Implementation of controllable universal unital optical channels

A. Shaham*, T. Karni, H. S. Eisenberg

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


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.

Original languageAmerican English
Pages (from-to)23839-23848
Number of pages10
JournalOptics Express
Issue number17
StatePublished - 19 Aug 2019

Bibliographical note

Publisher Copyright:
© 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement


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