Spin Qubit Relaxation in a Moving Quantum Dot

Abstract

Long-range quantum communication for spin qubits is an important open problem. Here we study decoherence of an electron spin qubit that is being transported in a moving quantum dot. We focus on spin decoherence due to spin-orbit interaction and a random electric potential. We find that at the lowest order, the motion induces longitudinal spin relaxation, with a rate linear in the dot velocity. Our calculated spin relaxation time ranges from sub $\mu$s in GaAs to above ms in Si, making this relaxation a significant decoherence channel. Our results also give clear indications on how to reduce the decoherence effect of electron motion.

7 pages and 3 figures

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• Electron qubits surfing on acoustic waves: review of recent progress
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• Quantum simulation of particle creation in curved space-time
• Universal control of superexchange in linear triple quantum dots with an empty mediator
• Driving spin and charge in quantum wells by surface acoustic waves
• Decoherence and fidelity enhancement during shuttling of entangled spin qubits
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