The Duan-Kimble cavity-atom quantum memory loading scheme revisited

• URL: http://arxiv.org/abs/2406.12201v1
• Date: Tue, 18 Jun 2024 01:58:10 GMT
• Title: The Duan-Kimble cavity-atom quantum memory loading scheme revisited
• Authors: Michael G. Raymer, Clark Embleton, Jeffrey H. Shapiro,
• Abstract summary: We reexamine the well-known Duan-Kimble entanglement scheme. A single-photon qubit is entangled with a quantum memory consisting of a single-atom qubit in a strongly coupled optical cavity.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We reexamine the well-known Duan-Kimble entanglement scheme, wherein the state of a single-photon qubit is entangled with a quantum memory consisting of a single-atom qubit in a strongly coupled optical cavity, providing the capability to load the photon's state into the memory. We correct a common error appearing in some subsequent papers regarding the validity of the single-photon reflectivity function that characterizes the essential phase shift at the heart of the protocol. Using the validated analytical solution, we introduce an improved scheme-the push-pull configuration-where the photon and cavity are tuned at the midpoint between atomic resonances and show that it can outperform the original on-off configuration in which the photon and cavity are tuned exactly to one of the atomic resonances. The performance metric used is the final memory-state fidelity versus the heralding probability, which determines the memory loading rate. The results should play a role in optimizing future quantum repeater schemes based on the Duan-Kimble protocol.

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