Entanglement witnessing and quantum cryptography with nonideal ferromagnetic detectors

Klobus, Waldemar and Grudka, Andrzej and Baumgartner, Andreas and Tomaszewski, Damian and Schönenberger, Christian and Martinek, Jan. (2014) Entanglement witnessing and quantum cryptography with nonideal ferromagnetic detectors. Physical Review B, 89 (12). p. 125404.

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Official URL: http://edoc.unibas.ch/dok/A6338959

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We investigate theoretically the use of nonideal ferromagnetic contacts as a means to detect quantum entanglement of electron spins in transport experiments. We use a designated entanglement witness and find a minimal spin polarization of eta < 1/root 3 approximate to 58% required to demonstrate spin entanglement. This is significantly less stringent than the ubiquitous tests of Bell`s inequality with eta < 1/(4)root 2 approximate to 84%. In addition, we discuss the impact of decoherence and noise on entanglement detection and apply the presented framework to a simple quantum cryptography protocol. Our results are directly applicable to a large variety of experiments.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Nanoelektronik (Schönenberger)
UniBasel Contributors:Schönenberger, Christian and Baumgartner, Andreas
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:10 May 2017 11:08
Deposited On:06 Feb 2015 09:59

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