Srinivasa, V.
, Xu, H.
and Taylor, J.
(2015),
Tunable Spin Qubit Coupling Mediated by a Multi-Electron Quantum Dot, Physical Review Letters, [online], https://doi.org/10.1103/PhysRevLett.114.226803 (Accessed May 9, 2026)
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Tunable Spin Qubit Coupling Mediated by a Multi-Electron Quantum Dot
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Abstract
We present an approach for entangling electron spin qubits localized on spatially separated impurity atoms or quantum dots via a multi-electron, two-level quantum dot. The effective exchange interaction mediated by the dot can be understood as the simplest manifestation of Ruderman- Kittel-Kasuya-Yosida exchange, and can be manipulated through gate voltage control of level splittings and tunneling amplitudes within the system. This provides both a high degree of tuneability and a means for realizing high-fidelity two-qubit gates between spatially separated spins, yielding an experimentally accessible method of coupling donor electron spins in silicon via a hybrid impurity-dot system.Citation
Physical Review Letters
Pub Type
Journals
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Keywords
quantum dots, impurity atoms, exchange interaction, entanglement, two-qubit gate, phosphorus donors, silicon, electrical control, electron spin qubits
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Created June 4, 2015, Updated November 10, 2018