1,104 research outputs found
Ascertaining the Values of , , and of a Polarization Qubit
In the 1987 spin retrodiction puzzle of Vaidman, Aharonov, and Albert one is
challenged to ascertain the values of , , and of
a spin-1/2 particle by utilizing entanglement. We report the experimental
realization of a quantum-optical version in which the outcome of an
intermediate polarization projection is inferred by exploiting single-photon
two-qubit quantum gates. The experimental success probability is consistently
above the 90.2% threshold of the optimal one-qubit strategy, with an average
success probability of 95.6%.Comment: 4 pages, 2 figures; final version with new title and new abstract; to
appear in Physical Review Letter
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