Ascertaining the values of sigma x,sigma y,and sigma z of a polarization qubit |
| |
Authors: | Schulz Oliver Steinhübl Ruprecht Weber Markus Englert Berthold-Georg Kurtsiefer Christian Weinfurter Harald |
| |
Institution: | Sektion Physik, Universit?t München, Schellingstrasse 4, 80799 München, Germany. |
| |
Abstract: | 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%. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|