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

Advanced Quantum Technologies

Steady‐State Nonreciprocal Strong Mechanical Squeezing Against Thermal Noise via Periodic Driving

Cheng‐Hua Bai, Suying Bai, Shao‐Xiong Wu, Qi Guo, Wen-Yuan Liu, Hong‐Fu Wang, Jun Tang

Published Feb 1, 2026• 0 citations
Publisher

Abstract

ABSTRACT Based on the Sagnac effect, we propose how to achieve nonreciprocal strong mechanical squeezing via periodic driving in a spinning microdisk optomechanical system. We find that the strong nonreciprocal squeezing effect happens when the system is driven by a periodically modulated pump in a chosen port but not in the other. By appropriately choosing the ratio of the optomechanical coupling sidebands, the squeezing degree in the steady state can far surpass the 3‐dB limit. We provide a detailed analysis of the underlying nonreciprocal squeezing mechanism by introducing the Bogoliubov mode and demonstrate that cooling it into ground state is the decisive factor to generate the nonreciprocal squeezing effect. We show that the proposed scheme has strong robustness against thermal noise and even for high thermal phonon occupation number , the 3‐dB squeezing limit still can be broken. Specifically, by utilizing the technique of adiabatic elimination of cavity mode, we obtain the analytical result of nonreciprocal squeezing, which matches very well with the numerical simulation. We also demonstrate that the generated nonreciprocal squeezing can be effectively measured by the output field in the experiment. Our scheme provides a potential path to manipulate nonreciprocal mechanical squeezing and also has significant applications ranging from nonreciprocal quantum metrology to directional quantum communication.

DOI
10.1002/qute.202500603

Related papers

Nonreciprocal Enhancement of Optomechanical Entanglement Based on Sagnac Effect and Pump Modulation

Chen‐Qi Zhou, A‐Peng Liu, Qi Guo

Abstract A scheme is proposed to enhance the optomechanical entanglement nonreciprocally in a spinning cavity optomechanical system driven by a periodically modulated pump field. Based on the Sagnac effect induced by the resonator's spinning, the direction‐dependent frequency shifts are introduced to the counterpropagating optical modes. By combining the Sagnac effect with periodic pump modulation, the optomechanical entanglement can be enhanced nonreciprocally by a factor of about 1.67. It is shown that the negative effect of the backscattering losses on nonreciprocal entanglement enhancement can be eliminated by spinning the resonator. Meanwhile, the enhanced entanglement exhibits strong robustness against thermal noise, surviving even at environmental temperature up to 0.99 K. This work is expected to promote the development of nonreciprocal quantum networks and quantum control techniques.

Annalen der Physik•Jul 12, 2025•1 citation

Nonreciprocal Strong Mechanical Squeezing Based on the Kerr Effect in Cavity‐Magnon Optomechanical System

Jia‐Le Tong, Yue Hao, Shaoxiong Wu +2 more

Abstract In this study, a scheme is proposed to generate nonreciprocal strong mechanical squeezing in a cavity‐magnon optomechanical system based on the Kerr nonlinearity of the yttrium‐iron garnet (YIG) sphere. It is found that the magnon squeezing can be directly produced by the Kerr effect and it can induce strong mechanical squeezing through the squeezing transfer achieved by the cavity‐magnon interaction and the optomechanical interaction. The results further show that the mechanical mode coupled to the cavity can achieve squeezing effect in the selected magnetic field direction, but not in the opposite one. Moreover, by properly adjusting the magnon effective detuning and the Kerr effect strength, the degree of squeezing of the mechanical mode can even beyond the 3‐dB limit, and the optimal conditions for generating stronger squeezing are obtained. This work has important applications in the nonreciprocal quantum devices, quantum information processing, and quantum precision measurement.

Advanced Quantum Technologies•Jan 22, 2025•10 citations

Nonreciprocal mechanical squeezing in cavity magnomechanics

Hao Wu, Ping-Chi Ge, Xue Yan Han +2 more

We propose a scheme to achieve nonreciprocal mechanical squeezing in a hybrid Kerr-modified cavity magnomechanical system, where the magnon mode is driven by two-tone microwave fields. The nonreciprocity originates from the magnon Kerr effect. Strong mechanical squeezing beyond the 3 dB limit can be nonreciprocally generated by adjusting the magnon frequency detuning, effective magnomechanical coupling strength, as well as the damping of the oscillator and the dissipation of the cavity. Importantly, the proposed scheme is robust against environmental thermal noise and system dissipation, ensuring its feasibility under current experimental conditions. This work may pave the way for the development of nonreciprocal quantum devices, such as isolators and circulators. Furthermore, the ability to achieve such robust mechanical squeezing has significant implications for advancing quantum precision measurements in metrology and sensing, offering new opportunities for exploring quantum-enhanced technologies.

EPJ Quantum Technology•Dec 1, 2024•5 citations

Nonreciprocal phonon blockade in spin quadratic optomechanical systems

Yao Dong, Guo-Feng Zhang

We propose a scheme for achieving nonreciprocal phonon blockade in a quadratic optomechanical (QOM) system consisting of two spinning resonators near-field coupled to a nanomechanical oscillator. Due to the Sagnac-Fizeau effect, pump fields propagating in opposite directions experience distinct effective detunings,thereby leading to asymmetric intracavity intensities. Through the optical spring effect, this intensity imbalance gives rise to direction-dependent shifts in the effective mechanical frequency, providing the core mechanism for nonreciprocal phonon blockade. By judiciously setting parameters, single-phonon resonant excitation leads to conventional phonon blockade for one pump direction, whereas two-phonon resonance facilitates phononinduced tunneling (PIT) for the other. The pronounced nonreciprocity is quantified by a contrast ratio in the phonon second-order correlation function exceeding 55 dB. To elucidate the nonreciprocal statistics, the phonon blockade is further analyzed in terms of interference between the coherent component and squeezed fluctuations. Incorporating thermal phonons, we reveal an extended nonreciprocal thermal effect, where increasing thermal noise degrades antibunching toward Poissonian statistics in one direction, yet reverses the statistics from bunching to antibunching in the opposite direction. Our work provides a pathway toward nonreciprocal phonon devices and directional phonon switches, with potential applications in chiral networks and phononic information processing.

quant-pharXiv:2607.19872•Jul 23, 2026

Highly Squeezed Mechanical State Generation in an Optomechanical System Assisted by Nitrogen‐Vacancy Ensembles

Yangyang Wang, Qian Liu

ABSTRACT Narrow linewidth and macroscopically accessible mechanical microstructures make mechanical squeezing a promising platform for ultra‐high‐sensitivity detection and fundamental investigations of classical‐to‐quantum quantum effects. The conventional approaches to utilizing optomechanical interactions for generating mechanical squeezing are restricted to the resolved‐sideband regime, limiting their practical applicability. In this paper, we propose a scheme to generate a highly squeezed mechanical state in both resolved‐ and unresolved‐sideband optomechanical systems assisted by nitrogen‐vacancy ensembles (NVEs). By coupling two NVEs to the optical cavity, the detrimental counter‐rotating terms that degrade mechanical squeezing are efficiently suppressed via destructive quantum interference originating from the NVEs‐cavity coupling channels. Numerical results reveal that mechanical squeezing exhibits non‐monotonic behavior with respect to both the optomechanical coupling ratio and the cavity‐spin coupling strength. Moreover, the achievable degree of mechanical squeezing degrades as the initial thermal‐phonon occupation of the mechanical resonator and the dissipation rates of the NVEs increase. This work offers an alternative feasible pathway toward strong mechanical squeezing beyond the 3‐dB limit and broadens the application scope of hybrid solid‐state‐optomechanical quantum systems.

Annalen der Physik•Sep 1, 2026•0 citations

Optomechanical squeezing with strong harmonic mechanical driving

Xinyu Lin, Guang-Zheng Ye, Ye Liu +2 more

In this paper, we propose an optomechanical scheme for generating mechanical squeezing over the 3 dB limit, with the mechanical mirror being driven by a strong and linear harmonic force. In contrast to parametric mechanical driving, the linearly driven force shakes the mechanical mirror periodically oscillating at twice the mechanical eigenfrequency with large amplitude, where the mechanical mirror can be dissipatively stabilized by the engineered cavity reservoir to a dynamical squeezed steady state with a maximum degree of squeezing over 8 dB. The mechanical squeezing of more than 3 dB can be achieved even for a mechanical thermal temperature larger than 100 mK. The scheme can be implemented in a cascaded optomechanical setup, with potential applications in engineering continuous variable entanglement and quantum sensing.

Optics Express•Feb 7, 2024•3 citations
ABSTRACT Based on the Sagnac effect, we propose how to achieve nonreciprocal strong mechanical squeezing via periodic driving in a spinning microdisk optomechanical system. We find that the strong nonreciprocal squeezing effect happens when the system is driven by a periodically modulated pump in a chosen port but not in the other. By appropriately choosing the ratio of the optomechanical coupling sidebands, the squeezing degree in the steady state can far surpass the 3‐dB limit. We provide a detailed analysis of the underlying nonreciprocal squeezing mechanism by introducing the Bogoliubov mode and demonstrate that cooling it into ground state is the decisive factor to generate the nonreciprocal squeezing effect. We show that the proposed scheme has strong robustness against thermal noise and even for high thermal phonon occupation number , the 3‐dB squeezing limit still can be broken. Specifically, by utilizing the technique of adiabatic elimination of cavity mode, we obtain the analytical result of nonreciprocal squeezing, which matches very well with the numerical simulation. We also demonstrate that the generated nonreciprocal squeezing can be effectively measured by the output field in the experiment. Our scheme provides a potential path to manipulate nonreciprocal mechanical squeezing and also has significant applications ranging from nonreciprocal quantum metrology to directional quantum communication.
Abstract A scheme is proposed to enhance the optomechanical entanglement nonreciprocally in a spinning cavity optomechanical system driven by a periodically modulated pump field. Based on the Sagnac effect induced by the resonator's spinning, the direction‐dependent frequency shifts are introduced to the counterpropagating optical modes. By combining the Sagnac effect with periodic pump modulation, the optomechanical entanglement can be enhanced nonreciprocally by a factor of about 1.67. It is shown that the negative effect of the backscattering losses on nonreciprocal entanglement enhancement can be eliminated by spinning the resonator. Meanwhile, the enhanced entanglement exhibits strong robustness against thermal noise, surviving even at environmental temperature up to 0.99 K. This work is expected to promote the development of nonreciprocal quantum networks and quantum control techniques.
Abstract In this study, a scheme is proposed to generate nonreciprocal strong mechanical squeezing in a cavity‐magnon optomechanical system based on the Kerr nonlinearity of the yttrium‐iron garnet (YIG) sphere. It is found that the magnon squeezing can be directly produced by the Kerr effect and it can induce strong mechanical squeezing through the squeezing transfer achieved by the cavity‐magnon interaction and the optomechanical interaction. The results further show that the mechanical mode coupled to the cavity can achieve squeezing effect in the selected magnetic field direction, but not in the opposite one. Moreover, by properly adjusting the magnon effective detuning and the Kerr effect strength, the degree of squeezing of the mechanical mode can even beyond the 3‐dB limit, and the optimal conditions for generating stronger squeezing are obtained. This work has important applications in the nonreciprocal quantum devices, quantum information processing, and quantum precision measurement.
We propose a scheme to achieve nonreciprocal mechanical squeezing in a hybrid Kerr-modified cavity magnomechanical system, where the magnon mode is driven by two-tone microwave fields. The nonreciprocity originates from the magnon Kerr effect. Strong mechanical squeezing beyond the 3 dB limit can be nonreciprocally generated by adjusting the magnon frequency detuning, effective magnomechanical coupling strength, as well as the damping of the oscillator and the dissipation of the cavity. Importantly, the proposed scheme is robust against environmental thermal noise and system dissipation, ensuring its feasibility under current experimental conditions. This work may pave the way for the development of nonreciprocal quantum devices, such as isolators and circulators. Furthermore, the ability to achieve such robust mechanical squeezing has significant implications for advancing quantum precision measurements in metrology and sensing, offering new opportunities for exploring quantum-enhanced technologies.
We propose a scheme for achieving nonreciprocal phonon blockade in a quadratic optomechanical (QOM) system consisting of two spinning resonators near-field coupled to a nanomechanical oscillator. Due to the Sagnac-Fizeau effect, pump fields propagating in opposite directions experience distinct effective detunings,thereby leading to asymmetric intracavity intensities. Through the optical spring effect, this intensity imbalance gives rise to direction-dependent shifts in the effective mechanical frequency, providing the core mechanism for nonreciprocal phonon blockade. By judiciously setting parameters, single-phonon resonant excitation leads to conventional phonon blockade for one pump direction, whereas two-phonon resonance facilitates phononinduced tunneling (PIT) for the other. The pronounced nonreciprocity is quantified by a contrast ratio in the phonon second-order correlation function exceeding 55 dB. To elucidate the nonreciprocal statistics, the phonon blockade is further analyzed in terms of interference between the coherent component and squeezed fluctuations. Incorporating thermal phonons, we reveal an extended nonreciprocal thermal effect, where increasing thermal noise degrades antibunching toward Poissonian statistics in one direction, yet reverses the statistics from bunching to antibunching in the opposite direction. Our work provides a pathway toward nonreciprocal phonon devices and directional phonon switches, with potential applications in chiral networks and phononic information processing.
ABSTRACT Narrow linewidth and macroscopically accessible mechanical microstructures make mechanical squeezing a promising platform for ultra‐high‐sensitivity detection and fundamental investigations of classical‐to‐quantum quantum effects. The conventional approaches to utilizing optomechanical interactions for generating mechanical squeezing are restricted to the resolved‐sideband regime, limiting their practical applicability. In this paper, we propose a scheme to generate a highly squeezed mechanical state in both resolved‐ and unresolved‐sideband optomechanical systems assisted by nitrogen‐vacancy ensembles (NVEs). By coupling two NVEs to the optical cavity, the detrimental counter‐rotating terms that degrade mechanical squeezing are efficiently suppressed via destructive quantum interference originating from the NVEs‐cavity coupling channels. Numerical results reveal that mechanical squeezing exhibits non‐monotonic behavior with respect to both the optomechanical coupling ratio and the cavity‐spin coupling strength. Moreover, the achievable degree of mechanical squeezing degrades as the initial thermal‐phonon occupation of the mechanical resonator and the dissipation rates of the NVEs increase. This work offers an alternative feasible pathway toward strong mechanical squeezing beyond the 3‐dB limit and broadens the application scope of hybrid solid‐state‐optomechanical quantum systems.
In this paper, we propose an optomechanical scheme for generating mechanical squeezing over the 3 dB limit, with the mechanical mirror being driven by a strong and linear harmonic force. In contrast to parametric mechanical driving, the linearly driven force shakes the mechanical mirror periodically oscillating at twice the mechanical eigenfrequency with large amplitude, where the mechanical mirror can be dissipatively stabilized by the engineered cavity reservoir to a dynamical squeezed steady state with a maximum degree of squeezing over 8 dB. The mechanical squeezing of more than 3 dB can be achieved even for a mechanical thermal temperature larger than 100 mK. The scheme can be implemented in a cascaded optomechanical setup, with potential applications in engineering continuous variable entanglement and quantum sensing.