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Experimental Time-Optimal Universal Control of Spin Qubits in Solids

Author(s)
Geng, Jianpei; Wu, Yang; Wang, Xiaoting; Xu, Kebiao; Shi, Fazhan; Xie, Yijin; Rong, Xing; Du, Jiangfeng; ... Show more Show less
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Abstract
Quantum control of systems plays an important role in modern science and technology. The ultimate goal of quantum control is to achieve high-fidelity universal control in a time-optimal way. Although high-fidelity universal control has been reported in various quantum systems, experimental implementation of time-optimal universal control remains elusive. Here, we report the experimental realization of time-optimal universal control of spin qubits in diamond. By generalizing a recent method for solving quantum brachistochrone equations [X. Wang et al., Phys. Rev. Lett. 114, 170501 (2015)], we obtained accurate minimum-time protocols for multiple qubits with fixed qubit interactions and a constrained control field. Single- and two-qubit time-optimal gates are experimentally implemented with fidelities of 99% obtained via quantum process tomography. Our work provides a time-optimal route to achieve accurate quantum control and unlocks new capabilities for the emerging field of time-optimal control in general quantum systems.
Date issued
2016-10
URI
http://hdl.handle.net/1721.1/107886
Department
Massachusetts Institute of Technology. Research Laboratory of Electronics
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Geng, Jianpei et al. “Experimental Time-Optimal Universal Control of Spin Qubits in Solids.” Physical Review Letters 117.17 (2016): n. pag. © 2016 American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114

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