期刊
NEW JOURNAL OF PHYSICS
卷 23, 期 7, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1367-2630/ac0abf
关键词
exchange interaction; effective mass theory; spin qubits; configuration interaction; donors in silicon
资金
- Australian Research Council Centre of Excellence for Quantum Computation and Communication Technology [CE170100012]
- US Army Research Office [W911NF-17-1-0200]
- Australian Government
- Laboratory Directed Research and Development program [213048]
- National Nuclear Security Administration of the US Department of Energy [DE-NA0003525]
Donor spins in silicon have achieved record values of coherence times and single-qubit gate fidelities, but the next stage of development involves demonstrating high-fidelity two-qubit logic gates. Researchers modeled the two-electron wave function using a full configuration interaction method to aid the efficient design of scalable donor-based quantum processors.
Donor spins in silicon have achieved record values of coherence times and single-qubit gate fidelities. The next stage of development involves demonstrating high-fidelity two-qubit logic gates, where the most natural coupling is the exchange interaction. To aid the efficient design of scalable donor-based quantum processors, we model the two-electron wave function using a full configuration interaction method within a multi-valley effective mass theory. We exploit the high computational efficiency of our code to investigate the exchange interaction, valley population, and electron densities for two phosphorus donors in a wide range of lattice positions, orientations, and as a function of applied electric fields. The outcomes are visualized with interactive images where donor positions can be swept while watching the valley and orbital components evolve accordingly. Our results provide a physically intuitive and quantitatively accurate understanding of the placement and tuning criteria necessary to achieve high-fidelity two-qubit gates with donors in silicon.
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