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Third- and fourth-order coherences measured with a multi-element superconducting nanowire single-photon detector | NIST

Martin J. Stevens, Burm Baek, Eric A. Dauler, Andrew J. Kerman, R. J. Molnar, Scott A. Hamilton, Karl K. Berggren, Richard P. Mirin, Sae Woo Nam

Published May 29, 2009• 0 citations
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We demonstrate a new approach to measuring high-order temporal coherences that uses a four-element superconducting nanowire single-photon detector. The four independent, interleaved single-photon-sensitive elements parse a single spatial mode of an optical beam over dimensions smaller than the minimum diffraction-limited spot size. Integrating this device with four-channel time-tagging electronics to generate multi-start, multi-stop histograms enables measurement of temporal coherences up to fourth order for a continuous range of all associated time delays. We observe high-order photon bunching from a chaotic, pseudo-thermal light source, measuring maximum third- and fourth-order coherence values of 5.87 +/- 0.17 and 23.1 +/- 1.8, respectively, in agreement with the theoretically predicted values of 3! = 6 and 4! = 24. Laser light, by contrast, is confirmed to have coherence values of approximately 1 for second, third and fourth orders at all time delays.
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