Ascertaining the Values of $σ_x$, $σ_y$, and $σ_z$ of a Polarization Qubit

Details Ascertaining the Values of $σ_x$, $σ_y$, and $σ_z$ of a Polarization Qubit Ascertaining the Values of $σ_x$, $σ_y$, and $σ_z$ of a Polarization Qubit

2002-09-24

arxiv.org/abs/quant-ph/0209127v2

Physical Review Letters, vol. 90, art. 177901 (2003)

Physics

Quantum Physics

4 pages, 2 figures; final version with new title and new abstract; to appear in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.90.177901

In the 1987 spin retrodiction puzzle of Vaidman, Aharonov, and Albert one is challenged to ascertain the values of $\sigma_x$, $\sigma_y$, and $\sigma_z$ 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%.

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