Optical-density-enhanced squeezed-light generation without optical cavities

You-Lin Chuang, Ray-Kuang Lee, and Ite A. Yu
Phys. Rev. A 96, 053818 – Published 8 November 2017

Abstract

To achieve a high degree of quantum noise squeezing, an optical cavity is often employed to enhance the interaction time between light and matter. Here, we propose to utilize the effect of coherent population trapping (CPT) to directly generate squeezed light without any optical cavity. Combined with the slow propagation speed of light in a CPT medium, a coherent state passing through an atomic ensemble with a high optical density (OD) can evolve into a highly squeezed state even in a single passage. Our study reveals that noise squeezing of more than 10 dB can be achieved with an OD of 1000, which is currently available in experiments. A larger OD can further increase the degree of squeezing. As the light intensity and two-photon detuning are key factors in the CPT interaction, we also demonstrate that the minimum variance at a given OD can be reached for a wide range of these two factors, showing the proposed scheme is flexible and robust. Furthermore, there is no need to consider the phase-matching condition in the CPT scheme. Our introduction of high OD in atomic media not only brings a long light-matter interaction time comparable to optical cavities, but also opens an alternative avenue in the generation of squeezed light for quantum interface.

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  • Received 29 March 2017

DOI:https://doi.org/10.1103/PhysRevA.96.053818

©2017 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

You-Lin Chuang1,2, Ray-Kuang Lee1,2,3,4,*, and Ite A. Yu3,4,†

  • 1Physics Division, National Center for Theoretical Sciences, Hsinchu 30013, Taiwan
  • 2Institute of Photonics Technologies, National Tsing Hua University, Hsinchu 30013, Taiwan
  • 3Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan
  • 4Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing Hua University, Hsinchu 30013, Taiwan

  • *rklee@ee.nthu.edu.tw
  • yu@phys.nthu.edu.tw

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Issue

Vol. 96, Iss. 5 — November 2017

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