Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2003-03-21
Phys. Rev. Lett. 91, 076806 (2003).
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Scientific paper
10.1103/PhysRevLett.91.076806
Quantum devices and computers will need operational units in different architectural configurations for their functioning. The unit should be a simple ``quantum toy'', easy to handle superposition states. Here a novel such unit of quantum mechanical flux state (or persistent current) in a conducting ring with three ferromagnetic quantum dots is presented. The state is labeled by the two direction of the persistent current, which is driven by the spin chirality of the dots, and is controled by the spin. It is demosntrated that by use of two rings connected, one can carry out unitary transformations on the input flux state by controling one spin in one of the rings, unabling us to prepare superposition states. The flux is shown to be a quantum XOR operation gate, and may be useful in quantum computing.
Garcia Nancy
Tatara Gen
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