Complementarity reveals bound entanglement of two twisted photons
- Autor(en)
- Beatrix C. Hiesmayr, Wolfgang Löffler
- Abstrakt
We demonstrate the detection of bipartite bound entanglement as predicted by the Horodecki's in 1998. Bound entangled states, being heavily mixed entangled quantum states, can be produced by incoherent addition of pure entangled states. Until 1998 it was thought that such mixing could always be reversed by entanglement distillation; however, this turned out to be impossible for bound entangled states. The purest form of bound entanglement is that of only two particles, which requires higher-dimensional (d > 2) quantum systems. We realize this using photon qutrit (d = 3) pairs produced by spontaneous parametric downconversion, that are entangled in the orbital angular momentum degrees of freedom, which is scalable to high dimensions. Entanglement of the photons is confirmed via a 'maximum complementarity protocol'. This conceptually simple protocol requires only maximized complementary of measurement bases; we show that it can also detect bound entanglement. We explore the bipartite qutrit space and find that, also experimentally, a significant portion of the entangled states are actually bound entangled.
- Organisation(en)
- Teilchenphysik
- Externe Organisation(en)
- Leiden University
- Journal
- New Journal of Physics
- Band
- 15
- Anzahl der Seiten
- 15
- ISSN
- 1367-2630
- DOI
- https://doi.org/10.1088/1367-2630/15/8/083036
- Publikationsdatum
- 08-2013
- Peer-reviewed
- Ja
- ÖFOS 2012
- 103036 Theoretische Physik, 103009 Festkörperphysik, 103025 Quantenmechanik
- Schlagwörter
- Link zum Portal
- https://ucris.univie.ac.at/portal/de/publications/complementarity-reveals-bound-entanglement-of-two-twisted-photons(abcb2655-91ca-4f52-9682-2fc4d25d0210).html