The Mean King's Problem: Experimental Realization
Abstract
In the Mean King's Problem a ship-wrecked physicist is challenged to infer the outcome of an intermediate spin measurement by a suitable preparation in conjunction with an appropriate control measurement -- the 1987 spin retrodiction puzzle of Vaidman, Aharonov, and Albert. 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 states. 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%.Keywords
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