Journal
PHYSICAL REVIEW B
Volume 96, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.96.115305
Keywords
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Funding
- Army Research Office [W911NF-17-1-0274, W911NF-12-1-0607, W911NF-14-1-0080]
- National Science Foundation (NSF) [DMR 0955500, DMR-1206915, PHY-1104660]
- Department of Defense
- Vannevar Bush Faculty Fellowship - Basic Research Office of the Assistant Secretary of Defense for Research and Engineering
- Office of Naval Research [N00014-15-1-0029]
- Department of Energy [DE-FG02-03ER46028]
- NSF-supported shared facilities [DMR-1121288]
- US Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1206915] Funding Source: National Science Foundation
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We study the dynamics of a pulse-gated semiconductor double-quantum-dot qubit. In our experiments, the qubit coherence times are relatively long, but the visibility of the quantum oscillations is low. We show that these observations are consistent with a theory that incorporates decoherence arising from charge noise that gives rise to detuning fluctuations of the double dot. Because effects from charge noise are largest near the singlet-triplet avoided level crossing, the visibility of the oscillations is low when the singlet-triplet avoided level crossing occurs in the vicinity of the charge degeneracy point crossed during the manipulation, but there is only modest dephasing at the large detuning value at which the quantum phase accumulates. This theory agrees well with experimental data and predicts that the visibility can be increased greatly by appropriate tuning of the interdot tunneling rate.
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