A research team from the School of Physics at Zhengzhou University (ZZU) has developed a new mechanism for enhancing nonreciprocal optical effects through compression-induced symmetry breaking. The work establishes a universal theoretical framework for dissipation-based nonreciprocal control and was published in the journal Physical Review Letters.
Nonreciprocal transmission is essential for optical isolation, circulation, and on-chip photonic networks. While traditional magneto-optical isolators are difficult to embed into chips, recent dissipation-engineered schemes offer broad bandwidth and tunability without external magnetic fields. However, their nonreciprocal strength is limited by system parameters.
The team constructed a model of two resonant cavities sharing a common dissipative reservoir, with independent compression fields introduced in both the cavities and the reservoir. They found that the asymmetric compression amplitude or phase activates a strong enhancement of nonreciprocal coupling — exponentially stronger than conventional single-cavity schemes and requiring less experimental compression strength.
This enhancement, the team discovered, is not simply a coupling amplification but a reconfiguration of energy transmission pathways through optimized compression resource allocation. The effect was validated in quantum battery and integrated optical isolator models, showing orders-of-magnitude improvement in energy storage, work extraction, and unidirectional transmission. The researchers also provided analytical theory and numerical phase diagrams, proposing feasible experimental implementations using lithium niobate microrings and superconducting resonators.
The findings deepen scientists' understanding of the connections between quantum compression, dissipation engineering, and non-Hermitian physics, offering a theoretical foundation for designing high-performance quantum photonic and energy devices.
The ZZU team achieves a breakthrough in quantum nonreciprocal optics. [Photo/zzu.edu.cn]