Multi-channel quantum noise suppression and phase-sensitive modulation in a hybrid optical resonant cavity system

TL;DR

This paper theoretically investigates quantum noise suppression and phase-sensitive modulation in a hybrid optical resonant cavity, revealing multiple dark windows and demonstrating significant noise reduction and modulation capabilities for quantum information applications.

Contribution

It introduces a novel multi-channel quantum noise suppression method with phase-sensitive modulation in a hybrid cavity system, enhancing control over quantum noise in quantum technologies.

Findings

Quantum noise suppression up to 13.9 dB at specific pump power.

Observation of multiple dark windows akin to EIT in quantum noise.

Effective phase-sensitive modulation filling the gap in multi-channel noise suppression.

Abstract

Quantum noise suppression and phase-sensitive modulation of continuously variable in vacuum and squeezed fields in a hybrid resonant cavity system are investigated theoretically. Multiple dark windows similar to electromagnetic induction transparency (EIT) are observed in quantum noise fluctuation curve. The effects of pumping light on both suppression of quantum noise and control the widths of dark windows are carefully analyzed, and the saturation point of pumping light for nonlinear crystal conversion is obtained. We find that the noise suppression effect is strongly sensitive to the pumping light power. The degree of noise suppression can be up to 13.9 dB when the pumping light power is 6.5 Beta_th. Moreover, a phase-sensitive modulation scheme is demonstrated, which well fills the gap that multi-channel quantum noise suppression is difficult to realize at the quadrature amplitude of squeezed field. Our result is meaningful for various applications in precise measurement physics, quantum information processing and quantum communications of system-on-a-chip.