Journal
NATURE NANOTECHNOLOGY
Volume 8, Issue 9, Pages 654-659Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NNANO.2013.168
Keywords
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Funding
- Intelligence Advanced Research Projects Agency (IARPA) through the Multi-Qubit Coherent Operation (MQCO) programme
- Danish National Research Foundation
- Villum Foundation
- Australian Research Council (ARC) via the Centre of Excellence in Engineered Quantum Systems (EQuS) [CE110001013]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0908070] Funding Source: National Science Foundation
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Quantum-dot spin qubits characteristically use oscillating magnetic or electric fields, or quasi-static Zeeman field gradients, to realize full qubit control. For the case of three confined electrons, exchange interaction between two pairs allows qubit rotation around two axes, hence full control, using only electrostatic gates. Here, we report initialization, full control, and single-shot readout of a three-electron exchange-driven spin qubit. Control via the exchange interaction is fast, yielding a demonstrated 75 qubit rotations in less than 2 ns. Measurement and state tomography are performed using a maximum-likelihood estimator method, allowing decoherence, leakage out of the qubit state space, and measurement fidelity to be quantified. The methods developed here are generally applicable to systems with state leakage, noisy measurements and non-orthogonal control axes.
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