Berlin 2012 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 5: Transport: Quantum Coherence and Quantum Information Systems 1 (jointly with MA and HL)
TT 5.11: Talk
Monday, March 26, 2012, 12:15–12:30, BH 243
Backaction of Microwave Photon Detection by a Strongly Coupled Josephson Junction — •Emily Pritchett1, Luke Govia2, Seth Merkel3, and Frank Wilhelm1 — 1Saarland University, Saarbrucken, Deutschland — 2University of Waterloo, Waterloo, Canada — 3IBM Watson Research Center, Yorktown Heights, USA
We analyze the functionality of on-chip Josephson junctions as single microwave photon detectors, as has been demonstrated recently [1]. The Josephson junction device, which we refer to as a Josephson Photomultiplier (JPM), acts as a nearly perfect binary detectors of microwave photons by undergoing an observable switching event when there are one or more photons in an incident cavity. We analyze the backaction of this switching event on the state of incident light, including the energy dissipation and dephasing affecting an imperfect JPM. This analysis improves the efficiency and fidelity with which a JPM reconstructs the state of light in an incident transmission line ‘cavity’, which are commonly used to store and transfer quantum states in implementations of circuit-QED.
Chen et al., arXiv:1011.4329