Measurement and Manipulation of Nuclear Spins Embedded in Low Dimensional Quantum Hall Electronic Semiconductor Systems: A Novel Experimental Approach to Quantum Computation
Final progress rept. 1 Jun 2001-28 Feb 2005
HARVARD UNIV CAMBRIDGE MA DIV OF ENGINEERING AND APPLIED SCIENCES
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This research explores the possibility of building a semiconductor-based quantum Hall quantum computer. The aim of this study is to develop the technology to initialize measure and manipulate the spin polarization of nuclei in semiconductor nanostructures which could constitute the quantum bits qubits and obtain electrically controlled electron mediated spin interaction between nuclear spin domains. The physical mechanism to be utilized here for the handling of nuclear spins is the hyperfine interaction which will be used to pump- and detect- nuclear polarization via Electrically Detected Electron Spin Resonance EDESR under microwave excitation. A hyperfine interaction EDESR based scheme has the advantage that only nuclei in the immediate vicinity of the relevant confined electrons can via the flip-flop interaction obtain spin polarization from electrons. Thus one can obtain spatial selectivity in the polarization and measurement of spin. Indeed in gated devices where even the presence of electrons can be switched electrically one can then electrically select the ensemble of nuclei that are to obtain polarization and control their number through the choice of gate size. The study will aim to refine and improve the sensitivity of EDESR and EDNMR Electrically Detected Nuclear Magnetic Resonance techniques and apply them to progressively smaller structures. The project will also investigate both experimentally and theoretically the nature of electron mediated spin transfer between nuclei and the coherence and relaxation times of spins in nanostructures.
- Nuclear Physics and Elementary Particle Physics
- Quantum Theory and Relativity