Physics – Quantum Physics
Scientific paper
2002-08-06
physica status solidi (b) 233, 3, p. 427 - 435, 26 SEP 2002
Physics
Quantum Physics
11 pages, 7 figures, LaTeX code, presented at the 275th Heraeus Seminar on Hardware Concepts for Quantum Computing, to be publ
Scientific paper
10.1002/1521-3951(200210)233:3<4
It is shown that coherent spin motion of electron-hole pairs localized in band gap states of silicon can influence charge carrier recombination. Based on this effect, a readout concept for silicon based solid-state spin--quantum computers as proposed by Kane is suggested. The 31P quantum bit (qbit) is connected via hyperfine coupling to the spin of the localized donor electron. When a second localized and singly occupied electronic state with an energy level deep within the band gap or close to the valence edge is in proximity, a gate controlled exchange between the 31P nucleus and the two electronic states can be activated that leaves the donor-deep level pair either unchanged in a |T->-state or shifts it into a singlet state |S>. Since the donor deep level transition is spin-dependent, the deep level becomes charged or not, depending on the nuclear spin orientation of the donor nucleus. Thus, the state of the qbit can be read with a sequence of light pulses and photo conductivity measurements.
Boehme Christoph
Lips Klaus
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