Coherent-feedback-enhanced nonreciprocal entanglement via directional optical parametric amplification

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Abstract
Nonreciprocity is a key ingredient for realizing chiral quantum networks. We propose a scheme to achieve the nonreciprocal enhancement of bipartite and tripartite entanglement in a hybrid cavity optomechanical (COM) system comprising a χ (2) nonlinear resonator, an atomic ensemble, and a coherent feedback loop. The phase-matching condition of the χ (2) nonlinear crystal confines the OPA-induced directional squeezing to the counterclockwise (CCW) mode, resulting in nonreciprocal quantum entanglement. We find that the synergistic interplay between directional squeezing and coherent feedback not only enhances the nonreciprocal bipartite and tripartite entanglement, but also substantially improves its dissipation tolerance. Our results demonstrate an alternative mechanism for generating and manipulating nonreciprocal quantum correlations in stationary optomechanical platforms. These findings open a promising avenue for quantum information processing, offering a robust platform for the development of nonreciprocal quantum devices.
Funding Information
  • National Natural Science Foundation of China (62101479)
  • National Natural Science Foundation of China (62475226)
  • National Natural Science Foundation of China (12375020)
  • Young Talents Support Project of the Association of Science and Technology of Jilin Province (QT202425)
  • Natural Science Foundation of Jilin Province (20240101013JC)
  • Department of Education Research Project of Jilin Province (JJKH20262172BS)
  • the Doctoral Candidate Support Program of the Association of Science and Technology of Jilin Province (BST202527)

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