Transition from pure-state to mixed-state entanglement by random scattering

Abstract

We calculate the effect of polarization-dependent scattering by disorder on the degree of polarization-entanglement of two beams of radiation. Multi-mode detection converts an initially pure state into a mixed state with respect to the polarization degrees of freedom. The degree of entanglement decays exponentially with the number of detected modes if the scattering mixes the polarization directions and algebraically if it does not.

6 pages including 3 figures

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• Quantum interference and entanglement induced by multiple scattering of light
• Entangled mixed-state generation by twin-photon scattering
• Extreme Test of Quantum Theory with Black Holes
• Degradation of electron-hole entanglement by spin-orbit coupling
• Classification of quantum states of light using random measurements through a multimode fiber