Long-lived Bell states in an array of optical clock qubits

Schine, Nathan; Young, Aaron; Eckner, William; Martin, Michael Joseph; Kaufman, Adam

doi:10.1038/s41567-022-01678-w

Long-lived Bell states in an array of optical clock qubits

Journal Article · Mon Aug 08 00:00:00 EDT 2022 · Nature Physics

DOI:https://doi.org/10.1038/s41567-022-01678-w· OSTI ID:2426749

Schine, Nathan ^[1]; Young, Aaron ^[1]; Eckner, William ^[1]; ^[2]; Kaufman, Adam ^[1]

Univ. of Colorado, Boulder, CO (United States); National Inst. of Standards and Technology (NIST), Boulder, CO (United States). JILA
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

The generation of long-lived entanglement in optical atomic clocks is one of the main goals of quantum metrology. Arrays of neutral atoms, where Rydberg-based interactions may generate entanglement between individually controlled and resolved atoms, constitute a promising quantum platform to achieve this. Here we leverage the programmable state preparation afforded by optical tweezers and the efficient strong confinement of a three-dimensional optical lattice to prepare an ensemble of strontium-atom pairs in their motional ground state. We engineer global single-qubit gates on the optical clock transition and two-qubit entangling gates via adiabatic Rydberg dressing, enabling the generation of Bell states with a state-preparation-and-measurement-corrected fidelity of 92.8(2.0)% (87.1(1.6)% without state-preparation-and-measurement correction). For use in quantum metrology, it is furthermore critical that the resulting entanglement be long lived; we find that the coherence of the Bell state has a lifetime of 4.2(6) s via parity correlations and simultaneous comparisons between entangled and unentangled ensembles. Such long-lived Bell states can be useful for enhancing metrological stability and bandwidth. In the future, atomic rearrangement will enable the implementation of many-qubit gates and cluster state generation, as well as explorations of the transverse field Ising model.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 2426749

Report Number(s):: LA-UR--21-29502

Journal Information:: Nature Physics, Journal Name: Nature Physics Journal Issue: 9 Vol. 18; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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