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Observation of bosonic coalescence of photon pairs

Giovanni Di Giuseppe, Mete Atature, Matthew D. Shaw, Alexander V. Sergienko, Bahaa E. A. Saleh, Malvin C. Teich, Aaron J. Miller, Sae Woo Nam, John Martinis

quant-pharXiv:quant-ph/0306131

Abstract

Quantum theory predicts that two indistinguishable photons incident on a beam-splitter interferometer stick together as they exit the device (the pair emerges randomly from one port or the other). We use a special photon-number-resolving energy detector for a direct loophole-free observation of this quantum-interference phenomenon. Simultaneous measurements from two such detectors, one at each beam-splitter output port, confirm the absence of cross-coincidences.

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