Room-Temperature Quantum Bit Storage Exceeding 39 Minutes Using Ionized Donors in Silicon-28
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 (≲10 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.
- Publication:
-
Science
- Pub Date:
- November 2013
- DOI:
- arXiv:
- arXiv:2303.17734
- Bibcode:
- 2013Sci...342..830S
- Keywords:
-
- PHYSICS Physics, Applied-Physics, Materials-Science;
- Quantum Physics;
- Physics - Applied Physics
- E-Print:
- 5 pages, 4 figures