Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 29: Poster Session: Quantum Information Systems, Quantum Coherence (jointly with SAMOP)

TT 29.7: Poster

Tuesday, March 15, 2011, 18:00–21:00, P1

Dual-path state reconstruction scheme for propagating quantum microwaves — Edwin P. Menzel¹, Frank Deppe¹, •Peter Eder¹, Matteo Mariantoni¹, Miguel Angel Araque Caballero¹, Alexander Baust¹, Thomas Niemczyk¹, Elisabeth Hoffmann¹, Achim Marx¹, Rudolf Gross¹, Enrique Solano², Kunihiro Inomata³, Tsuyoshi Yamamoto^3,4, and Yasunobu Nakamura^3,4 — ¹Walther-Meissner-Institut and TU München, Garching, Germany — ²Universidad del Pais Vasco and Ikerbasque Foundation, Bilbao, Spain — ³RIKEN, Wako, Japan — ⁴NEC Corporation, Tsukuba, Japan

Weak propagating microwave signals on the quantum level can be characterized using two amplification chains and suitable correlations between their outputs. In such a dual path setup all quadrature moments of an input signal can be determined, although the noise added by each individual amplifier chain can be larger than the microwave signal to be measured [E.P. Menzel et al., PRL 105, 100401 (2010)]. This allows for a full quantum tomography of propagating microwaves. As a possible application of the dual-path method, we discuss detecting squeezed states generated by a superconducting Josephson parametric amplifier or other circuit QED setups.

This work is supported by SFB 631, NIM, Basque Government IT4720-10, Spanish MICINN FIS2009-12773-C02-01, and EU project SOLID.