Journal
PHYSICAL REVIEW B
Volume 84, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.161302
Keywords
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Funding
- Sloan Foundation
- Packard Foundation
- NSF [DMR-0819860, DMR-0846341]
- DARPA QuEST [HR0011-09-1-0007]
- DARPA [N66001-09-1-2020]
- UCSB NSF DMR MRSEC
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [819860] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0846341] Funding Source: National Science Foundation
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We demonstrate multipulse quantum control of a single electron charge qubit. The qubit is manipulated by applying nonadiabatic voltage pulses to a surface depletion gate and readout is achieved using a quantum point-contact charge sensor. We observe Ramsey fringes in the excited-state occupation in response to a pi/2-pi/2 pulse sequence and extract T-2* similar to 60 ps away from the charge degeneracy point. Simulations suggest these results may be extended to implement a charge echo by reducing the interdot tunnel coupling and pulse rise time, thereby increasing the nonadiabaticity of the pulses.
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