Open AccessImproving few-photon optomechanical effects with coherent feedback
Author(s) -
Yongqing Wei,
Xiaojuan Wang,
Biao Xiong,
Chengsong Zhao,
Jibing Liu,
Chuan-Jia Shan
Publication year - 2021
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.440382
Subject(s) - physics , photon , feedback loop , optics , correlation function (quantum field theory) , quantum tunnelling , coupling (piping) , coherent states , quantum mechanics , quantum , computer science , materials science , computer security , dielectric , metallurgy
Few-photon effects such as photon blockade and tunneling have potential applications in modern quantum technology. To enhance the few-photon effects in an optomechanical system, we introduce a coherent feedback loop to cavity mode theoretically. By studying the second-order correlation function, we show that the photon blockade effect can be improved with feedback. Under appropriate parameters, the photon blockade effect exists even when cavity decay rate is larger than the single-photon optomechanical coupling coefficient, which may reduce the difficulty of realizing single-photon source in experiments. Through further study of the third-order correlation function, we show that the tunneling effect can also be enhanced by feedback. In addition, we discuss the application of feedback on Schrödinger-cat state generation in an optomechanical system. The result shows that the fidelity of cat state generation can be improved in the presence of feedback loop.