Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 27: Symposium: Circuit QED

TT 27.8: Vortrag

Donnerstag, 28. Februar 2008, 12:30–12:45, H 0104

Quantum Zeno Effect in Detection of Itinerant Microwave Photons — •Ferdinand Helmer¹, Matteo Mariantoni², Enrique Solano¹, and Florian Marquardt¹ — ¹Arnold Sommerfeld Center for Theoretical Physics, Department für Physik, Center for NanoScience, Ludwig-Maximilians-Universität Müunchen, Germany — ²Walther Meissner Institut, Bayerische Akademie der Wissenschaften, Garching b. München, Germany

We propose and analyze a scheme for detecting single microwave photons traveling along a superconducting transmission line on a chip. The setup exploits a nonlinear coupling between different modes in a transmission line resonator, brought about by the interaction with a superconducting qubit (as demonstrated in recent experiments). The backaction produced by the measurement device may produce a fundamental limit for the fidelity of photon detection in any such scheme. This is a consequence of the Quantum Zeno effect, and we discuss both analytical estimates and quantum trajectory simulations of the measurement process.