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TT: Fachverband Tiefe Temperaturen

TT 13: Transport: Poster Session

TT 13.43: Poster

Monday, March 26, 2012, 15:00–19:00, Poster B

The Back Action of Josephson Photomultipliers — •Luke C.G. Govia^1,2, Emily J. Pritchett², Seth T. Merkel², Deanna Pineau³, and Frank K. Wilhelm² — ¹Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, Ontario, Canada — ²Theoretical Physics, Universität des Saarlandes, Saarbrücken, Germany — ³Department of Physics and Astronomy, University of Victoria, British Columbia, Canada

We describe the Josephson photomultiplier, a photon counter applicable to circuit QED. We show that its backaction is described by the regular photon annihilation operator at short interaction times and approaches a variant of the photon subtraction operator at long times. Understanding this backaction opens the opportunity to use multiplexed photomultipliers for, e.g., state tomography with few preparations.