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We describe a mechanism for the production of polarization-entangled
microwaves using intraband transitions in a pair of quantum dots. This
proposal relies neither on spin-orbit coupling nor on control over
electron-electron interactions. The quantum correlation of microwave
polarizations is obtained from orbital degrees of freedom in an external
magnetic field. We calculate the concurrence of emitted microwave photon
pairs and show that a maximally entangled Bell pair is, for instance,
obtained in the limit of weak interdot coupling.
Reference: C. Emary, B. Trauzettel, and C.W.J. Beenakker, Phys. Rev. Lett. 95, 127401 (2005). |
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