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Radio frequency measurements of tunnel couplings and singlet–triplet spin states in Si:P quantum dots

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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 Simmons
Spin 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.

History

Publication status

  • Published

File Version

  • Published version

Journal

Nature Communications

ISSN

2041-1723

Publisher

Nature Publishing Group

Volume

6

Page range

8848

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2018-01-15

First Open Access (FOA) Date

2018-01-15

First Compliant Deposit (FCD) Date

2018-01-15

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