Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 7: Transport: Quantum Coherence and Quantum Information Systems – Theory (jointly with HL, MA)

TT 7.6: Talk

Monday, March 16, 2015, 10:45–11:00, H 3005

Detecting nonlocal Cooper pair entanglement by optical Bell inequality violation — Simon E. Nigg, Rakesh P. Tiwari, Stefan Walter, and •Thomas L. Schmidt — Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland

Based on the Bardeen Cooper Schrieffer (BCS) theory of superconductivity, the coherent splitting of Cooper pairs from a superconductor to two spatially separated quantum dots has been predicted to generate nonlocal pairs of entangled electrons. In order to test this hypothesis, we propose a scheme to transfer the spin state of a split Cooper pair onto the polarization state of a pair of optical photons. We show that the produced photon pairs can be used to violate a Bell inequality, unambiguously demonstrating the entanglement of the split Cooper pairs.

[1] Nigg et al., arXiv:1411.3945 [cond-mat.mes-hall]