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Updated: May 30, 2025

Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator

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Published on: December 15, 2021

Massively parallel Hong-Ou-Mandel interference based on independent soliton microcombs.

Long Huang^1,2, Weiqiang Wang¹, Fangxiang Wang³

¹State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, China.

Science Advances

|January 29, 2025

Summary

Researchers demonstrated 50 parallel Hong-Ou-Mandel (HOM) interference channels using soliton microcombs. This breakthrough enables scalable quantum communication by aligning laser pairs for enhanced indistinguishability testing.

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Area of Science:

Quantum Optics and Photonics
Quantum Information Science
Optical Communications

Background:

Hong-Ou-Mandel (HOM) interference is crucial for testing photon indistinguishability in quantum technologies.
Scaling HOM interference to massively parallel optical channels is hindered by the lack of natural optical references for aligning laser pairs.

Purpose of the Study:

To demonstrate high-visibility HOM interference across numerous parallel optical channels.
To overcome alignment challenges for massively parallel quantum information processing.
To explore the integration of quantum communication with classical wavelength division multiplexing.

Main Methods:

Utilized two independently frequency post-aligned soliton microcombs (SMCs) to generate 50 parallel comb-teeth pairs of continuous-wave weak coherent photons.
Developed fully frequency-stabilized SMCs with independent references for long-term alignment of comb-teeth pair frequencies.
Adjusted the free spectral range beyond 100 kilohertz through perturbations in the soliton state for precise alignment.

Main Results:

Achieved HOM interference with an average fringe visibility exceeding 46% across 50 parallel channels.
Demonstrated long-term frequency alignment of all comb-teeth pairs using stabilized soliton microcombs.
Verified the feasibility of constructing massively parallel quantum information channels.

Conclusions:

The study successfully demonstrates a scalable method for generating high-visibility HOM interference using soliton microcombs.
This approach integrates quantum information channels with classical wavelength division multiplexing, paving the way for practical large-scale quantum communication systems.