Transport of Entanglement

TL;DR

This paper demonstrates that entanglement of photon pairs degrades during propagation in a random medium, by deriving an equation similar to classical radiative transport for the two-photon Wigner distribution.

Contribution

It introduces a novel equation governing the two-photon wave function in random media, linking quantum entanglement decay to classical transport theory.

Findings

Entanglement diminishes as photons propagate through random media.

The Wigner distribution follows an equation analogous to classical radiative transport.

Entanglement loss can be predicted using this transport equation.

Abstract

We consider the propagation of two-photon light in a random medium. We show that the Wigner distribution of the two-photon wave function obeys an equation that is analogous to the radiative transport equation for classical light. Using this result, we predict that the entanglement of a photon pair is destroyed with propagation.