Non-absorbing high-efficiency counter for itinerant microwave photons

Abstract

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 higher the measurement efficiency, the faster is the decoherence.

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• Propagating Quantum Microwaves: Towards Applications in Communication and Sensing
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• Dressed-state engineering for continuous detection of itinerant microwave photons
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• Single-photon limit of dispersive readout of a qubit with a photodetector
• Imperfect photon detection in quantum illumination
• Quantum limits on noise for a class of nonlinear amplifiers
• A superconducting detector that counts microwave photons up to two
• Parity measurement of remote qubits using dispersive coupling and photodetection
• Optimal conditions for high-fidelity dispersive readout of a qubit with a photon-number-resolving detector
• Measurement-induced entanglement of two transmon qubits by a single photon
• Sequential nonabsorbing microwave single-photon detector
• Wigner-function formalism for the detection of single microwave pulses in a resonator-coupled double quantum dot
• Stroboscopic detection of itinerant microwave photons