Quantum electromechanics: Quantum tunneling near resonance and qubits from buckling nanobars
arXiv:cond-mat/0601019 · doi:10.1103/PhysRevB.75.165417
Abstract
Analyzing recent experimental results, we find similar behaviors and a deep analogy between 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, splits into two sub-peaks (Fig. 1) when the driving increases. This unusual behavior can be explained by considering quantum tunneling in a double well potential for both systems. Inspired by these experiments, we propose a mechanical qubit based on buckling nanobars--a NEMS so small as to be quantum coherent. To establish buckling nanobars as legitimate candidates for qubits, we calculate the effective buckling potential that produces the two-level system and identify the tunnel coupling between the two local states. We propose different designs of nanomechanical qubits and describe how they can be manipulated. Also, we outline possible decoherence channels and detection schemes. A comparison between nanobars and well studied superconducting qubits suggests several future experiments on quantum electromechanics.
arXiv comment6 pages, 3 figures, 1 table
References in corpus (37)
- Coherent control of macroscopic quantum states in a single-Cooper-pair box
- Noiseless Quantum Codes
- Superconducting Circuits and Quantum Information
- Coherent dynamics of a flux qubit coupled to a harmonic oscillator
- Quantum oscillations in two coupled charge qubits
- Cooling a nanomechanical resonator with quantum back-action
- Quiet SDS Josephson Junctions for Quantum Computing
- Entanglement and decoherence of a micromechanical resonator via coupling to a Cooper box
- Laser cooling of a nanomechanical resonator mode to its quantum ground state
- Optical selection rules and phase-dependent adiabatic state control in a superconducting quantum circuit
- Coherent Signal Amplification in Bistable Nanomechanical Oscillators by Stochastic Resonance
- Voltage rectification by a SQUID ratchet
- Noise-enabled precision measurements of a Duffing nanomechanical resonator
- Scalable quantum computing with Josephson charge qubits
- Towards mechanical entanglement in nano-electromechanical devices
- Coupled ion - nanomechanical systems
- Ground state cooling of mechanical resonators
- Feedback cooling of a nanomechanical resonator
- Bolometric detection of mechanical bending waves in suspended carbon nanotubes
- Enhanced Macroscopic Quantum Tunneling in BiSrCaCuO Intrinsic Josephson Junction Stacks
- Squeezed Phonon States: Modulating Quantum Fluctuations of Atomic Displacements
- Probing tiny motions of nanomechanical resonators: classical or quantum mechanical?
- Evidence for Quantized Displacement in Macroscopic Nanomechanical Oscillators
- Phonon Squeezed States Generated by Second Order Raman Scattering
- Operation of universal gates in a DXD superconducting solid state quantum computer
- Quantum Phonon Optics: Coherent and Squeezed Atomic Displacements
- Quantum Effects in the Mechanical Properties of Suspended Nanomechanical Systems
- Phonon Squeezed States: Quantum Noise Reduction in Solids
- Nanomechanical Analog of a Laser: Amplification of Mechanical Oscillations by Stimulated Zeeman Transitions
- Observation of macroscopic Landau-Zener transitions in a superconducting device
- Macroscopic quantum effects in a strongly driven nanomechanical resonator
- Correlation-induced suppression of decoherence in capacitively coupled Cooper-pair boxes
- Nonlinear response of a driven vibrating nanobeam in the quantum regime
- Radio-Frequency Method for Investigation of Quantum Properties of Superconducting Structures
- Dynamics of the quantum Duffing oscillator in the driving induced bistable regime
- Macroscopic quantum effects in nanomechanical systems
- Temperature dependence of a nanomechanical switch
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- Chirality tunneling and quantum dynamics for domain walls in mesoscopic ferromagnets
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- Macroscopic quantum tunneling in nanoelectromechanical systems
- Shock Waves in Nanomechanical Resonators
- Enhancing the conductance of a two-electron nanomechanical oscillator
- Hysteretic jumps in the response of layered superconductors to electromagnetic fields
- Macroscopic quantum tunneling and phase diffusion in a LaSrCuO intrinsic Josephson junction stack
- Coherent emission from disordered arrays of driven Josephson vortices
- Cotunneling, current blockade, and backaction forces in nanobeams close to the Euler buckling instability
- Magnetoelastic Coupling and Possibility of Spintronic Electromagnetomechanical Effects
- Stability and chaos of a driven nano-electromechanical Josephson junction
- Quantum buckling in metal-organic framework materials