Quantum Beat of Two Single Photons

2004/06/15 by Thomas Legero, Tatjana Wilk, Markus Hennrich +2 · 39 citations
Computer Science · Physics and Astronomy · #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum optics and atomic interactions #quant-ph

paper · pdf · doi:10.1103/physrevlett.93.070503

published as Phys. Rev. Lett. 93, 070503 (2004) · 4 pages, 3 figures

arxiv created 2004/06/15 · openalex publication_date 2004/08/13 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30

Abstract

The interference of two single photons impinging on a beam splitter is measured in a time-resolved manner. Using long photons of different frequencies emitted from an atom-cavity system, a quantum beat with a visibility close to 100% is observed in the correlation between the photodetections at the output ports of the beam splitter. The time dependence of the beat amplitude reflects the coherence properties of the photons. Most remarkably, simultaneous photodetections are never observed, so that a temporal filter allows one to obtain perfect two-photon coalescence even for nonperfect photons.

Citations

• Creation of entangled states of distant atoms by interference
• Robust Creation of Entanglement between Ions in Spatially Separate Cavities

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• High-fidelity atomic-state teleportation protocol with non-maximally-entangled states
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Related

• Probing Correlations, Indistinguishability and Entanglement in Microwave Two-Photon Interference
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