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Related Experiment Video

Updated: May 7, 2026

Quasi-light Storage for Optical Data Packets

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

Towards arbitrary time-frequency mode squeezing with self-conjugated mode squeezing in fiber.

Han Liu¹, Meng Lon Iu², Noor Hamdash²

¹The Edward S. Rogers Sr. Department of Electrical & Computer Engineering, University of Toronto, Toronto, ON, Canada. qwerty.liu@mail.utoronto.ca.

Nature Communications

|July 15, 2025

Summary

Researchers relaxed the modal constraint for squeezed light generation using optical parametric amplification. This allows for squeezing in arbitrary time-frequency modes, achieving record levels in fiber sources.

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Area of Science:

Quantum optics
Nonlinear optics

Background:

Optical parametric amplification (OPA) generates squeezed light.
Squeezing detection traditionally requires adherence to device-specific time-frequency eigenmodes.
This modal constraint limits the flexibility of squeezed light utilization.

Purpose of the Study:

To investigate the relaxation of modal constraints in squeezed light generation via OPA.
To demonstrate that squeezing can be detected in arbitrary time-frequency modes.
To achieve high levels of squeezing in fiber-based sources.

Main Methods:

Theoretical analysis under continuous-wave pump and broadband phase-matching approximation.
Identification of self-conjugated spectral symmetry as a condition for approximating squeezing eigenmodes.
Experimental demonstration using a high-efficiency, low-loss all-fiber OPA source.
Partial homodyne detection for heralding squeezing in arbitrary modes.

Main Results:

Demonstrated relaxation of the modal constraint for squeezed light generation.
Achieved 4.38 ± 0.11 dB squeezing on partially coherent self-conjugated modes.
Achieved 0.88 ± 0.09 dB squeezing on chaotic self-conjugated modes.
Obtained 7.50 ± 0.12 dB squeezing using a bichromatic self-conjugated mode, a record for guided-wave sources.

Conclusions:

The modal constraint for squeezed light generation can be significantly relaxed.
Self-conjugated time-frequency modes enable squeezing detection in arbitrary modes.
This work paves the way for more versatile applications of squeezed light from fiber sources.