Mechanically induced two-qubit gates and maximally entangled states for single electron spins in a carbon nanotube

Abstract

We theoretically analyze a system where two electrons are trapped separately in two quantum dots on a suspended carbon nanotube (CNT), subject to external ac electric driving. An indirect mechanically-induced coupling of two distant single electron spins is induced by the interaction between the spins and the mechanical motion of the CNT. We show that a two-qubit iSWAP gate and arbitrary single-qubit gates can be obtained from the intrinsic spin-orbit coupling. Combining the iSWAP gate and single-qubit gates, maximally entangled states of two spins can be generated in a single step by varying the frequency and the strength of the external electric driving field. The spin-phonon coupling can be turned off by electrostatically shifting the electron wave function on the nanotube.

9 pages, 7 figures

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Cited by in corpus (8)

• Coupling a Surface Acoustic Wave to an Electron Spin in diamond via a Dark State
• Strongly-coupled nanotube electromechanical resonators
• High-Fidelity Hot Gates for Generic Spin-Resonator Systems
• Microwave spectroscopy of a carbon nanotube charge qubit
• Quantum entanglement driven by electron-vibrational mode coupling
• Autonomous quantum Maxwell's demon based on two exchange-coupled quantum dots
• Creating arbitrary quantum vibrational states in a carbon nanotube
• Electronic structure of (1e,1h) states of carbon nanotube quantum dots