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Related Experiment Video

Updated: Sep 2, 2025

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

High-fidelity photonic quantum logic gate based on near-optimal Rydberg single-photon source.

Shuai Shi¹, Biao Xu¹, Kuan Zhang¹

¹MOE Key Laboratory of Fundamental Physical Quantities Measurement, Hubei Key Laboratory of Gravitation and Quantum Physics, PGMF, Institute for Quantum Science and Engineering, School of Physics, Huazhong University of Science and Technology, Wuhan, 430074, China.

Nature Communications

|August 1, 2022

Summary

This summary is machine-generated.

High-fidelity photon gates are crucial for optical quantum computers. Researchers demonstrated a linear-optical quantum logic gate with 99.84% fidelity using a near-optimal single-photon source, enabling scalable photonic quantum applications.

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Last Updated: Sep 2, 2025

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Published on: June 8, 2018

Area of Science:

Quantum Information Science
Quantum Optics
Photonic Quantum Computing

Background:

Photons offer advantages for long-distance quantum communication, making them ideal for modular optical quantum computers.
Low fidelity and probabilistic nature of current two-photon gates limit scalability and increase resource overhead for fault-tolerant quantum computation.
Single-photon source imperfections restrict the fidelity of linear-optical quantum logic gates.

Purpose of the Study:

To demonstrate a high-fidelity linear-optical quantum logic gate.
To overcome limitations imposed by single-photon source imperfections.
To enable scalable photonic quantum computing applications.

Main Methods:

Utilized a near-optimal Rydberg single-photon source.
Implemented a linear-optical quantum logic gate.
Employed post-selection upon photon detection to achieve high fidelity.

Main Results:

Achieved a truth table fidelity of 99.84(3)% for the linear-optical quantum logic gate.
Demonstrated an entangling gate fidelity of 99.69(4)%.
The high fidelities were enabled by the near-optimal single-photon source.

Conclusions:

The demonstrated high-fidelity photon-photon gates are a significant advancement for photonic quantum computing.
This work paves the way for scalable photonic quantum applications.
Near-optimal single-photon sources are key to realizing high-performance photonic quantum technologies.