Darmstadt 2008 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

Q: Fachverband Quantenoptik und Photonik

Q 41: Quanteninformation (Konzepte und Methoden III)

Q 41.6: Vortrag

Donnerstag, 13. März 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.