Generation of entangled photon pairs using small-coherence-time continuous wave pump lasers.
We address the generation of entangled photon pairs by parametric downconversion from solid state cw lasers with small coherence time. We consider a compact and low-cost setup based on a two-crystal scheme with type-I phase matching. We reconstruct the full density matrix by quantum tomography and analyze in detail the entanglement properties of the generated state as a function of the crystal's length and the coherence time of the pump. We verify the possibility to improve the visibility using a purification protocol based on a compensation crystal.
Cialdi
Simone
S
Instituto Nazionale di Fisica Nucleare (INFN), Sezione di Milano, via Celoria 16, Milano I-20133, Italy. simone.cialdi@mi.infn.it
Castelli
Fabrizio
F
Boscolo
Ilario
I
Paris
Matteo G
MG