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Related Experiment Video

Updated: May 10, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Efficient on-chip platform for coherent light-matter coupling using bound states in the continuum.

Pai Zhou¹, Hui-Zhen Zhang¹, Tingmei Li¹

¹Key Laboratory of advanced optoelectronic quantum architecture and measurement of Ministry of Education, Beijing Key Laboratory of Nanophotonics & Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing 100081, China.

Science Advances

|April 25, 2025

Summary

This study introduces a novel silicon-chip platform using bound states in the continuum for efficient optical quantum network memories. It demonstrates enhanced light absorption and long coherence times, overcoming previous limitations.

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Area of Science:

Quantum Information Science
Materials Science
Photonics

Background:

Scalable optical quantum networks require efficient photonic qubit storage and retrieval.
Integrating silicon photonics with telecom memories faces challenges like limited light-matter interaction and decoherence.

Purpose of the Study:

To develop an efficient silicon-chip platform for optical quantum memories.
To overcome limitations of existing hybrid silicon photonics and erbium ion systems.
To enhance light-matter interactions and reduce decoherence in integrated optical memories.

Main Methods:

Utilized bound states in the continuum (BSCs) within a silicon-chip platform.
Fabricated waveguide structures with low propagation loss (0.5 ± 0.5 dB/cm).
Experimentally demonstrated photon echoes to measure coherence time.

Main Results:

Achieved an order-of-magnitude enhancement in light absorption compared to traditional silicon hybrid designs.
Demonstrated photon echoes in waveguide structures.
Measured a coherence time of 2.6 ± 0.6 microseconds at zero magnetic field, comparable to bulk crystals.

Conclusions:

The bound state in the continuum silicon-chip platform offers a promising solution for integrated optical memories.
This technology can significantly advance the development of scalable optical quantum networks.
The enhanced light-matter interaction and long coherence times are critical for quantum memory applications.