Professor Amnon Aharony, Tel Aviv University and Ben Gurion University
April 29, 2013, 13:00
Seminar Room 424/8
Quantum computing requires the ability to write and read quantum information on the spinors of electrons. This work considers mobile
electrons, which move through mesoscopic (or molecular) quantum networks (made of quantum wires or of arrays of quantum dots).
Combining spin-orbit interactions, whose strength can be tuned by external gate voltages, and the Aharonov-Bohm flux, which can be tuned by an external magnetic field, one can manipulate the properties of such networks, so that the outgoing electrons are polarized along a desired direction. This amounts to 'writing'
the desired information on the spinor of the electrons. Given a beam of polarized electrons, the charge conductance
of the same network depends on their polarization, allowing 'reading'
the qubit information. Specific results will be presented for a simple closed interferometer. The talk will also report on more recent work: (a) The above filtering is robust against leaking of electrons, in an open interferometer; (b) Filtering can also be achieved for a single one dimensional chain which has spin-orbit interactions, when the chain vibrates in the transverse direction.
Holon Institute of Technology, Faculty of Sciences