Realization of Nonlinear Optical Nonreciprocity on a Few-Photon Level Based on Atoms Strongly Coupled to an Asymmetric Cavity.
Pengfei Yang,Xiuwen Xia,Hai He,Shaokang Li,Xing Han,Peng Zhang,Gang Li,Pengfei Zhang,Jingping Xu,Yaping Yang,Tiancai Zhang +10 more
TLDR
This work experimentally demonstrates the nonreciprocal transmission between two counterpropagating light fields with extremely low power by adopting the strong nonlinearity associated with a few atoms in a strongly coupled cavity QED system and an asymmetric cavity configuration.Abstract:
Optical nonreciprocity is important in photonic information processing to route the optical signal or prevent the reverse flow of noise. By adopting the strong nonlinearity associated with a few atoms in a strongly coupled cavity QED system and an asymmetric cavity configuration, we experimentally demonstrate the nonreciprocal transmission between two counterpropagating light fields with extremely low power. The transmission of 18% is achieved for the forward light field, and the maximum blocking ratio for the reverse light is 30 dB. Though the transmission of the forward light can be maximized by optimizing the impedance matching of the cavity, it is ultimately limited by the inherent loss of the scheme. This nonreciprocity can even occur on a few-photon level due to the high optical nonlinearity of the system. The working power can be flexibly tuned by changing the effective number of atoms strongly coupled to the cavity. The idea and result can be applied to optical chips as optical diodes by using fiber-based cavity QED systems. Our work opens up new perspectives for realizing optical nonreciprocity on a few-photon level based on the nonlinearities of atoms strongly coupled to an optical cavity.read more
Citations
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Journal of Physics B: atomic, molecular and optical physics
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Observation of Asymmetric Transport in Structures with Active Nonlinearities
Nicholas Bender,Samuel Factor,Josh Bodyfelt,Hamidreza Ramezani,Fred M. Ellis,Tsampikos Kottos +5 more
TL;DR: A mechanism for asymmetric transport which is based on parity-time-symmetric nonlinearities is presented, and it is shown that an increase of the complementary conductance strength leads to a simultaneous increase of asymmetry and transmittance intensity.
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Two-Photon Blockade in an Atom-Driven Cavity QED System
TL;DR: For a single atom strongly coupled to an optical cavity, it is shown that atom driving gives a decisively larger optical nonlinearity than cavity driving, which enhances single-photon blockade and allows for the implementation of two- photon blockade.
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Collision-Induced Broadband Optical Nonreciprocity.
Chao Liang,Bei Liu,An-Ning Xu,Xin Wen,Cuicui Lu,Cuicui Lu,Keyu Xia,Meng Khoon Tey,Yong-Chun Liu,Li You +9 more
TL;DR: By exploiting the thermal atomic collision, this work experimentally observe magnet-free and cavity-free optical nonreciprocity, which possesses a high isolation ratio, ultrabroad bandwidth, and low insertion loss simultaneously.
References
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TL;DR: Observations unequivocally show that quantum information tasks are achievable in solid-state cavity QED by observing quantum correlations in photoluminescence from a photonic crystal nanocavity interacting with one, and only one, quantum dot located precisely at the cavity electric field maximum.
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