Time-domain measurement of ultra-fast intensity difference squeezed pulse pairs generated in fiber

TL;DR

This paper demonstrates the first time-domain measurement of intensity difference squeezed pulse pairs generated via four-wave mixing in fiber, revealing pair-wise correlations and significant squeezing useful for multi-mode entanglement.

Contribution

It introduces a novel time-domain measurement technique for fiber-based squeezed pulses, showing pair-wise correlations and quantifying squeezing levels.

Findings

Pair-wise correlation of pulses confirmed in fiber system

Achieved -3.8 dB intensity difference squeezing in time domain

Results enable multi-mode entangled state generation via time-division multiplexing

Abstract

Pulsed pumped four-wave mixing process via $\chi^{(3)}$ non-linearity in optical fiber can generate optical pulses with continuous variable quantum correlation. However, pair-wise correlation of the generated pulses in this system has not been studied. Here we report a time-domain measurement of an intensity difference squeezed state generated in fiber. With a fast response differential detection system, we show the generated twin-beam pulses are pair-wisely correlated, and -3.8 dB (-8.1 dB after detection losses correction) intensity difference squeezing degree is measured in time-domain. Our result is benefit for generating multi-mode entangled state by time-division multiplexing in fiber system.