Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 44: Quantum information: Photons and nonclassical light II

Q 44.5: Talk

Thursday, March 20, 2014, 15:00–15:15, UDL HS3038

Beating the One-Half Limit of Linear-Optics Bell Measurements with unentangled Ancillae — •Fabian Ewert and Peter van Loock — Institut für Physik, Johannes Gutenberg Universität Mainz, Staudingerweg 7, 55128 Mainz

Bell measurements are fundamental building blocks in various quantum algorithms, such as quantum teleportation. It is well known, that the discrimination of the Bell states is possible with a probability of 50% at best, when using only passive linear optics and arbitrarily many vacuum mode ancillae. By adding unentangled single-photon ancillae, we are able to surpass this limit and reach a success probability of 75%. We discuss the error robustness of the proposed scheme and a generalisation to reach a success probability arbitrarily close to 100%.