Direct measure of the Schmidt number of biphotons
Felix Just, Andrea Cavanna, Maria V. Chekhova, Gerd Leuchs · The Rochester Conferences on Coherence and Quantum Optics and the Quantum Information and Measurement meeting · 2013
We implement a method to assess the transverse entanglement of biphotons in both modulus and phase of the quantum state. This is achieved by an interferometric measurement of the Schmidt number which is a universal quantifier for entanglement.