Hamburg 2009 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 56: Poster IV
Q 56.35: Poster
Donnerstag, 5. März 2009, 16:30–19:00, VMP 9 Poster
Applications of a symmetric quantum cloning machine producing high-fidelity copies for selected regions of the bloch sphere — •Michael Siomau1 and Stephan Fritzsche1,2,3 — 1Max-Planck-Institut für Kernphysik, Postfach 103980, D-69117 Heidelberg, Germany — 2Gesellschaft für Schwerionenforschung, D-64291 Darmstadt, Germany — 3Frankfurt Institute for Advanced Studies, D-60438 Frankfurt am Main, Germany
Quantum cloning transformation is utilized to provide copies (i.e. outputs) of unknown input states. While is impossible to provide perfect cloning [1], one can produce copies with certain fidelity compared with input. A cloning transformation is called symmetric if the output states are equal value. In this work we discuss how a symmetric cloning transformation can be applied in quantum data transmission and quantum cryptography. For this purpose, we examine the universal and state-dependent transformations and discuss advantages. Emphasis is placed on problems to be solved.
[1] W.K. Wooters and W.H. Zurek, Nature London 299, 802 (1982)