Physics – Quantum Physics
Scientific paper
2007-03-14
Phys. Rev. A 75, 060305(R) (2007)
Physics
Quantum Physics
typos corrected, to appear in PRA, 5 pages, 2 figures, 2 tables
Scientific paper
10.1103/PhysRevA.75.060305
It is known that it is impossible to unambiguously distinguish the four Bell states encoded in pairs of photon polarizations using only linear optics. However, hyperentanglement, the simultaneous entanglement in more than one degree of freedom, has been shown to assist the complete Bell analysis of the four Bell states (given a fixed state of the other degrees of freedom). Yet introducing other degrees of freedom also enlarges the total number of Bell-like states. We investigate the limits for unambiguously distinguishing these Bell-like states. In particular, when the additional degree of freedom is qubit-like, we find that the optimal one-shot discrimination schemes are to group the 16 states into 7 distinguishable classes, and that an unambiguous discrimination is possible with two identical copies.
Barreiro Julio T.
Kwiat Paul G.
Wei Tzu-Chieh
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