Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Optics Express

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

Xiaohan Li, Xuan Ma, Rui Hou, Jehyung Kim, Xue Han, Hong-Fu Wang, Shou Zhang

Published Oct 30, 2026• 0 citations
Publisher
DOI
10.1364/oe.616447

Related papers

Remote nonreciprocal optical-microwave entanglement and one-way steering via parametric amplification

Kai‐Wei Huang, Yi Ren, Hao Zhai +1 more

Physical Review A•Jun 1, 2026•0 citations

Entanglement enhancement from coherent feedback-controlled and cascaded nondegenerate optical parametric amplifiers

Yashuai Han, Zhao Zhang, Ju Qu +1 more

Optics Communications•Aug 6, 2022•7 citations

Entanglement Enhancement in an Electro-Optomechanical System via an Auxiliary Cavity and Optical Parametric Amplification

Fouad Essaadi, Yassine Oussarhan, F. Omari +5 more

International Journal of Theoretical Physics•Apr 21, 2026•1 citation

Coherent control of optomechanical entanglement and steering via dual parametric amplification

Jinhao Jia, Yingru Li, Ran Liang +1 more

We propose a coherent control scheme for engineering quantum correlations in a cavity optomechanical (COM) system consisting of a driven optical cavity with an embedded nonlinear medium and a membrane, assisted by a coherent feedback loop. The nonlinear medium and the membrane are pumped to implement optical and mechanical parametric amplifications with controllable modulation frequencies and pump amplitudes. Within the stable regime identified by Floquet analysis, the feedback-induced enhancement of optomechanical entanglement persists when the period-averaged mean-field intracavity photon number is matched, showing that the enhancement cannot be attributed simply to an increase in this quantity. A systematic comparison of the four configurations further reveals a nonadditive interplay between dual parametric amplification and coherent feedback. Varying the amplitude reflectivity of the beam splitter and the feedback loop phase enables effective control of optomechanical entanglement and directional EPR steering, including a transition from one-way to two-way steering. The combined scheme also improves the robustness of both correlations against thermal noise, providing a potential route toward robust quantum-state engineering in COM systems.

quant-pharXiv:2604.15162•Physical Review A•Apr 17, 2026•0 citations

Simultaneous nonreciprocal photon blockade via directional parametric amplification

Wei Zhang, Rui Hou, Tie Wang +3 more

We propose a scheme to achieve the simultaneous nonreciprocal photon blockade of two microring resonators in an all-optical system without any rotating parts. By unidirectionally parametrically pumping a ${\ensuremath{\chi}}^{(2)}$-nonlinear resonator with a classical coherent field, the counterclockwise mode in the resonator is exposed to the parametric amplification process when a forward signal field is input in another resonator, but not the case for a backward signal field. This leads to different quantum interference effects among distinct excitation paths for two optical modes, which is the essential reason for simultaneous nonreciprocal photon blockade. We analytically give the optimal parameter conditions to achieve simultaneous strong photon blockade with the parametric amplification. Furthermore, the nonreciprocity is simultaneously enhanced through tuning the amplitude of input signal. Our work provides an avenue to realize simultaneous nonreciprocal single-photon devices without moving parts and may have potential applications in many-body quantum information processing and quantum communication.

Physical Review A•Aug 22, 2024•22 citations

Entanglement enhancement with cascaded nondegenerate optical parametric amplifier

Jia Jia, Yan, Duan Duan +2 more

Conference on Lasers and Electro-Optics•Jan 1, 2012•0 citations
We propose a coherent control scheme for engineering quantum correlations in a cavity optomechanical (COM) system consisting of a driven optical cavity with an embedded nonlinear medium and a membrane, assisted by a coherent feedback loop. The nonlinear medium and the membrane are pumped to implement optical and mechanical parametric amplifications with controllable modulation frequencies and pump amplitudes. Within the stable regime identified by Floquet analysis, the feedback-induced enhancement of optomechanical entanglement persists when the period-averaged mean-field intracavity photon number is matched, showing that the enhancement cannot be attributed simply to an increase in this quantity. A systematic comparison of the four configurations further reveals a nonadditive interplay between dual parametric amplification and coherent feedback. Varying the amplitude reflectivity of the beam splitter and the feedback loop phase enables effective control of optomechanical entanglement and directional EPR steering, including a transition from one-way to two-way steering. The combined scheme also improves the robustness of both correlations against thermal noise, providing a potential route toward robust quantum-state engineering in COM systems.
We propose a scheme to achieve the simultaneous nonreciprocal photon blockade of two microring resonators in an all-optical system without any rotating parts. By unidirectionally parametrically pumping a ${\ensuremath{\chi}}^{(2)}$-nonlinear resonator with a classical coherent field, the counterclockwise mode in the resonator is exposed to the parametric amplification process when a forward signal field is input in another resonator, but not the case for a backward signal field. This leads to different quantum interference effects among distinct excitation paths for two optical modes, which is the essential reason for simultaneous nonreciprocal photon blockade. We analytically give the optimal parameter conditions to achieve simultaneous strong photon blockade with the parametric amplification. Furthermore, the nonreciprocity is simultaneously enhanced through tuning the amplitude of input signal. Our work provides an avenue to realize simultaneous nonreciprocal single-photon devices without moving parts and may have potential applications in many-body quantum information processing and quantum communication.