Dual-path state reconstruction scheme for propagating quantum microwaves and detector noise tomography.
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.
Menzel
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Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, D-85748 Garching, Germany. Edwin.Menzel@wmi.badw-muenchen.de
Deppe
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F
Mariantoni
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M
Araque Caballero
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MA
Baust
A
A
Niemczyk
T
T
Hoffmann
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Marx
A
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Solano
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E
Gross
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