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Q: Fachverband Quantenoptik und Photonik

Q 13: Quanteninformation: Konzepte III

Q 13.3: Vortrag

Montag, 2. März 2009, 17:00–17:15, VMP 6 HS-D

Detector-level entanglement of identical particles — •Malte Christopher Tichy¹, Fernando de Melo¹, Florian Mintert¹, Marek Kuś², and Andreas Buchleitner¹ — ¹Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg im Breisgau — ²Center for Theoretical Physics, Polish Academy of Sciences, Aleja Lotników 32/46, 02-668 Warszawa, Poland

We study the impact of the (anti)symmetrization of the wave function of two identical bosons (fermions) on the entanglement measured at two spatially separated detectors.

Ambiguous spatial detector settings induce uncertainty on the outcome of spin-measurements of two spatially overlapping particles. We show that this uncertainty manifests itself as classical entropy in the case of distinguishable particles and as entanglement in the case of identical particles. We explore the transition between distinguishable and indistinguishable particles by tuning of the effective indistinguishability, a quantity which depends on the physical arrangement of the detectors. Due to two-particle interference, initially entangled particles may gain or loose correlations when detected in a certain setting and show strong quantum statistical effects.