Experimental position-time entanglement with degenerate single photons

2007/09/30 by A. J. Bennett, David Gevaux, D. G. Gevaux +5 · 1 citation
Computer Science · Engineering · Physics and Astronomy · #Photonic and Optical Devices #Quantum Information and Cryptography #Quantum Mechanics and Applications #cond-mat.other #quant-ph

paper · pdf · doi:10.1103/physreva.77.023803

published as Phys. Rev. A 77, 023803 (2008) · Updated to published version, new fig. 4., corrected typos

openalex publication_date 2008/02/05 · arxiv created 2008/02/06 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We report an experiment in which two-photon interference occurs between degenerate single photons that never meet. The two photons travel in opposite directions through our fiber-optic interferometer and interference occurs when the photons reach two different, spatially separated, two-by-two couplers at the same time. We show that this experiment is analogous to the conventional Franson-type entanglement experiment where the photons are entangled in position and time. We measure wave-function overlaps for the two photons as high as 94\ifmmode±\else\textpm\fi3%.

Citations

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