Entanglement of neutral-atom qubits with long ground-Rydberg coherence times

Picken, C J and Legaie, R and McDonnell, K and Pritchard, J D (2018) Entanglement of neutral-atom qubits with long ground-Rydberg coherence times. Quantum Science and Technology, 4 (1). 015011. (https://doi.org/10.1088/2058-9565/aaf019)

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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 transitions to prepare the |Ψ+⟩=(|10⟩+|01⟩)/2‾√ 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 T∗2=10(1)~ms and T′2=0.14(1)~s for the qubit levels and achieve long ground-Rydberg coherence times of T∗2=17(2) μs 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.

ORCID iDs

Picken, C J ORCID logoORCID: https://orcid.org/0000-0002-7194-8398, Legaie, R ORCID logoORCID: https://orcid.org/0000-0002-7141-8338, McDonnell, K and Pritchard, J D ORCID logoORCID: https://orcid.org/0000-0003-2172-7340;
  • Item type:Article
    ID code:66084
    Dates:
    Date
    Event
    3 December 2018
    Published
    12 November 2018
    Published Online
    12 November 2018
    Accepted
    14 August 2018
    Submitted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:13 Nov 2018 12:00
    Last modified:11 Nov 2024 12:08
    URI:https://strathprints.strath.ac.uk/id/eprint/66084
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