A Novel Method for Polarization Squeezing with Photonic Crystal Fibers

TL;DR

This paper introduces a new method for generating high-purity polarization squeezed states using tailored Photonic Crystal Fibers, leveraging their enhanced Kerr nonlinearity and low excess noise to improve quantum state quality.

Contribution

The study demonstrates polarization squeezing with Photonic Crystal Fibers in a Sagnac interferometer, achieving higher purity and specific squeezing levels compared to standard fiber methods.

Findings

Achieved -3.9 dB Stokes parameter squeezing

Produced anti-squeezing of 16.2 dB

Utilized counter propagating pulses for near identical dispersion

Abstract

Photonic Crystal Fibers can be tailored to increase the effective Kerr nonlinearity, while producing smaller amounts of excess noise compared to standard silicon fibers. Using these features of Photonic Crystal Fibers we create polarization squeezed states with increased purity compared to standard fiber squeezing experiments. Explicit we produce squeezed states in counter propagating pulses along the same fiber axis to achieve near identical dispersion properties. This enables the production of polarization squeezing through interference in a polarization type Sagnac interferometer. We observe Stokes parameter squeezing of -3.9 +/- 0.3dB and anti-squeezing of 16.2 +/- 0.3dB.