Electron Entanglement via a Quantum Dot

Details Electron Entanglement via a Quantum Dot Electron Entanglement via a Quantum Dot

2001-07-16

arxiv.org/abs/quant-ph/0107084v1

PHYS REV LETT 88 (3): Art. No. 037901 JAN 21 2002

Physics

Quantum Physics

4 pages

Scientific paper

10.1103/PhysRevLett.88.037901

This Letter presents a method of electron entanglement generation. The system under consideration is a single-level quantum dot with one input and two output leads. The leads are arranged such that the dot is empty, single electron tunneling is suppressed by energy conservation, and two-electron virtual co-tunneling is allowed. This yields a pure, non-local spin-singlet state at the output leads. Coulomb interaction is the nonlinearity essential for entanglement generation, and, in its absence, the singlet state vanishes. This type of electron entanglement is a four-wave mixing process analogous to the photon entanglement generated by a Chi-3 parametric amplifier.

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