arXiv subjects

D. -Y. Wang

Publications and source records attributed to D. -Y. Wang.

3 recordsLinked to original sources

arXiv2026

Enhancing Nonreciprocity through Squeezing-Induced Symmetry Breaking

Reservoir engineering enables unidirectional energy and signal flow. We establish squeezing-induced symmetry breaking between two cavities as a guiding principle for exponentially amplifying reservoir-mediated nonreciprocity. Rather than a simple scaling of the coupling, this mechanism strategically redistributes the squeezing resources to relax experimental requirements, as single-cavity squeezing alone demands a much larger squeezing strength. Moreover, reservoir squeezing does not alter the system symmetry, but reshapes the noise correlations and thereby changes the system dynamics. The proposed mechanism improves the performance of the quantum battery by several orders of magnitude, including stored energy, charging power, and ergotropy, with the analytical expressions provided. Extending to the optical isolation, we observe a second-order exponential enhancement of the output signal. Our results open a new avenue for nonreciprocal quantum information processing and nonreciprocal quantum device design.

quant-ph↗

arXiv2025

Optomechanically Induced Transparency on Exceptional Surfaces

Exceptional points (EPs) are singularities in non-Hermitian systems, where the system transmission spectrum varies significantly at the phase transition point. Here, we propose a practical scheme to study the changes of the optomechanically induced transparency (OMIT) spectrum on the exceptional surface (ES), which is formed by designing the structure of the waveguide in a non-Hermitian cavity optomechanical system. By comparing the transmission spectra of the system at different normal points, EPs on the same or different ESs, and exceptional derived points, we find that the peak-valley conversion of the system transmission spectra is obtained at the phase transition point and the arbitrary manipulation of the system transmission spectrum can be realized by moving the system on the same or different ESs. Furthermore, the phenomena of conversion and enhancement of the fast-slow light in the system transmission spectra have also been discovered in our researches. Different from the isolated EP, our proposal can discuss the system properties at different EPs, can find a richer transmission spectrum, and can provide more convenient options for experimental implementation, which paves the way for studying the nature of non-Hermitian systems in a higher dimension.

quant-ph↗

arXiv2023

Enhancement of Quantum Sensing in a Cavity Optomechanical System around Quantum Critical Point

The precision of quantum sensing could be improved by exploiting quantum phase transitions, where the physical quantity tends to diverge when the system approaches the quantum critical point. This critical enhancement phenomenon has been applied to the quantum Rabi model in a dynamic framework, showing a promising sensing enhancement without the need for complex initial state preparation. In this work, we present a quantum phase transition in the coupling cavity-mechanical oscillator system when the coupling strength crosses a critical point, determined by the effective detuning of cavity and frequency of mechanical mode. By utilizing this critical phenomenon, we obtain a prominent enhancement of quantum sensing, such as the position and momentum of the mechanical oscillator. This result provides an alternative method to enhance the quantum sensing of some physical quantities, such as mass, charge, and weak force, in a large mass system.

quant-ph↗