Characterizing quantum microwave radiation and its entanglement with superconducting qubits using linear detectors
Eichler C, Bozyigit D, Wallraff AJ (2012)
Publication Type: Journal article
Publication year: 2012
Journal
Book Volume: 86
Article Number: 032106
Journal Issue: 3
DOI: 10.1103/PhysRevA.86.032106
Abstract
Recent progress in the development of superconducting circuits has enabled the realization of interesting sources of nonclassical radiation at microwave frequencies. Here, we discuss field quadrature detection schemes for the experimental characterization of itinerant microwave photon fields and their entanglement correlations with stationary qubits. In particular, we present joint state tomography methods of a radiation field mode and a two-level system. Including the case of finite quantum detection efficiency, we relate measured photon field statistics to generalized quasiprobability distributions and statistical moments for one-channel and two-channel detection. We also present maximum-likelihood methods to reconstruct density matrices from measured field quadrature histograms. Our theoretical investigations are supported by the presentation of experimental data, for which microwave quantum fields beyond the single-photon and Gaussian level have been prepared and reconstructed. © 2012 American Physical Society.
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APA:
Eichler, C., Bozyigit, D., & Wallraff, A.J. (2012). Characterizing quantum microwave radiation and its entanglement with superconducting qubits using linear detectors. Physical Review A - Atomic, Molecular, and Optical Physics, 86(3). https://doi.org/10.1103/PhysRevA.86.032106
MLA:
Eichler, Christopher, Deniz Bozyigit, and Andreas J Wallraff. "Characterizing quantum microwave radiation and its entanglement with superconducting qubits using linear detectors." Physical Review A - Atomic, Molecular, and Optical Physics 86.3 (2012).
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