Quantum process tomography of linear and quadratically nonlinear optical systems

A central task in quantum information processing is to characterize quantum processes. In the realm of optical quantum information processing, this amounts to characterizing the transformations of the mode creation and annihilation operators. This transformation is unitary for linear optical systems...

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Bibliographic Details
Published in:arXiv.org 2018-07
Main Authors: Jacob, Kevin Valson, Mirasola, Anthony E, Adhikari, Sushovit, Dowling, Jonathan P
Format: Article
Language:English
Subjects:
Data processing
Information processing
Mach-Zehnder interferometers
Nonlinear systems
Operators
Photons
Quantum phenomena
Quantum theory
Transformations
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Summary:A central task in quantum information processing is to characterize quantum processes. In the realm of optical quantum information processing, this amounts to characterizing the transformations of the mode creation and annihilation operators. This transformation is unitary for linear optical systems, whereas these yield the well-known Bogoliubov transformations for systems with Hamiltonians that are quadratic in the mode operators. In this paper, we show that a modified Mach-Zehnder interferometer can characterize both these kinds of evolutions for multimode systems. While it suffices to use coherent states for the characterization of linear optical systems, we additionally require single photons to characterize quadratically nonlinear optical systems.
ISSN:2331-8422
DOI:10.48550/arxiv.1801.10558