Elimination of Noise in Optically Rephased Photon Echoes

• URL: http://arxiv.org/abs/2107.09857v1
• Date: Wed, 21 Jul 2021 02:55:09 GMT
• Title: Elimination of Noise in Optically Rephased Photon Echoes
• Authors: You-Zhi Ma, Ming Jin, Duo-Lun Chen, Zong-Quan Zhou, Chuan-Feng Li, Guang-Can Guo
• Abstract summary: We propose a noiseless photon-echo protocol based on a four-level atomic system. A storage fidelity of 0.952 is obtained for time-bin qubits encoded with single-photon-level coherent pulses.
• Score: 1.5729386263718377
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Photon echo is a fundamental tool for the manipulation of electromagnetic fields. Unavoidable spontaneous emission noise is generated in this process due to the strong rephasing pulse, which limits the achievable signal-to-noise ratio and represents a fundamental obstacle towards their applications in the quantum regime. Here we propose a noiseless photon-echo protocol based on a four-level atomic system. We implement this protocol in a Eu3+:Y2SiO5bcrystal to serve as an optical quantum memory. A storage fidelity of 0.952 is obtained for time-bin qubits encoded with single-photon-level coherent pulses, which is far beyond the maximal fidelity achievable using the classical measure-and-prepare strategy. In this work, the demonstrated noiseless photon-echo quantum memory features spin-wave storage, easy operation and high storage fidelity, which should be easily extended to other physical systems.

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