Hidden and detectable squeezing from micro-resonators

TL;DR

This paper explores the quantum properties of light from silicon micro-resonators, revealing hidden squeezing features undetectable by standard methods, which impacts future quantum photonics applications.

Contribution

It introduces a theoretical model based on morphing supermodes that describes the quantum states generated by micro-resonators, highlighting the existence of hidden squeezing.

Findings

Standard homodyne detection cannot fully measure the generated quantum states.

The model reveals hidden quantum features not accessible by conventional detection.

Strategies are discussed to detect and utilize the hidden squeezing.

Abstract

In the context of quantum integrated photonics, this work investigates the quantum properties of light generated by silicon and silicon nitride micro-resonators pumped in pulsed regime. The developed theoretical model, performed in terms of the morphing supermodes, provides a comprehensive description of the generated quantum states. Remarkably, it shows that a full measurement of states carrying optimal squeezing levels is not accessible to standard homodyne detection, thus leaving hidden part of generated quantum features. By presenting and discussing this behaviour, as well as possible strategies to amend it, this work proves itself essential to future quantum applications exploiting micro-resonators as sources of multimode states.