Dresden 2006 – scientific programme
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TT: Tiefe Temperaturen
TT 32: Transport: Quantum Coherence and Quantum Information Systems - Part 2
TT 32.5: Talk
Thursday, March 30, 2006, 15:00–15:15, HSZ 304
Theory of Microwave Homodyne Tomography of Quantum Signals — •Matteo Mariantoni1, Markus J. Storcz2, Frank K. Wilhelm2, William D. Oliver3, Andreas Emmert1, Achim Marx1, Rudolf Gross1, Henning Christ4, and Enrique Solano4,5 — 1Walther-Meissner-Institut, Walther-Meissner-Str. 8, D-85748 Garching, Germany — 2Department Physik, ASC and CeNS, Ludwig-Maximilians-Universität, Theresienstr. 37, D-80333 München, Germany — 3MIT Lincoln Laboratory, 244 Wood Street, Lexington, Massachussets 02420, USA — 4Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany — 5Sección Física, Departamento de Ciencias, Pontificia Universidad Católica del Perú, Apartado 1761, Lima, Peru.
Weak quantum signals cannot be detected using standard ultra-low-noise cryogenic amplifiers or the state-of-the-art available classical methods. As a consequence, the measurement of nonclassical states of microwave electromagnetic radiation is a fundamental problem and necessity in the novel field of circuit QED [1] (see TT 19, E. Solano).
We propose a microwave quantum homodyne detection technique that enables the measurement of quantum states at the level of single photons and allows the reconstruction of their Wigner function through microwave quantum homodyne tomography. Our method is based on a superconducting hybrid ring acting as an on-chip microwave beam splitter (see also presentation TT 19, A. Emmert). This work was supported by the SFB 631 of the DFG.
[1] M. Mariantoni et al., cond-mat/0509737.