Projects per year
Abstract
Charge noise is the main hurdle preventing high-fidelity operation, in particular that of two-qubit gates, of semiconductor-quantum-dot-based spin qubits. While certain sweet spots where charge noise is substantially suppressed have been demonstrated in several types of spin qubits, the existence of one for coupled singlet-triplet qubits is unclear. We theoretically demonstrate, using full configuration-interaction calculations, that a range of nearly sweet spots appears in the coupled singlet-triplet qubit system when a strong enough magnetic field is applied externally. We further demonstrate that ramping to and from the judiciously chosen nearly sweet spot using sequences based on the shortcut to adiabaticity offers maximal gate fidelities under charge noise and phonon-induced decoherence. These results should facilitate realization of high-fidelity two-qubit gates in singlet-triplet qubit systems.
Original language | English |
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Article number | L161409 |
Journal | Physical Review B |
Volume | 103 |
Issue number | 16 |
DOIs | |
Publication status | Published - 15 Apr 2021 |
Publisher's Copyright Statement
- COPYRIGHT TERMS OF DEPOSITED FINAL PUBLISHED VERSION FILE: Chan, G. X., Kestner, J. P., & Wang, X. (2021). Charge noise suppression in capacitively coupled singlet-triplet spin qubits under magnetic field. Physical Review B, 103(16), [L161409]. https://doi.org/10.1103/PhysRevB.103.L161409. The copyright of this article is owned by American Physical Society.
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- 3 Finished
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GRF: Quantum Control through Reinforcement Learning
WANG, X. S. (Principal Investigator / Project Coordinator)
1/01/21 → 12/06/25
Project: Research
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GRF: Robust Control of Quantum-dot Spin Qubits from Machine Learning
WANG, X. S. (Principal Investigator / Project Coordinator)
1/01/19 → 8/02/23
Project: Research
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GRF: Theory on Robust Manipulation of Silicon-based Spin Qubits
WANG, X. S. (Principal Investigator / Project Coordinator)
1/01/18 → 19/08/21
Project: Research