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Nonreciprocal Quantum Entanglement Against Backscattering

Ya‐Feng Jiao, Sheng-Dian Zhang, Yan‐Lei Zhang, Adam Miranowicz, Le‐Man Kuang, Hui Jing

Published Feb 25, 2020• 1 citation
OpenAlex

Abstract

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.

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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 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.
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 a nonreciprocal optical-microwave entanglement in a hybrid system composed of a spinning magnetic resonator and a microwave resonator. The optical Sagnac effect caused by the spinning of the magnetic resonator leads to a significant difference in the quantum entanglement for driving the magnetic resonator from opposite directions, which results in the nonreciprocal optical-microwave entanglement. Remarkably, the nonreciprocal optical-microwave entanglement determined by the spinning speed, driving direction, and driving frequency has a high tunability, so it can be turned on or off on demand. Our work opens up a new, to the best of our knowledge, route to achieve nonreciprocal entanglement between microwave and optical domains, which may have potential applications in chiral quantum networking.
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 propose how to achieve chiral photon blockade by spinning a nonlinear optical resonator. We show that by driving such a device at a fixed direction, completely different quantum effects can emerge for the counter-propagating optical modes, due to the spinning-induced breaking of time-reversal symmetry, which otherwise is unattainable for the same device in the static regime. Also, we find that in comparison with the static case, robust non-classical correlations against random backscattering losses can be achieved for such a quantum chiral system. Our work, extending previous works on the spontaneous breaking of optical chiral symmetry from the classical to purely quantum regimes, can stimulate more efforts towards making and utilizing various chiral quantum effects, including applications for chiral quantum networks or noise-tolerant quantum sensors.