We study the high-dimensional entanglement of a photon pair transmitted through a random medium. We show that multiple scattering in combination with the subsequent selection of only a fraction of outgoing modes reduces the average entanglement of an initially maximally entangled two-photon state. Entanglement corresponding to a random pure state is obtained when the number of modes accessible in transmission is much lower than the number of modes in the incident light. An amount of entanglement approaching that of the incident light can be recovered by accessing a larger number of transmitted modes. In contrast, a pair of photons in a separable state does not gain any entanglement when transmitted through a random medium.
EPL (Europhysics Letters)
- Pub Date:
- September 2014
- Condensed Matter - Disordered Systems and Neural Networks;
- Physics - Optics;
- Quantum Physics
- 6 pages, 2 figures. Text slightly revised