Generation of squeezed light with monolithic optical parametric oscillator: Simultaneous achievement of phase matching and cavity resonance by temperature control

TL;DR

This paper demonstrates a method to generate highly squeezed light using a monolithic optical parametric oscillator with temperature control, enabling simultaneous phase matching and cavity resonance for quantum information applications.

Contribution

It introduces a technique to achieve phase matching and cavity resonance simultaneously by temperature control in a monolithic OPO, simplifying setup for quantum optics.

Findings

Achieved up to -8.0 dB of squeezing.

Bandwidth of 142 MHz for the squeezed light.

Technique allows driving multiple cavities with a single laser.

Abstract

We generate squeezed state of light at 860 nm with a monolithic optical parametric oscillator. The optical parametric oscillator consists of a periodically poled KTiOPO_4 crystal, both ends of which are spherically polished and mirror-coated. We achieve both phase matching and cavity resonance by controlling only the temperature of the crystal. We observe up to -8.0 dB of squeezing with the bandwidth of 142 MHz. Our technique makes it possible to drive many monolithic cavities simultaneously by a single laser. Hence our monolithic optical parametric oscillator is quite suitable to continuous-variable quantum information experiments where we need a large number of highly squeezed light beams.