Phase-Sensitive Manipulations of a Squeezed Vacuum Field in an Optical Parametric Amplifier inside an Optical Cavity

Abstract

A squeezed vacuum field can be amplified or deamplified when it is injected, as the signal beam, into a phase-sensitive optical parametric amplifier (OPA) inside an optical cavity. The spectral features of the reflected quantized signal field are controlled by the relative phase between the injected squeezed vacuum field and the pump field for the OPA. The experimental results demonstrate coherent phenomena of OPA in the quantum regime and show phase-sensitive manipulations of quantum fluctuations for quantum information processing.

A high-fidelity heralded quantum squeezing gate

“…High squeezing levels for vacuum inputs is possible through the parametric amplification process in an optical cavity. However, extending this method to arbitrary input states presents significant challenges due to cavity loss [13,18,19] and interference effects [20,21]. Instead, current state-of-the-art implementations of a universal squeezing gate use an ancillary squeezed vacuum as a resource to drive the squeezing gate [3,4,16,17].…”

Quantum limits for cascaded optical parametric amplifiers

“…For example, one can make the squeezed light from one DOPA as the seed for another DOPA. When both OPAs are on resonance, the degree of squeezing from the second OPA may be higher than that from the first one [24]. A recent experiment has shown that cascading three NOPAs can make a higher degree of entanglement [25].…”

Phase-sensitive reflection of squeezed vacuum field in optical cavity

“…The quantum fluctuation spectra for an optical empty cavity and the two-coupled cavities with an injected squeezed vacuum state have also been investigated in Refs. [15] and [16]. In these works, only over-coupled cavity is considered since its phase response undergoes a 2π phase shift.…”

“…The tomography of quantum states of bright light beam can be performed using this method [10,11] . The quantum fluctuation spectra of the subharmonic reflected field of a degenerate optical parametric amplifier (OPA) inside an optical cavity have been studied theoretically [14] and experimentally [15] , which is driven by the squeezed vacuum state. The quantum fluctuation spectra for an optical empty cavity and the two-coupled cavities with an injected squeezed vacuum state have also been investigated in Refs.…”