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Fiber-optic realization of anisotropic depolarizing quantum channels

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arxiv 0707.3728 v2 pith:IVAXNFNH submitted 2007-07-25 quant-ph physics.optics

Fiber-optic realization of anisotropic depolarizing quantum channels

classification quant-ph physics.optics
keywords channelsphotonsquantumanisotropicdepolarizingfiber-opticpolarizationprocess
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 down-conversion. 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.

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  1. The Geometry of Quantum Complexity in Open Systems

    quant-ph 2026-07 accept novelty 7.0

    Nielsen complexity for Lindbladian open systems induces a sub-Finslerian geometry on mixed states whose flag curvature depends on control penalty factors.