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Spin-entangled currents created by a triple quantum dot.

Daniel S Saraga1, Daniel Loss

  • 1Department of Physics and Astronomy, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland.

Physical Review Letters
|May 7, 2003
PubMed
Summary
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We demonstrate a three-quantum dot system generating spatially separated, entangled electron currents. This setup preserves electron spin entanglement for potential quantum information applications.

Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Nanotechnology

Background:

  • Electron entanglement is crucial for quantum computing.
  • Generating and preserving entangled electrons in a scalable manner remains a challenge.

Purpose of the Study:

  • To propose a novel quantum dot system for generating spatially separated spin-entangled electron currents.
  • To investigate methods for preserving electron entanglement during transport.

Main Methods:

  • Utilizing a three-coupled quantum dot architecture operating in the Coulomb blockade regime.
  • Leveraging the singlet ground state of an even-electron quantum dot to initiate entanglement.
  • Employing secondary quantum dots to facilitate controlled transport and preserve entanglement.

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Main Results:

  • The proposed setup successfully generates spatially separated currents of spin-entangled electrons.
  • Energy mismatch in secondary dots prevents single-electron transport.
  • Resonant enhancement of joint two-electron transport is achieved through energy conservation.

Conclusions:

  • The three-coupled quantum dot system offers a viable source for entangled electron pairs.
  • This method provides a pathway for preserving entanglement during electron extraction.
  • The findings have implications for developing quantum information processing devices.