First proof of bipartite BOUND entanglement with two twisted photons


In a Leiden-Vienna collaboration the first experiment was designed to prove bipartite bound entanglement [1].



This was possible because of a couple of pre-works in our group such as a simple entanglement witness based on mutually unbiased bases [2] and the magic simplex [3].

[1] B.C. Hiesmayr and W. Löffler, "Complementarity Reveals Bound Entanglement of Two Twisted Photon", New J. Phys. 15, 083036 (2013)

[2] C. Spengler, M. Huber, S. Brierley, T. Adaktylos and B.C. Hiesmayr, "Entanglement detection via mutually unbiased bases", Phys. Rev. A 86, 022311 (2012).

[3] Be. Baumgartner, B. C. Hiesmayr and H. Narnhofer, "The state space for two qutrits has a phase space structure in its core", Phys. Rev. A 74, 032327 (2006.