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Spin-entangled electrons in mesoscopic systems

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2001

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Sukhorukov, Eugene V.
Recher, Patrik
Loss, Daniel

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Physics Uspekhi. 2001, 44(10), pp. 126-131. ISSN 0038-5670. eISSN 1468-4780. Available under: doi: 10.1070/1063-7869/44/10S/S28

Zusammenfassung

Entanglement acts as a fundamental resource for many applications in quantum communication. We propose and theoretically analyze methods for preparing and detecting entanglement between the spins of electrons in a mesoscopic environment. The entanglement production mechanism which we present is based on two quantum dots coupled to a superconductor from which paired electrons are injected via Andreev tunneling. The spin-correlated electrons can then hop from the quantum dots into normal leads. For detection we propose to measure the shot noise which is produced by the entangled electrons after they have passed a beam splitter. The enhancement of the noise by a factor of two turns out to be a unique signature for the spin singlet, a maximally entangled state. In a different setting, the entangled ground state in two tunnel-coupled quantum dots is detected via the Aharonov–Bohm oscillations in the co-tunneling current.

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Fachgebiet (DDC)
530 Physik

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Superconductivity, Condensed matter: electrical, magnetic and optical, Surfaces, interfaces and thin films, Nanoscale science and low-D systems

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ISO 690BURKARD, Guido, Eugene V. SUKHORUKOV, Patrik RECHER, Daniel LOSS, 2001. Spin-entangled electrons in mesoscopic systems. In: Physics Uspekhi. 2001, 44(10), pp. 126-131. ISSN 0038-5670. eISSN 1468-4780. Available under: doi: 10.1070/1063-7869/44/10S/S28
BibTex
@article{Burkard2001Spine-29155,
  year={2001},
  doi={10.1070/1063-7869/44/10S/S28},
  title={Spin-entangled electrons in mesoscopic systems},
  number={10},
  volume={44},
  issn={0038-5670},
  journal={Physics Uspekhi},
  pages={126--131},
  author={Burkard, Guido and Sukhorukov, Eugene V. and Recher, Patrik and Loss, Daniel}
}
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