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Bulletin of the American Physical Society

A Universal Quantum Gate Set Operating on Itinerant Microwave Photons

Kevin Reuer, Jean-Claude Besse, Lucien Wernli, Paul Magnard, Philipp Kurpiers, Andreas J. Wallraff, Christopher Eichler

Published Mar 19, 2021• 0 citations
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Detecting an itinerant microwave photon with high efficiency is an outstanding problem in microwave photonics and its applications. We present a scheme to detect an itinerant microwave photon in a transmission line via the nonlinearity provided by a transmon in a driven microwave resonator. With a single transmon we achieve 84% distinguishability between zero and one microwave photons and 90% distinguishability with two cascaded transmons by performing continuous measurements on the output field of the resonator. We also show how the measurement diminishes coherence in the photon number basis thereby illustrating a fundamental principle of quantum measurement: The decoherence rate increases as the detector is made more effective.