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Two-electron spin correlations in precision placed donors in silicon

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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 Simmons
Substitutional 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.

History

Publication status

  • Published

File Version

  • Published version

Journal

Nature Communications

ISSN

2041-1723

Publisher

Nature Publishing Group

Issue

980

Volume

9

Page range

1-7

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2018-06-08

First Open Access (FOA) Date

2018-06-08

First Compliant Deposit (FCD) Date

2018-06-08

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