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Phys. Rev. Lett. 105, 100401 (2010) [4 pages]

Dual-Path State Reconstruction Scheme for Propagating Quantum Microwaves and Detector Noise Tomography

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E. P. Menzel1,2,*, F. Deppe1,2, M. Mariantoni1,2,†, M. Á. Araque Caballero1,2, A. Baust1,2, T. Niemczyk1,2, E. Hoffmann1,2, A. Marx1, E. Solano3,4, and R. Gross1,2
1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, D-85748 Garching, Germany
2Physik-Department, Technische Universität München, D-85748 Garching, Germany
3Departamento de Química Física, Universidad del País Vasco-Euskal Herriko Unibertsitatea, Apartado 644, 48080 Bilbao, Spain
4IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain

Received 11 March 2010; revised 21 July 2010; published 31 August 2010

Quantum state reconstruction of weak propagating microwaves to date requires the use of linear amplifiers. We introduce a theory which, even in the presence of significant amplifier noise, allows one to use these devices for measuring all quadrature moments of propagating quantum microwaves based on cross correlations from a dual-path amplification setup. Simultaneously, the detector noise properties are determined, allowing for tomography. We demonstrate the feasibility of our novel concept by proof-of-principle experiments with classical mixtures of weak coherent microwaves.

© 2010 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.105.100401
DOI:
10.1103/PhysRevLett.105.100401
PACS:
03.65.Wj, 07.57.Kp

*Edwin.Menzel@wmi.badw-muenchen.de

†Present address: Department of Physics, University of California, Santa Barbara, California 93106, USA.

 
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