Berlin 2018 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 84: Fluctuations and Noise

TT 84.5: Vortrag

Donnerstag, 15. März 2018, 10:30–10:45, HFT-FT 131

Continuous-Variable Entanglement Test in a Driven Quantum Contact — •hongxin zhan¹, mihajlo vanević², and wolfgang belzig¹ — ¹Fachbereich Physik, Universität Konstanz, D-78457 Konstanz, Germany — ²Department of Physics, University of Belgrade, 11158 Belgrade, Serbia

The standard entanglement test [1] using Clauser-Horne-Shimony-Holt inequality is known to fail in mesoscopic junctions at finite temperatures [2]. Since this is due to the bidirectional particle flow, a similar failure is expected to occur in an ac-driven contact. We develop a continuous-variable entanglement test suitable for electrons and holes that are created by the ac drive [3]. The generalized Bell inequality [4] is violated in junctions with low conductance or small number of transport channels and with ac voltages which create few electron-hole pairs per cycle. Our ac entanglement test depends on the total number of electron-hole pairs [5] and on the distribution of probabilities of pair creations similar to the Fano factor.

[1] N. M. Chtchelkatchev, G. Blatter, G. B. Lesovik, T. Martin, Phys. Rev. B 66, 161320(2002).

[2] W. R. Hannes, M. Titov, Phys. Rev. B 77, 115323(2008).

[3] H. Zhan, M. Vanević, W. Belzig, arXiv:1711.11461.

[4] A. Bednorz and W. Belzig, Phys. Rev. B 83, 125304(2011).

[5] M. Vanević, Y. V. Nazarov, W. Belzig, Phys. Rev. Lett 99, 076601(2007); Phys. Rev. B 78, 245308(2008).