TAILIEUCHUNG - Xu et al. Nanoscale Research Letters 2011, 6:355

Xu et al. Nanoscale Research Letters 2011, 6:355 NANO EXPRESS Open Access Quantum-squeezing effects of strained multilayer graphene NEMS Yang Xu1*, Sheping Yan1, Zhonghe Jin1* and Yuelin Wang2 Abstract Quantum squeezing can improve the ultimate measurement precision by squeezing one desired fluctuation of the two physical quantities in Heisenberg relation. We propose a scheme to obtain squeezed states through graphene nanoelectromechanical system (NEMS) taking advantage of their thin thickness in principle. Two key criteria of achieving squeezing states, zero-point displacement uncertainty and squeezing factor of strained multilayer graphene NEMS, are studied. Our research promotes the measured precision limit of graphene-based nanotransducers by reducing quantum. | Xu et al. Nanoscale Research Letters 2011 6 355 http content 6 1 355 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Quantum-squeezing effects of strained multilayer graphene NEMS Yang Xu1 Sheping Yan1 Zhonghe Jin1 and Yuelin Wang2 Abstract Quantum squeezing can improve the ultimate measurement precision by squeezing one desired fluctuation of the two physical quantities in Heisenberg relation. We propose a scheme to obtain squeezed states through graphene nanoelectromechanical system NEMS taking advantage of their thin thickness in principle. Two key criteria of achieving squeezing states zero-point displacement uncertainty and squeezing factor of strained multilayer graphene NEMS are studied. Our research promotes the measured precision limit of graphene-based nanotransducers by reducing quantum noises through squeezed states. Introduction The Heisenberg uncertainty principle or the standard quantum limit 1 2 imposes an intrinsic limitation on the ultimate sensitivity of quantum measurement systems such as atomic forces 3 infinitesimal displacement 4 and gravitational-wave 5 detections. When detecting very weak physical quantities the mechanical motion of a nano-resonator or nanoelectromechanical system NEMS is comparable to the intrinsic fluctuations of the systems including thermal and quantum fluctuations. Thermal fluctuation can be reduced by decreasing the temperature to a few mK while quantum fluctuation the quantum limit determined by Heisenberg relation is not directly dependent on the temperature. Quantum squeezing is an efficient way to decrease the system quantum 6-8 . Thermomechanical noise squeezing has been studied by Rugar and Grutter 9 where the resonator motion in the fundamental mode was parametrically squeezed in one quadrature by periodically modulating the effective spring constant at twice its resonance frequency. Subsequently Suh et al. 10 have successfully achieved parametric .

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