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Analyzing recent experimental results, we find similar behaviors and a deepanalogy between three-junction superconducting qubits and suspended carbonnanotubes. When these different systems are ac-driven near their resonances,the resonance single-peak, observed at weak driving, splits into two sub-peaks(Fig. 1) when the driving increases. This unusual behavior can be explained byconsidering quantum tunneling in a double well potential for both systems.Inspired by these experiments, we propose a mechanical qubit based on bucklingnanobars--a NEMS so small as to be quantum coherent.  To establish buckling nanobars as legitimate candidates for qubits, wecalculate the effective buckling potential that produces the two-level systemand identify the tunnel coupling between the two local states. We proposedifferent designs of nanomechanical qubits and describe how they can bemanipulated. Also, we outline possible decoherence channels and detectionschemes. A comparison between nanobars and well studied superconducting qubitssuggests several future experiments on quantum electromechanics.Comment: 6 pages, 3 figures, 1 tabl

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