Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session K53: Novel Qubit-Qubit Coupling Approaches
3:00 PM–5:24 PM,
Tuesday, March 5, 2024
Room: 202AB
Sponsoring
Units:
DQI DCMP
Chair: Andrew Cleland, University of Chicago
Abstract: K53.00003 : Interfacing Gottesman-Kitaev-Preskill Qubits to Quantum Memories*
3:24 PM–3:36 PM
Presenter:
Prajit Dhara
(The University of Arizona)
Authors:
Prajit Dhara
(The University of Arizona)
Liang Jiang
(University of Chicago)
Saikat Guha
(University of Arizona)
Gottesman-Kitaev-Preskill (GKP) states have been demonstrated to pose significant advantages when utilized for fault-tolerant all-optical quantum computing and quantum communications links. However, interfacing these systems with long-lived solid-state quantum memories has remained an open problem. We propose an interface between quantum memories and GKP qubit states based on a cavity interaction-mediated controlled displacement gate. We characterize the quality of memory-GKP entanglement as a function of cavity parameters, suggesting optimal operation regimes for high-quality state transfer between either qubit states. We extend this protocol for creating GKP cluster states by avoiding the requirement of ancillary optical quadrature-squeezed light. Utilizing post-selected entanglement swapping operations for GKP qubits, we demonstrate the utility of our protocol for near-deterministic entanglement generation between quantum memories over low-loss quantum links. Extensions and derivatives of our proposal could enable various applications by utilizing the operational trade-offs for qubits encoded in memory and in the GKP basis.
*The authors acknowledge National Science Foundation (NSF) and Department of Energy (DoE) for Engineering Research Center for Quantum Networks (CQN), awarded under cooperative agreement number 1941583. L.J. acknowledges support from the ARO (W911NF-23-1-0077), ARO MURI (W911NF-21-1-0325), AFOSR MURI (FA9550-19-1-0399, FA9550-21-1-0209), NSF (OMA-1936118, OMA-2137642), NTT Research, Packard Foundation (2020-71479), and the Marshall and Arlene Bennett Family Research Program.
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