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Gordon Godfrey Theoretical Seminar 2005 Spin interferometry and entanglement generation with Rashba spin splitting Dr.
Ulrich Zuelicke Date Abstract
The wave nature of electrons in semiconductor nanostructures results in spatial interference effects similar to those exhibited by coherent light. The presence of spin-orbit coupling renders interference in spin space and in real space interdependent, making it possible to manipulate the electron's spin state by addressing its orbital degree of freedom. This suggests the utility of electronic analogs of optical interferometers as blueprints for new spintronics devices. We have investigated this concept theoretically in electronic versions of the Mach-Zehnder interferometer, where spin-dependent interference occurs due to the presence of electric-field tuneable Rashba spin splitting. Such a device can act as a spin-controlled field-effect transistor without magnetic contacts and may be used as a quantum logical gate. In addition, our study of two-electron interference in the spin-dependent Mach-Zehnder interferometer reveals that performing a suitable charge measurement at the output enables nondeterministic entanglement production. Adjustment of the spin-precession length turns out to switch the entangler on and off, as well as control the detailed form of entangled output states. Further InformationContact
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