Journal
PHYSICAL REVIEW B
Volume 75, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.75.165417
Keywords
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Funding
- EPSRC [EP/D072581/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/D072581/1] Funding Source: researchfish
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Analyzing recent experimental results [Reulet et al., Phys. Rev. Lett. 85, 2829 (2000); Izmalkov et al., Europhys. Lett. 65, 844 (2004)], we find strikingly similar behaviors between two very different systems: three-junction superconducting qubits and suspended carbon nanotubes. When these different systems are ac-driven near their resonances, the resonance single-peak, observed at weak driving amplitudes, splits into two subpeaks for strong driving amplitudes. We describe this unusual behavior by considering quantum tunneling in a double well potential. Inspired by these experiments, we propose a mechanical qubit based on buckling nanoscale bars (nanobars)-a nanoelectromechanical system so small as to be quantum coherent. We consider how this nanomechanical qubit can be manipulated. A comparison between nanobars and superconducting qubits suggests several future experiments on quantum electromechanics.
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