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Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 23: TR: Quantum Coherence and Quantum Information Systems 2

TT 23.9: Talk

Wednesday, March 24, 2010, 16:30–16:45, H18

Dual-path measurements of propagating microwave signals at the quantum level for circuit QED — •Edwin P. Menzel1, Matteo Mariantoni1, Frank Deppe1, Miguel Angel Araque Caballero1, Alexander Baust1, Elisabeth Hoffmann1, Thomas Niemczyk1, Achim Marx1, Rudolf Gross1, Enrique Solano2, Kunihiro Inomata3, Tsuyoshi Yamamoto3,4, and Yasunobu Nakamura3,41Walther-Meissner-Institut and TU München, Garching, Germany — 2Universidad del Pais Vasco and Ikerbasque Foundation, Bilbao, Spain — 3RIKEN, Wako, Japan — 4NEC Corporation, Tsukuba, Japan

Few-photon propagating microwave signals can be characterized by means of a beam splitter and two amplification chains. We show that such a setup is robust against random noise added by the amplifiers. Even if this noise is much larger than the signal itself, the first two signal moments and, hence, Gaussian states can be analyzed via correlation measurements. We discuss possible applications of the dual-path method for detecting squeezed states generated by a superconducting Josephson parametric amplifier and in circuit QED setups.

We acknowledge support from SFB631, NIM, UPV/EHU Grant GIU07/40 and European project EuroSQIP.

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