Quantum Computers and Quantum Coherence

Details Quantum Computers and Quantum Coherence Quantum Computers and Quantum Coherence

1999-01-14

arxiv.org/abs/cond-mat/9901137v2

J. of Magnetism and Magnetic Matls. 200, 202 (1999)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, latex, one eps figure. Prepared for special issue of J. Mag. Magn. Matl., "Magnetism beyond 2000". Version 2: small

Scientific paper

10.1016/S0304-8853(99)00315-7

If the states of spins in solids can be created, manipulated, and measured at the single-quantum level, an entirely new form of information processing, quantum computing, will be possible. We first give an overview of quantum information processing, showing that the famous Shor speedup of integer factoring is just one of a host of important applications for qubits, including cryptography, counterfeit protection, channel capacity enhancement, distributed computing, and others. We review our proposed spin-quantum dot architecture for a quantum computer, and we indicate a variety of first generation materials, optical, and electrical measurements which should be considered. We analyze the efficiency of a two-dot device as a transmitter of quantum information via the ballistic propagation of carriers in a Fermi sea.

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