Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2007

Quantum electromechanics: Quantum tunneling near resonance and qubits from buckling nanoscale bars

Sergey Savel'Ev
  • Fonction : Auteur
A.L. Rakhmanov
  • Fonction : Auteur
Xuedong Hu
  • Fonction : Auteur
Franco Nori
  • Fonction : Auteur

Résumé

Analyzing recent experimental results, 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.

Dates et versions

hal-04896916 , version 1 (20-01-2025)

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Citer

Sergey Savel'Ev, A.L. Rakhmanov, Xuedong Hu, A. Kasumov, Franco Nori. Quantum electromechanics: Quantum tunneling near resonance and qubits from buckling nanoscale bars. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2007, 75 (16), ⟨10.1103/PhysRevB.75.165417⟩. ⟨hal-04896916⟩
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