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This research demonstrates that uniform detector motion can actively select the quantum observable by converting photon propagation direction into a detectable signal via Doppler shift, without inducing decoherence. By leveraging precise temporal correlations to track arrival times, the study provides a method to measure single-photon directionality while preserving quantum information. This breakthrough offers a novel pathway for refining measurement techniques in quantum optics and developing new photonic technologies that rely on dynamic detection schemes.

Surse care acoperăQuantum Zeitgeist, arXiv

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Moving Detectors Reveal Photon Direction Without Losing Quantum Coherence

Quantum Zeitgeist23 mai 20267 min de cititArticolul și perspectiva sunt în engleză.

Until now, photodetection has assumed a stationary instrument, but uniform motion fundamentally alters what a detector ‘sees’. This work demonstrates a crossover from measuring a photon’s phase to sensing its direction of travel, determined by the Doppler shift relative to the detector’s bandwidth. This transition offers a means to actively select the quantum observable realised by photodetection.

Mohamed Hatifi shows that uniform motion changes the measurement of single photons, introducing a directional bias without losing quantum information. The work reveals how a detector’s motion Doppler-shifts photon properties and converts the direction of photon propagation into a detectable signal. Understanding this phenomenon is a key step towards new photonic technologies and refined measurement techniques in quantum optics Precise temporal correlation was employed to carefully track individual photon detections, revealing the subtle influence of detector movement. Analysing the arrival times of photons with a resolution exceeding the detector’s transit time allowed for a detailed timeline of each detection event. A Glauber detector, a highly sensitive light sensor akin to a specialised camera designed to capture individual particles of light, was deliberately set in uniform motion…

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