Speaker
Prof.
Mohamed Bourennane
(Stockholm University, Sweden)
Description
Multiphoton entanglement is the basis of many quantum
communication schemes, quantum cryptographic protocols,
and fundamental tests of quantum theory. Spontaneous
parametric down-conversion is the most effective source for
polarization entangled photon pairs. I show that a class of
entangled 6-photon states can be directly created by
parametric down-conversion. These states exhibit perfect
quantum correlations and a high robustness of
entanglement against photon loss. Therefore these states
are well suited for new types of quantum communication.
Bound entanglement is one of the most puzzling forms of
entanglement. Being a peculiar form of entanglement,
bound entanglement emerges in certain mixed quantum
states. This form of entanglement is not distillable by local
operators and classical communication. Bound entangled
states are different from both the free entangled (distillable)
and separable states. I report on the experimental evidence
of the existence of bound entangled state, the so-called
Smolin state.
