Go and return propagation of biphotons in fibre and polarization entanglement
G. Brida, Marco Genovese, Leonid A. Krivitsky, Maria V. Chekhova, E. Predazzi · Journal of Physics A Mathematical and Theoretical · 2007
Propagation of entangled photons in optical fibre is one of the fundamental issues for realizing quantum communication protocols. When entanglement in polarization is considered, a problem of compensating for the fibre effect on photons polarization arises. In this paper, we demonstrate an effective solution where a Faraday mirror allows us to cancel undesired effects of polarization drift in fibre. This technique is applied to a protocol for generating Bell states by a narrow temporal selection of the second-order intensity correlation function.