Robust quantum logic in neutral atoms via adiabatic Rydberg dressing

Abstract

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 ${\sigma }_{+}/{\sigma }_{-}$ 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. For reasonable parameters, with qubits encoded into the clock states of ${}^{133}$Cs, we predict that our protocol could produce a CZ gate in $<10$ $\mu$s with error probability on the order of $10^{-3}$.

9 pages, 5 figures

References in corpus (3)

• Evidence for coherent collective Rydberg excitation in the strong blockade regime
• Quantum gates and multi-particle entanglement by Rydberg excitation blockade and adiabatic passage
• Deterministic entanglement of two neutral atoms via Rydberg blockade

Cited by in corpus (7)

• Transverse-Field Ising Dynamics in a Rydberg-Dressed Atomic Gas
• Rydberg-atom-based scheme of nonadiabatic geometric quantum computation
• Resilient quantum gates on periodically driven Rydberg atoms
• Photon recoil and laser focusing limits to Rydberg gate fidelity
• Doppler-resilient ground-Rydberg transition and its application in high-fidelity entangling gates with neutral atoms
• One-step implementation of Toffoli gate for neutral atoms based on unconventional Rydberg pumping
• Decoherence in excited atoms by low-energy scattering