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Physicists Achieve 95% Accuracy in Reversing Photon States

10/27/2025

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Summary

Story summary

Physicists at the University of Vienna, led by Philip Walther (University of Vienna), rewound a single photon's state with over ninety-five percent accuracy, a breakthrough for preserving quantum coherence.
The reversal relies on a quantum switch that orchestrates operations canceling forward evolution without direct measurement.
The protocol can be retried to increase reliability, strengthening its potential for quantum technology.
The findings were published in Optica.

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Story summary

Physicists at the University of Vienna, led by Philip Walther (University of Vienna), rewound a single photon's state with over ninety-five percent accuracy, a breakthrough for preserving quantum coherence.
The reversal relies on a quantum switch that orchestrates operations canceling forward evolution without direct measurement.
The protocol can be retried to increase reliability, strengthening its potential for quantum technology.
The findings were published in Optica.