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Radio frequency measurements of tunnel couplings and singlet–triplet spin states in Si:P quantum dots
journal contribution
posted on 2023-06-09, 08:58 authored by M G House, T Kobayashi, B Weber, Samuel HileSamuel Hile, T F Watson, J van der Heijden, S Rogge, M Y SimmonsSpin states of the electrons and nuclei of phosphorus donors in silicon are strong candidates for quantum information processing applications given their excellent coherence times. Designing a scalable donor-based quantum computer will require both knowledge of the relationship between device geometry and electron tunnel couplings, and a spin readout strategy that uses minimal physical space in the device. Here we use radio frequency reflectometry to measure singlet–triplet states of a few-donor Si:P double quantum dot and demonstrate that the exchange energy can be tuned by at least two orders of magnitude, from 20?µeV to 8?meV. We measure dot–lead tunnel rates by analysis of the reflected signal and show that they change from 100?MHz to 22?GHz as the number of electrons on a quantum dot is increased from 1 to 4. These techniques present an approach for characterizing, operating and engineering scalable qubit devices based on donors in silicon.
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Publication status
- Published
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- Published version
Journal
Nature CommunicationsISSN
2041-1723Publisher
Nature Publishing GroupExternal DOI
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6Page range
8848Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2018-01-15First Open Access (FOA) Date
2018-01-15First Compliant Deposit (FCD) Date
2018-01-15Usage metrics
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