Implementation of controllable universal unital optical channels

We show that a configuration of four birefringent crystals and wave-plates can emulate almost any arbitrary unital channel for polarization qubits encoded in single photons, where the channel settings are controlled by the wave-plate angles. The scheme is applied to a single spatial mode and its ope...

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Bibliographic Details
Published inarXiv.org
Main Authors Shaham, A, Karni, T, Eisenberg, H S
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 17.08.2019
Subjects
Photons
Physics - Quantum Physics
Qubits (quantum computing)
Stability
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Summary:We show that a configuration of four birefringent crystals and wave-plates can emulate almost any arbitrary unital channel for polarization qubits encoded in single photons, where the channel settings are controlled by the wave-plate angles. The scheme is applied to a single spatial mode and its operation is independent of the wavelength and the fine temporal properties of the input light. We implemented the scheme and demonstrated its operation by applying a dephasing environment to classical and quantum single-photon states with different temporal properties. The applied process was characterized by a quantum process tomography procedure, and a high fidelity to the theory was observed.
ISSN:2331-8422
DOI:10.48550/arxiv.1908.06341