Theory of Josephson photomultipliers: Optimal working conditions and back action
Luke C. G. Govia, Emily J. Pritchett, Seth T. Merkel, Deanna Pineau, Frank K. Wilhelm
DOI 10.1103/PhysRevA.86.032311 · Physical Review A
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Abstract
We describe the back action of microwave-photon detection via a Josephson photomultiplier (JPM), a superconducting qubit coupled strongly to a high-quality microwave cavity. The back-action operator depends qualitatively on the duration of the measurement interval, resembling the regular photon annihilation operator at short interaction times and approaching a variant of the photon subtraction operator at long times. The optimal operating conditions of the JPM differ from those considered optimal for processing and storing of quantum information, in that a short T2 of the JPM suppresses the cavity dephasing incurred during measurement. Understanding this back action opens the possibility of performing multiple JPM measurements on the same state, hence performing efficient state tomography.
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