Darmstadt 2008 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 41: Quanteninformation (Konzepte und Methoden III)
Q 41.6: Talk
Thursday, March 13, 2008, 15:15–15:30, 1B
Entanglement Quantum Nondemolition Measurement — Bruno de Moura Escher1, •Fernando de Melo2, Ruynet L. de Matos Filho1, Andreas Buchleitner2, and Luiz Davidovich1 — 1Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, Rio de Janeiro RJ 21941-972, Brazil — 2Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Strasse 3, D-79104 Freiburg, Germany
We present a quantum circuit which allows for the nondemolition measurement of a two-qubit system. The protocol employs two simultaneous copies of the state, in order to give an operational meaning to the entanglement measure, an can thus be applied for all pure states. The complementarity relation between single particle characteristics and bipartite entanglement is scrutinized in the light of the proposed measurement.