Entanglement-induced electron coherence in a mesoscopic ring with two magnetic impurities

Abstract

We investigate the Aharonov-Bohm (AB) interference pattern in the electron transmission through a mesoscopic ring in which two identical non-interacting magnetic impurities are embedded. Adopting a quantum waveguide theory, we derive the exact transmission probability amplitudes and study the influence of maximally entangled states of the impurity spins on the electron transmittivity interference pattern. For suitable electron wave vectors, we show that the amplitude of AB oscillations in the absence of impurities is in fact not reduced within a wide range of the electron-impurity coupling constant when the maximally entangled singlet state is prepared. Such state is thus able to inhibit the usual electron decoherence due to scattering by magnetic impurities. We also show how this maximally entangled state of the impurity spins can be generated via electron scattering.

8 pages

References in corpus (7)

• Quantum Computers and Dissipation
• Phase coherent transmission through interacting mesoscopic systems
• Entanglement of Two Impurities through Electron Scattering
• Entanglement Controlled Single-Electron Transmittivity
• Resonant Scattering Can Enhance the Degree of Entanglement
• Aharonov-Bohm oscillations and spin transport in a mesoscopic ring with a magnetic impurity
• Two-spin entanglement induced by electron scattering in nanostructures

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