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Backscattering-Immune Nonreciprocal Optical Solitons in a Spinning Resonator

Bai‐Jun Li, Şahin Kaya Özdemir, Xun‐Wei Xu, Lin Zhang, Hui Jing

Published Dec 1, 2020• 0 citations
OpenAlex

Abstract

We show that nonreciprocal optical solitons that are immune to backscattering-induced losses appear in a spinning optical Kerr resonator. Nonreciprocity in this device results from the Sagnac-Fiezau drag effect, which is different for pump fields propagating in the spinning direction or in the direction opposite to it. We find that these nonreciprocal solitons are more robust against backscattering losses if the spinning speed of the resonator is properly set. Our work represents a stable nonreciprocal soliton device and provides a promising technique for one-way soliton isolators and lasers, backaction-immmune soliton communication, and enhanced soliton-comb metrology.

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We show that nonreciprocal optical solitons that are immune to backscattering-induced losses appear in a spinning optical Kerr resonator. Nonreciprocity in this device results from the Sagnac-Fiezau drag effect, which is different for pump fields propagating in the spinning direction or in the direction opposite to it. We find that these nonreciprocal solitons are more robust against backscattering losses if the spinning speed of the resonator is properly set. Our work represents a stable nonreciprocal soliton device and provides a promising technique for one-way soliton isolators and lasers, backaction-immmune soliton communication, and enhanced soliton-comb metrology.
We study how to achieve, manipulate, and switch classical or quantum nonreciprocal effects of light with a spinning Kerr resonator. In particular, we show that even when there is no classical nonreciprocity (i.e., with the same mean number of photons for both clockwise and counterclockwise propagating modes), it is still possible to realize nonreciprocity of quantum correlations of photons in such a device. Also, by tuning the angular velocity and the optical backscattering strength, higher-order quantum nonreciprocity can appear, featuring qualitatively different third-order optical correlations, even in the absence of any nonreciprocity for both the mean photon number and its second-order correlations. The possibility to switch a single device between a classical isolator and a purely quantum directional system can provide more functions for nonreciprocal materials and new opportunities to realize novel quantum effects and applications, such as nonreciprocal multi-photon blockade, one-way photon bundles, and backaction-immune quantum communications.
We propose how to achieve nonreciprocal quantum entanglement of light and motion and reveal its counterintuitive robustness against random losses. We find that by splitting the counterpropagating lights of a spinning resonator via the Sagnac effect, photons and phonons can be entangled strongly in a chosen direction but fully uncorrelated in the other. This makes it possible both to realize quantum nonreciprocity even in the absence of any classical nonreciprocity and also to achieve significant entanglement revival against backscattering losses in practical devices. Our work provides a way to protect and engineer quantum resources by utilizing diverse nonreciprocal devices, for building noise-tolerant quantum processors, realizing chiral networks, and backaction-immune quantum sensors.
We study how to achieve, manipulate, and switch classical or quantum nonreciprocal effects of light with a spinning Kerr resonator. In particular, we show that even when there is no classical nonreciprocity (i.e., with the same mean number of photons for both clockwise and counterclockwise propagating modes), it is still possible to realize nonreciprocity of quantum correlations of photons in such a device. Also, by tuning the angular velocity and the optical backscattering strength, purely higher-order quantum nonreciprocity can appear, featuring qualitatively different third-order optical correlations, even in the absence of any nonreciprocity for both the mean photon number and its second-order correlations. The possibility to switch a single device between a classical isolator and a purely quantum directional system can provide more functions for nonreciprocal materials and new opportunities to realize novel quantum effects and applications, such as nonreciprocal multiphoton blockade, one-way photon bundles, and back-action-immune quantum communications.
In our recent research1, it was suggested that counter-propagating laser beams in a Kerr-nonlinear medium can induce intensity-dependent nonreciprocity which consists in different changes of refractive indecies for both of the waves. Under some conditions, this can result in such directionally asymmetrical effects as (i) directional bistability in a nonlinear ring resonator which allows one to switch the direction of propagation of a dominant mode and (ii) enhancement of the Sagnac effect in a rotating ring resonator.
We propose how to achieve nonreciprocal light-sound entanglement in a spinning resonator and maintain its quality against backscattering losses. We find that by splitting the counter-propagating lights of the resonator via the Sagnac effect, quantum entanglement can be created from one side while prohibited from the other, and it is possible to switch such a single device between a classical isolator and a purely quantum diode. Particularly, in the presence of backscattering due to material imperfections in practical devices, significant entanglement revival can be achieved in a highly asymmetric way. This reveals a new strategy to protect quantum resources by engineering nonreciprocal devices, for building noise-tolerant quantum processors, realizing chiral networks, and invisible quantum sensing.
We propose to achieve a multicolor nonreciprocal optical amplifier, a crucial device in optical communication and information processing, by spinning an active resonator. We show that in such a device, due to the interplay of the Sagnac effect and the optical gain, nonreciprocal signal amplification can be realized, accompanied by a giant enhancement of optical group delay from 0.3ms0.3\phantom{\rule{0.28em}{0ex}}\mathrm{ms}0.3ms to 35ms35\phantom{\rule{0.28em}{0ex}}\mathrm{ms}35ms in a chosen direction, which is otherwise unattainable in a passive device. Also, coherent amplification of higher-order optical sidebands and a slow-to-fast light switch can be achieved by tuning both the pump power and the spinning velocity. Our work provides a unique and accessible way, well compatible with other existing techniques, to realize multicolor nonreciprocal optical amplifiers for more flexible control of optical fields.