Bulletin of the American Physical Society
54th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 68, Number 7
Monday–Friday, June 5–9, 2023; Spokane, Washington
Session M09: Progress Towards Quantum Memories: Quantum Memory, Networks and State Engineering
2:00 PM–3:48 PM,
Wednesday, June 7, 2023
Room: 206 D
Chair: Philipp Preiss, Max Planck Institute of Quantum Optics
Abstract: M09.00008 : Robust Quantum Memory in a Trapped-Ion Quantum Network Node*
3:24 PM–3:36 PM
Presenter:
Dougal Main
(University of Oxford)
Authors:
Peter Drmota
(University of Oxford)
Dougal Main
(University of Oxford)
David P Nadlinger
(University of Oxford)
Bethan C Nichol
(University of Oxford)
Marius A Weber
(University of Oxford)
Ellis M Ainley
(University of Oxford)
Ayush Agrawal
(University of Oxford)
Raghavendra Srinivas
(University of Oxford)
Gabriel Araneda
(University of Oxford)
Chris J Ballance
(University of Oxford)
David M Lucas
(University of Oxford)
Here, we integrate a long-lived memory qubit into a mixed-species trapped-ion quantum network node [1]. Ion-photon entanglement, first generated with a network qubit in 88Sr+, is transferred to 43Ca+ with 0.977(7) fidelity and mapped to a robust memory qubit. We then entangle the network qubit with another photon, which does not affect the memory qubit. We perform quantum state tomography to show that the fidelity of ion-photon entanglement decays ~ 70 times slower on the memory qubit. Dynamical decoupling and sympathetic cooling further extends the storage time; we measure an ion-photon entanglement fidelity of 0.81(4) after 10 s.
[1] P. Drmota et al., arXiv:2210.11447 (2022)
*This work was supported by the U.K. EPSRC "Quantum Computing and Simulation" Hub, the E.U. Quantum Technology Flagship Project AQTION (No. 820495), and the U.S. Army Research Office (ref. W911NF-18-1-0340).
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