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Updated: Jul 19, 2026

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

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High-Photon-Loss Threshold Quantum Computing Using GHZ-State Measurements.

Brendan Pankovich¹, Angus Kan¹, Kwok Ho Wan¹

¹ORCA Computing, United Kingdom.

Physical Review Letters

|August 19, 2024

Summary

We developed new fault-tolerant quantum computing architectures using Greenberger-Horne-Zeilinger (GHZ) measurements. These designs improve error suppression for photon loss, offering a resource-efficient path to quantum computation.

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Last Updated: Jul 19, 2026

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Area of Science:

Quantum Computing
Quantum Information Science
Optical Physics

Background:

Achieving fault-tolerant quantum computing is crucial for realizing complex quantum algorithms.
Linear optical architectures face challenges from photon loss and probabilistic gate operations.

Purpose of the Study:

To propose novel fault-tolerant architectures for quantum computing.
To enhance error suppression in linear optical quantum systems.

Main Methods:

Utilizing projective measurements in the Greenberger-Horne-Zeilinger (GHZ) basis.
Developing linear-optical constructions with encoded GHZ-state measurements.
Simulating proposed architectures to assess performance.

Main Results:

Demonstrated high single-photon-loss thresholds for the proposed architectures.
Achieved superior performance compared to existing linear-optical architectures using fusion measurements.
Quantified error suppression against photon loss and probabilistic effects.

Conclusions:

The proposed fault-tolerant architectures offer a resource-efficient approach to quantum computing.
GHZ-basis measurements provide a robust method for error mitigation in photonic systems.
This work advances the development of practical fault-tolerant photonic quantum computers.