Regensburg 2007 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 28: Transport - Poster Session

TT 28.26: Poster

Thursday, March 29, 2007, 14:00–17:45, Poster A

On-Chip Detection of Single Microwave Photons in Super-Conducting Circuit QED — •Ferdinand Helmer¹, Matteo Mariantoni², Florian Marquardt¹, and Enrique Solano¹ — ¹Arnold Sommerfeld Center for Theoretical Physics, Department für Physik, Center for NanoScience, Ludwig-Maximilians-Universität München, 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). Remarkably, 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.