Volume 102, Number 5, June 2013
|Number of page(s)||5|
|Published online||27 June 2013|
Entanglement witnessing in superconducting beamsplitters
1 Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg - Philosophenweg 19, D-69120 Heidelberg, Germany, EU
2 Department of Physics, University of Basel - Klingelbergstrasse 82, CH-4056 Basel, Switzerland
3 Department of Mathematics, Technische Universität München - D-85748 Garching, Germany, EU
Received: 6 March 2013
Accepted: 31 May 2013
We analyse a large class of superconducting beamsplitters for which the Bell parameter (CHSH violation) is a simple function of the spin detector efficiency. For these superconducting beamsplitters all necessary information to compute the Bell parameter can be obtained in Y-junction setups for the beamsplitter. Using the Bell parameter as an entanglement witness, we propose an experiment which allows to verify the presence of entanglement in Cooper pair splitters.
PACS: 03.65.Ud – Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.) / 74.78.-w – Superconducting films and low-dimensional structures / 74.45.+c – Proximity effects; Andreev reflection; SN and SNS junctions
© EPLA, 2013
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