Elimination of noise in optically rephased photon echoes

You-Zhi Ma, Ming Jin, Duo-Lun Chen, Zong-Quan Zhou (), Chuan-Feng Li () and Guang-Can Guo
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You-Zhi Ma: University of Science and Technology of China
Ming Jin: University of Science and Technology of China
Duo-Lun Chen: University of Science and Technology of China
Zong-Quan Zhou: University of Science and Technology of China
Chuan-Feng Li: University of Science and Technology of China
Guang-Can Guo: University of Science and Technology of China

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: 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+:Y2SiO5 crystal to serve as an optical quantum memory. A storage fidelity of 0.952 ± 0.018 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.

Date: 2021
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DOI: 10.1038/s41467-021-24679-4

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