Graph states and carrier-envelope phase squeezing

TL;DR

This paper introduces a new class of continuous-variable graph states for optical frequency combs, linking them to carrier-envelope phase squeezing, and discusses experimental measurement techniques for quantum noise and entanglement.

Contribution

It proposes a novel framework of graph states for describing entanglement and squeezing in optical frequency combs, connecting theoretical concepts with experimental measurement methods.

Findings

New class of continuous-variable graph states introduced

Carrier-envelope phase squeezing linked to specific graph states

Quantum heterodyne multiplexing proposed for measuring quantum noise

Abstract

We outline a new class of continuous-variable graph states that can be useful to describe entangle- ment, and also multimode squeezing, in an optical frequency comb. We show that a particular case of such states coincides with the squeezing of the carrier-envelope phase, or of the total intensity, of a mode-locked laser. We then discuss the experimental issues related to measuring the quantum noise of the carrier-envelope phase of a frequency comb and show that this can be carried out by use of quantum heterodyne multiplexing, a technique that may be useful to measure multipartite entanglement as well.