Entangling many photons that never co-existed" (Students Lectures):
The demonstration of multi-particle entangled states, where entanglement is generated between more than two particles, is crucial for the advancement of quantum information science. I will present our approach in which we generate multi-photon entangled states using only one source of entangled pairs. Even though all the photons do not coexist at any moment in time, we still observe quantum characteristics of multi-photon entanglement i.e., one detected photon exhibits quantum correlations with another photon that will be created only at a later time. Consequently, entangled photon states of larger numbers than before are practically realizable.
References:
[1] E. Megidish, T. Shacham, A. Halevy, L. Dovrat, and H. S. Eisenberg, “Resource Efficient Source of Multiphoton Polarization Entanglement”, PRL 109, 080504 (2012).
[2] E. Megidish, A. Halevy, T. Shacham, T. Dvir, L. Dovrat, H. S. Eisenberg, “Entanglement Between Photons that have Never Coexisted”, http://arxiv.org/abs/1209.4191, to appear in PRL.