Abstract
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 generate and characterize such an invariant six-photon polarization entangled state. This is done solely with a suitable filtering procedure of triple emissions of entangled photon pairs from a single source, without any need for interferometric overlaps [1,2], Surprisingly, the process is not entirely spontaneous, as we get the right state utilizing bosonic emission enhancement due to indistinguishability. The single source setup is very stable, and we observe six-photon high visibility interference due to entanglement. These features make the demonstrated process a very likely candidate for implementations of advanced photonic quantum information processes.
© 2009 IEEE
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