Microwave photon counter based on Josephson junctions |
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Authors: | Chen Y-F Hover D Sendelbach S Maurer L Merkel S T Pritchett E J Wilhelm F K McDermott R |
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Institution: | Department of Physics, University of Wisconsin, Madison, 53706, USA. |
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Abstract: | We describe a microwave photon counter based on the current-biased Josephson junction. The junction is tuned to absorb single microwave photons from the incident field, after which it tunnels into a classically observable voltage state. Using two such detectors, we have performed a microwave version of the Hanbury Brown-Twiss experiment at 4 GHz and demonstrated a clear signature of photon bunching for a thermal source. The design is readily scalable to tens of parallelized junctions, a configuration that would allow number-resolved counting of microwave photons. |
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