Magnon-Squeezing-Induced Nonreciprocal Quantum Coherence in a Cavity Magnomechanical System

TL;DR

This paper explores how magnon squeezing can control and enhance quantum coherence nonreciprocally in a cavity magnomechanical system, with implications for quantum information processing.

Contribution

It introduces the use of squeezed magnons to modulate quantum coherence, demonstrating phase control and robustness against thermal noise in hybrid systems.

Findings

Magnon squeezing enables phase-dependent coherence control.

Increasing drive power and coupling enhances quantum coherence.

Magnon squeezing partially suppresses thermal decoherence.

Abstract

We investigate quantum coherence in a hybrid cavity magnomechanical system incorporating a squeezed-magnon drive. By analyzing the Gaussian quantum coherence of the cavity, magnonic, and mechanical subsystems, as well as the total system coherence, we identify the critical roles of phase control, coupling strength, drive power, and thermal noise. We show that the squeezing amplitude and phase precisely modulate the effective magnon frequency and damping, enabling phase-dependent enhancement and nonreciprocal transfer of coherence. Our systematic parameter analysis indicates that increasing driving power and photon-magnon coupling enhances quantum coherence, while thermal decoherence leads to its degradation. However, this effect is partially suppressed by the presence of magnon squeezing. The results show that squeezed magnons are a robust and tunable resource for controlling, stabilizing, and optimizing quantum coherence in cavity magnomechanical platforms, offering potential applications in hybrid magnonic systems and coherent quantum information processing.