High-Order Continuous-Variable Coherence of Phase-Dependent Squeezed State

TL;DR

This paper investigates the high-order coherence properties of phase-dependent squeezed states using an extended Hanbury Brown-Twiss scheme, revealing controllable quantum-to-classical transitions useful for quantum technologies.

Contribution

It introduces a method to generate and control high-order coherence in phase-dependent squeezed states by tuning squeezing parameters and phase, with analysis of noise effects.

Findings

Photon statistics transition from anti-bunching to super-bunching as phase varies

High-order coherence can be continuously controlled via squeezing parameters

Feasibility of experimental implementation is demonstrated

Abstract

We study continuous variable coherence of phase-dependent squeezed state based on an extended Hanbury Brown-Twiss scheme. High-order coherence is continuously varied by adjusting squeezing parameter $r$, displacement $\alpha $, and squeezing phase $\theta $. We also analyze effects of background noise $\gamma $ and detection efficiency $\eta $ on the measurements. As the squeezing phase shifts from 0 to $\pi $, the photon statistics of the squeezed state continuously change from the anti-bunching ($g^{(n)}<1$) to super-bunching ($g^{(n)}>n!$) which shows a transition from particle nature to wave nature. The experiment feasibility is also examined. It provides a practical method to generate phase-dependent squeezed states with high-order continuous-variable coherence by tuning squeezing phase $\theta $. The controllable coherence source can be applied to sensitivity improvement in gravitational wave detection and quantum imaging.