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7 papers · 2 filters
Pentagrams and paradoxes
Piotr Badziag, Ingemar Bengtsson, Adan Cabello +2
Klyachko and coworkers consider an orthogonality graph in the form of a pentagram, and in this way derive a Kochen-Specker inequality for spin 1 systems. In some low-dimensional si…
State-independent quantum contextuality with single photons
Elias Amselem, Magnus Radmark, Mohamed Bourennane +1
We present an experimental state-independent violation of an inequality for noncontextual theories on single particles. We show that 20 different single-photon states violate an in…
Experimental high fidelity six-photon entangled state for telecloning protocols
Magnus Radmark, Marek Zukowski, Mohamed Bourennane
We experimentally generate and characterize a six-photon polarization entangled state, which is usually called "Psi 6 +". This is realized with a filtering procedure of triple emis…
Relative quantum phase, -tangle, and multi-local Lorentz-group invariant
Hoshang Heydari
In this paper we establish a relation between quantum relative phase, -tangle, and multi-local Lorentz-group invariant or -invariant .…
`Classical' quantum states
Marek Kuś, Ingemar Bengtsson
We show that several classes of mixed quantum states in finite-dimensional Hilbert spaces which can be characterized as being, in some respect, 'most classical' can be described an…
Experimental filtering of two-, four-, and six-photon singlets from single PDC source
Magnus Radmark, Marcin Wiesniak, Marek Zukowski +1
Invariant entangled states remain unchanged under simultaneous identical unitary transformations of all their subsystems. We experimentally generate and characterize such invariant…