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TT: Tiefe Temperaturen

TT 29: Transport: Quantum Coherence and Quantum Information Systems - Part 1

TT 29.7: Talk

Thursday, March 30, 2006, 11:30–11:45, HSZ 304

Optimal spin-entangled electron-hole pair pump — •Mikhail Titov¹, Carlo Beenakker², and Bjorn Trauzettel² — ¹University of Konstanz, Department of Physics, Germany — ²Instituut Lorentz, Universiteit Leiden, The Netherlands

A nonperturbative theory is presented for the creation by an oscillating potential of spin-entangled electron-hole pairs in the Fermi sea. In the weak potential limit, considered earlier by Samuelsson and Buttiker, the entanglement production is much less than one bit per cycle. We demonstrate that a strong potential oscillation can produce an average of one Bell pair per two cycles, making it an efficient source of entangled flying qubits.