Characterization of Spectral Entanglement of Spontaneous Parametric-Down Conversion Biphotons

Abstract

We verified operational approach based on direct measurement of entanglement degree for bipartite systems. In particular spectral distributions of single counts and coincidence for pure biphoton states generated by train of short pump pulses have been measured and entanglement quantifier calculated. The approach gives upper bound of entanglement stored in total biphoton states, which can reach extremely high value up to $10^4-10^5$.

References in corpus (2)

• Tomographic reconstruction of the single-photon Fock state by high-frequency homodyne detection
• Control, measurement and propagation of entanglement in photon pairs generated through type-II parametric downconversion