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Multichannel nonreciprocal amplifications using cesium vapor

Yao-Dong Hu1 and Guo-Qiang Zhang1,2

  • 1Interdisciplinary Center of Quantum Information, State Key Laboratory of Modern Optical Instrumentation, and Zhejiang Province Key Laboratory of Quantum Technology and Device, School of Physics, Zhejiang University, Hangzhou 310027, China
  • 2School of Physics, Hangzhou Normal University, Hangzhou, Zhejiang 311121, China

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Phys. Rev. A 107, 053716 – Published 31 May, 2023

DOI: https://doi.org/10.1103/PhysRevA.107.053716

Abstract

Multichannel synchronous amplifications are an inevitable key problem in quantum communication process, which can broaden the bandwidth of transmitted signals and establish correlation among different optical channels. Here we study a nonreciprocal system with four concurrent amplification channels using hot cesium atoms, both theoretically and experimentally. For the forward probe field, the double–electromagnetically induced transparency structure is formed and the phase-matching condition of the multiwave mixing process is satisfied, which are both destroyed when the probe field is reversed. In addition, the four-channel nonreciprocal amplifications are formed in the Zeeman sublevels of the system with special selection of light field polarization, which will also dramatically enhance the signal-to-noise ratio by suppressing the spontaneous emission noise of the system. In our experiment, the quadruple nonreciprocal amplifications are achieved with the maximum forward gain reaching 30 dB and the reverse suppression reaching–23 dB. The gain adjustability allows the construction of a gain-loss balanced system, providing a scheme for an atomic system to engineer a parity-time-symmetric (or -antisymmetric) structure.

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Phys. Rev. A 107, 053716– Published 31 May, 2023
  • Received 13 December 2022
  • Revised 4 April 2023
  • Accepted 17 May 2023
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