Single-photon-triggered spin squeezing with decoherence reduction in optomechanics via phase matching

TL;DR

This paper proposes a scheme for generating spin squeezing triggered by a single photon in an optomechanical system, effectively reducing decoherence and thermal noise, with potential applications in quantum information processing.

Contribution

It introduces a novel method combining phase-matched squeezed reservoirs and a Dicke model in optomechanics to achieve robust, decoherence-resistant spin squeezing triggered by a single photon.

Findings

Single-photon-triggered spin squeezing can be achieved with reduced decoherence.

The system suppresses thermal noise completely through phase matching.

Generated spin squeezing is immune to environmental thermal noise.

Abstract

Quantum spin squeezing is an important resource for quantum information processing, but its squeezing degree is not easy to preserve in an open system with decoherence. Here, we propose a scheme to implement single-photon-triggered spin squeezing with decoherence reduction in an open system. In our system, a Dicke model (DM) is introduced into the quadratic optomechanics, which can be equivalent to an effective DM manipulated by the photon number. Besides, the phonon mode of the optomechanical system is coupled to a squeezed vacuum reservoir with a phase matching, resulting in that the thermal noise caused by the environment can be suppressed completely. We show that squeezing of the phonon mode triggered by a single photon can be transferred to the spin ensemble totally, and pairwise entanglement of the spin ensemble can be realized if and only if there is spin squeezing. Importantly, when considering the impact of the environment, our system can obtain a better squeezing degree than the optimal squeezing that can be achieved in the traditional DM. Meanwhile, the spin squeezing generated in our system is immune to the thermal noise. This work offers an effective way to generate spin squeezing with a single photon and to reduce decoherence in an open system, which will have promising applications in quantum information processing.