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Invariant multiqubit entangled states, remaining unchanged under simultaneous identical unitary transformations of all their individual constituents, can be applied for decoherence-free encoding, quantum communication without sharing a common reference frame, telecloning and secret sharing. They also have properties which are interesting in studies of foundations of quantum mechanics. We experimentally...
Spontaneous parametric downconversion in combination with linear optics was successfully used to observe a variety of multiphoton entangled states. Yet, experiments performed so far lacked flexibility, as each of the various setups was useful for only a particular multiphoton entangled state. In this paper, we describe how, by using multiphoton interference, one can observe entire families of multiphoton...
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