Control of dephasing in spin qubits during coherent transport in silicon

Abstract

One of the key pathways towards scalability of spin-based quantum computing systems lies in achieving long-range interactions between electrons and increasing their inter-connectivity. 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.

18 pages, 9 figures

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Cited by in corpus (7)

• Si/SiGe QuBus for single electron information-processing devices with memory and micron-scale connectivity function
• High-fidelity single-spin shuttling in silicon
• Decoherence of electron spin qubit during transfer between two semiconductor quantum dots at low magnetic fields
• Suppressing Si Valley Excitation and Valley-Induced Spin Dephasing for Long-Distance Shuttling
• Interplay of Zeeman Splitting and Tunnel Coupling in Coherent Spin Qubit Shuttling
• Tunable Fano and Dicke effects in quantum transport of double quantum dots sandwiched between topological insulators
• Exploring Entanglement Spectrum and Phase Diagram in multi-electron Quantum Dot Chains