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Computing with spins: From classical to quantum computing
release_6en4d46xyngijbpwb6bvxqr524
by
S. Bandyopadhyay
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as a article
.
2004
Abstract
This article traces a brief history of the use of single electron spins to
compute. In classical computing schemes, a binary bit is represented by the
spin polarization of a single electron confined in a quantum dot. If a weak
magnetic field is present, the spin orientation becomes a binary variable which
can encode logic 0 and logic 1. Coherent superposition of these two
polarizations represent a qubit. By engineering the exchange interaction
between closely spaced spins in neighboring quantum dots, it is possible to
implement either classical or quantum logic gates.
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