Spintronics and Quantum Dots for Quantum Computing and Quantum Communication

Details Spintronics and Quantum Dots for Quantum Computing and Quantum Communication Spintronics and Quantum Dots for Quantum Computing and Quantum Communication

2000-04-11

arxiv.org/abs/cond-mat/0004182v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Prepared for Fortschritte der Physik special issue, Experimental Proposals for Quantum Computation. 15 pages, 5 figures; typos

Scientific paper

Control over electron-spin states, such as coherent manipulation, filtering and measurement promises access to new technologies in conventional as well as in quantum computation and quantum communication. We review our proposal of using electron spins in quantum confined structures as qubits and discuss the requirements for implementing a quantum computer. We describe several realizations of one- and two-qubit gates and of the read-in and read-out tasks. We discuss recently proposed schemes for using a single quantum dot as spin-filter and spin-memory device. Considering electronic EPR pairs needed for quantum communication we show that their spin entanglement can be detected in mesoscopic transport measurements using metallic as well as superconducting leads attached to the dots.

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