Control of dephasing in spin qubits during coherent transport in silicon

Meng Ke Feng, Jun Yoneda, Wister Huang, Yue Su, Tuomo Tanttu, Chih Hwan Yang, Jesus D. Cifuentes, Kok Wai Chan, William Gilbert, Ross C.C. Leon, Fay E. Hudson, Kohei M. Itoh, Arne Laucht, Andrew S. Dzurak, Andre Saraiva

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

One of the key pathways toward scalability of spin-based quantum computing systems lies in achieving long-range interactions between electrons and increasing their interconnectivity. Coherent spin transport is one of the most promising strategies to achieve this architectural advantage. Experimental results have previously demonstrated high-fidelity transportation of spin qubits between two quantum dots in silicon and identified possible sources of error. In this theoretical study, we investigate these errors and analyze the impact of tunnel coupling, magnetic field, and spin-orbit effects on the spin transfer process. The interplay between these effects gives rise to double dot configurations that include regimes of enhanced decoherence that should be avoided for quantum information processing. These conclusions permit us to extrapolate previous experimental conclusions and rationalize the future design of large-scale quantum processors.

Original languageEnglish
Article number085427
JournalPhysical Review B
Volume107
Issue number8
DOIs
Publication statusPublished - 2023 Feb 15

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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