Abstract
We have developed semiconductor point contact devices in which nuclear spins in a nanoscale region are coherently controlled by all-electrical methods. Different from the standard nuclear-magnetic resonance technique, the longitudinal magnetization of nuclear spins is directly detected by measuring resistance, resulting in ultra-sensitive detection of the microscopic quantity of nuclear spins. All possible coherent oscillations have been successfully demonstrated between two levels from four nuclear spin states of I ≤ 3/2 nuclei. Quantum information processing is discussed based on two fictitious qubits of an I ≤ 3/2 system and methods are described for performing arbitrary logical gates both on one and two qubits. A scheme for quantum state tomography based on Mz-detection is also proposed. As the starting point of quantum manipulations, we have experimentally prepared the effective pure states for the I ≤ 3/2 nuclear spin system.
Original language | English (US) |
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Article number | S13 |
Pages (from-to) | S885-S900 |
Journal | Journal of Physics Condensed Matter |
Volume | 18 |
Issue number | 21 |
DOIs | |
State | Published - May 31 2006 |
All Science Journal Classification (ASJC) codes
- General Materials Science
- Condensed Matter Physics