Interfacing Gottesman-Kitaev-Preskill Qubits to Quantum Memories

• URL: http://arxiv.org/abs/2406.04275v2
• Date: Fri, 18 Oct 2024 00:21:02 GMT
• Title: Interfacing Gottesman-Kitaev-Preskill Qubits to Quantum Memories
• Authors: Prajit Dhara, Liang Jiang, Saikat Guha,
• Abstract summary: We propose an interface between quantum memories and GKP qubit states based on a cavity-mediated controlled displacement gate. We extend this protocol to demonstrate the creation of GKP cluster states by avoiding the requirement of ancillary optical quadrature-squeezed light.
• Score: 3.152708951218456
• License:
• Abstract: Gottesman-Kitaev-Preskill (GKP) states have been demonstrated to pose significant advantages when utilized for fault-tolerant all optical continuous-variable quantum computing as well as for quantum communications links for entanglement distribution. However interfacing these systems to long-lived solid-state quantum memories has remained an open problem. Here we propose an interface between quantum memories and GKP qubit states based on a cavity-mediated controlled displacement gate. We characterize the quality of memory-GKP entanglement as a function of cavity parameters suggesting optimal regimes of operation for high-quality state transfer between either qubit states. We further extend this protocol to demonstrate the creation of 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 high-rate entanglement generation between quantum memories. Extensions and derivatives of our proposal could enable a wide variety of applications by utilizing the operational trade-offs for qubits encoded in memory and in the GKP basis.

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