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

C J Picken, R Legaie, K McDonnell, J D Pritchard

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60 Citations (Scopus)
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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.
Original languageEnglish
Article number015011
Number of pages8
JournalQuantum Science and Technology
Issue number1
Early online date12 Nov 2018
Publication statusPublished - 3 Dec 2018


  • Ryberg atoms
  • entanglement
  • quantum computing
  • dipole blockade


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