Dual-path state reconstruction scheme for propagating quantum microwaves and detector noise tomography

Details Dual-path state reconstruction scheme for propagating quantum microwaves and detector noise tomography Dual-path state reconstruction scheme for propagating quantum microwaves and detector noise tomography

2010-01-20

arxiv.org/abs/1001.3669v2

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

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.105.100401

Quantum state reconstruction involves measurement devices that are usually described by idealized models, but not known in full detail in experiments. For weak propagating microwaves, the detection process requires linear amplifiers which obscure the signal with random noise. Here, we introduce a theory which nevertheless 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.

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