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Related Experiment Video

Updated: May 4, 2026

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-speed linear optics quantum computing using active feed-forward.

Robert Prevedel¹, Philip Walther, Felix Tiefenbacher

¹Institute for Experimental Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria. robert.prevedel@univie.ac.at

|January 5, 2007

Summary

This summary is machine-generated.

Researchers demonstrate a novel feed-forward technique for one-way quantum computing. This method enhances the fidelity of photonic qubit operations, paving the way for faster, more reliable quantum computers.

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Last Updated: May 4, 2026

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Area of Science:

Quantum Computing
Quantum Information Science
Photonics

Background:

Photonic qubits offer low decoherence but lack photon-photon interaction for two-qubit gates.
Probabilistic gate operations via measurement-induced nonlinearity are a workaround.
One-way quantum computation relies on cluster states and requires error correction.

Purpose of the Study:

To implement and test a concatenated measurement and active feed-forward scheme in a one-way quantum computing experiment.
To address random quantum measurement errors in one-way quantum computation.
To improve the fidelity and speed of quantum gate operations using photonic qubits.

Main Methods:

Utilized a concatenated scheme of measurement and active feed-forward.
Employed electro-optical modulators for high-speed feed-forward operations.
Focused on experiments with a perfect cluster state and minimal photon loss.

Main Results:

Demonstrated good operational fidelity for the quantum computation scheme under ideal conditions.
Showcased high-speed and low-error performance of feed-forward components for detected photons.
Achieved individual computational steps (feed-forward cycles) in under 150 ns.

Conclusions:

The developed feed-forward technique is crucial for deterministic one-way quantum computation.
The speed and low error rate of the components are significant for future quantum computer development.
Advances in cluster state generation and detection are key for large-scale one-way quantum computers.