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

Mon, 2011-02-14 20:17 - Daniel Rudolph
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Date: 
2010-08-31
Author(s): 

E. P. Menzel, M. Mariantoni, F. Deppe, M. A. Araque-Caballero, A. Baust, T. Niemzcyk, E. Hoffmann, A. Marx, E. Solano, and R. Gross

Reference: 

Phys. Rev. Lett. 105, 100401 (2010)

URL: 

http://link.aps.org/doi/10.1103/PhysRevLett.105.100401

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.