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Two-electron spin correlations in precision placed donors in silicon
journal contribution
posted on 2023-06-09, 13:41 authored by M A Broome, S K Gorman, M G House, Samuel HileSamuel Hile, J G Keizer, D Keith, C D Hill, T F Watson, W J Baker, L C L Hollenberg, M Y SimmonsSubstitutional donor atoms in silicon are promising qubits for quantum computation with extremely long relaxation and dephasing times demonstrated. One of the critical challenges of scaling these systems is determining inter-donor distances to achieve controllable wavefunction overlap while at the same time performing high fidelity spin readout on each qubit. Here we achieve such a device by means of scanning tunnelling microscopy lithography. We measure anti-correlated spin states between two donor-based spin qubits in silicon separated by 16?±?1?nm. By utilising an asymmetric system with two phosphorus donors at one qubit site and one on the other (2P-1P), we demonstrate that the exchange interaction can be turned on and off via electrical control of two in-plane phosphorus doped detuning gates. We determine the tunnel coupling between the 2P-1P system to be 200?MHz and provide a roadmap for the observation of two-electron coherent exchange oscillations.
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Publication status
- Published
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- Published version
Journal
Nature CommunicationsISSN
2041-1723Publisher
Nature Publishing GroupExternal DOI
Issue
980Volume
9Page range
1-7Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2018-06-08First Open Access (FOA) Date
2018-06-08First Compliant Deposit (FCD) Date
2018-06-08Usage metrics
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