Experimental Time-Optimal Universal Control of Spin Qubits in Solids
Open accessAbstract
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.
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The Hilbert-Schmidt norm is widely used in experimental context, not only for quantum optimal control tasks, in order to impose finite energy bandwidth constraints on the control Hamiltonian.
“The Hilbert-Schmidt norm is also widely used in experimental context, not only for quantum optimal control tasks, in order to impose finite energy bandwidth constraints on the control Hamiltonian [70,71].”
From Tight, robust, and feasible quantum speed limits for open dynamics (2019) · cites this paper as [71]
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Tight, robust, and feasible quantum speed limits for open dynamics
Campaioli, F., Pollock, F. A., & Modi, K. (2019) · Quantum · doi:10.22331/q-2019-08-05-168 · Cited by 92 · see citing works
“The Hilbert-Schmidt norm is also widely used in experimental context, not only for quantum optimal control tasks, in order to impose finite energy bandwidth constraints on the control Hamiltonian [70, 71].”
Method
- Authors
- Geng, J., Wu, Y., Wang, X., Xu, K., Shi, F., Xie, Y., Rong, X., & Du, J.
- Affiliations
- University of Science and Technology of China (CN)
- Louisiana State University (US)
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2016-10-19
- Volume
- 117
- Issue
- 17
- Pages
- 170501-170501
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W2532962650
- Cited by
- 68
- References
- 45
- Citations by year
- 2026: 4 · 2025: 6 · 2024: 6 · 2023: 7 · 2022: 13 · 2021: 9 · 2020: 5 · 2019: 8 · 2018: 7 · 2017: 3
- FWCI
- 2.67
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Licence
- Locations
- Physical Review Letters (publishedVersion)
- PubMed (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion)
- arXiv (Cornell University)
- Funders
- National Natural Science Foundation of China (11227901, 31470835, 11275183)
- Chinese Academy of Sciences (XDB01030400)
- National Science Foundation (CCF-1350397)
- National Basic Research Program of China (2013CB921800, 2016YFB0501603)
- Topics
- Physical Sciences › Materials Science › Materials Chemistry › Diamond and Carbon-based Materials Research
- Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
- Physical Sciences › Computer Science › Artificial Intelligence › Quantum Computing Algorithms and Architecture
- Keywords
- time-optimal control, spin qubits, diamond, quantum brachistochrone, multiple qubits, two-qubit gates, single-qubit gates, quantum process tomography, gate fidelity
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