Abstract
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.
About the speaker
Prof Amnon Aharony received his PhD in high energy physics from Tel Aviv University in 1971. He was postdoc at Cornell University, Harvard University, the University of California at San Diego and Bell Labs from 1972 to 1975, working on critical phenomena. He was Professor of Physics at Tel Aviv University from 1975 to 2006. He joined Ben-Gurion University of the Negev in 2006 and is currently Professor of Physics.
Prof Aharony’s scientific work includes contributions to critical phenomena, disordered systems, percolation, magnetism, mesoscopic physics and spintronics. He has more than 24,000 citations with h-factor 66.
Prof Aharony is a Fellow of the American Physical Society and the Institute of Physics, and a Member of the Norwegian Academy of Science and Letters and the European Academy of Arts, Sciences and Humanities, etc. He received numerous awards including the German Meitner-Humboldt Award and the Norwegian Gunnar Randers' Research Prize.
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