Room-temperature quantum bit storage exceeding 39 minutes using ionized donors in silicon-28.
Science
; 342(6160): 830-3, 2013 Nov 15.
Article
em En
| MEDLINE
| ID: mdl-24233718
ABSTRACT
Quantum memories capable of storing and retrieving coherent information for extended times at room temperature would enable a host of new technologies. Electron and nuclear spin qubits using shallow neutral donors in semiconductors have been studied extensively but are limited to low temperatures (â²10 kelvin); however, the nuclear spins of ionized donors have the potential for high-temperature operation. We used optical methods and dynamical decoupling to realize this potential for an ensemble of phosphorous-31 donors in isotopically purified silicon-28 and observed a room-temperature coherence time of over 39 minutes. We further showed that a coherent spin superposition can be cycled from 4.2 kelvin to room temperature and back, and we report a cryogenic coherence time of 3 hours in the same system.
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MEDLINE
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En
Ano de publicação:
2013
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Article