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Research in Optical Sciences

Controlled Decoherence of Quantum Systems

Assaf Shaham, H. S. Eisenberg

Published Jan 1, 2014• 0 citations
Publisher

Abstract

The transition between quantum to classical systems is studied by applying decoherence to polarized photonic states. We show how to control the depolarization quantum process, and its effect on various quantum states.
DOI
10.1364/qim.2014.qw3b.1

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We employed an electrically driven polarization controller to implement anisotropic depolarizing quantum channels for the polarization state of single photons. The channels were characterized by means of ancilla-assisted quantum process tomography using polarization-entangled photons generated in the process of spontaneous parametric downconversion. The demonstrated depolarization method offers good repeatability, low cost, and compatibility with fiber-optic setups. It does not perturb the modal structure of single photons, and therefore can be used to verify experimentally protocols for managing decoherence effects based on multiphoton interference.