Abstract
We report results of a ground-state entanglement protocol for a pair of Cs atoms separated by 6 μm, combining the Rydberg blockade mechanism with a two-photon Raman transition to prepare the Bell state with a loss-corrected fidelity of 0.81(5), equal to the best demonstrated fidelity for atoms trapped in optical tweezers but without the requirement for dynamically adjustable interatomic spacing. Qubit state coherence is also critical for quantum information applications, and we characterise both ground-state and ground-Rydberg dephasing rates using Ramsey spectroscopy. We demonstrate transverse dephasing times ms and s for the qubit levels and achieve long ground-Rydberg coherence times of as required for implementing high-fidelity multi-qubit gate sequences where a control atom remains in the Rydberg state while applying local operations on neighbouring target qubits.
Highlights
December 2018Original content from this Abstract work may be used under We report results of a ground-state entanglement protocol for a pair of Cs atoms separated by 6 μm, the terms of the Creative
Neutral atoms are ideal candidates for quantum information processing, offering long coherence times as a quantum memory and ease of scaling to large numbers of qubits [1, 2]
Controllable long-range interactions can be engineered between the qubits by coupling to highly-excited Rydberg states which have extremely large dipole-moments, giving rise to a phenomenon known as dipole blockade [3,4,5] whereby only a single Rydberg excitation can be created for atoms separated by R 10 μm
Summary
Original content from this Abstract work may be used under We report results of a ground-state entanglement protocol for a pair of Cs atoms separated by 6 μm, the terms of the Creative. Qubit state coherence is critical for quantum the work, journal citation information applications, and we characterise both ground-state and ground-Rydberg dephasing and DOI. T2¢ = 0.14(1) s for the qubit levels and achieve long ground-Rydberg coherence times of. T2* = 17(2) ms as required for implementing high-fidelity multi-qubit gate sequences where a control atom remains in the Rydberg state while applying local operations on neighbouring target qubits
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