Observation of decoherence in a carbon nanotube mechanical resonator

Schneider, Ben; Singh, Vibhor; Venstra, Warner J.; Meerwaldt, Harold B.; Steele, Gary A.

doi:10.1038/ncomms6819

Cited by 43 publications

(59 citation statements)

References 31 publications

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“…be realized in strongly pre-stressed resonators [197][198][199], novel materials such as crystalline diamond [200] or strained crystalline materials [201], or by suppressing clamping losses with suitable architectures [202][203][204]. The realization of large mechanical quality factors allows to address questions including the nonadiabatic dynamics of strongly coupled modes [205], the coherent control of the mechanical state [206,207] as well as a more thorough understanding of nanomechanical coherence [206,208,209].…”

Section: Nanomechanicsmentioning

confidence: 99%

Nanophononics: state of the art and perspectives

et al. 2016

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Abstract. Understanding and controlling vibrations in condensed matter is emerging as an essential necessity both at fundamental level and for the development of a broad variety of technological applications. Intelligent design of the band structure and transport properties of phonons at the nanoscale and of their interactions with electrons and photons impact the efficiency of nanoelectronic systems and thermoelectric materials, permit the exploration of quantum phenomena with micro-and nanoscale resonators, and provide new tools for spectroscopy and imaging. In this colloquium we assess the state of the art of nanophononics, describing the recent achievements and the open challenges in nanoscale heat transport, coherent phonon generation and exploitation, and in nano-and optomechanics. We also underline the links among the diverse communities involved in the study of nanoscale phonons, pointing out the common goals and opportunities.

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Section: Nanomechanicsmentioning

confidence: 99%

Nanophononics: state of the art and perspectives

et al. 2016

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“…Dephasing can occur, for instance, due to thermoelastic fluctations 27 , strong electromechanical coupling 28 or, in the case of mass sensors, due to fluctuating mass loads [29][30][31][32][33] . To distinguish dephasing from dissipation, time domain techniques, such as ring-down measurements, have recently been developed 35,36 . In addition to resonator dephasing from diffusing ad-…”

Section: Introductionmentioning

confidence: 99%

Particle number scaling for diffusion-induced dissipation in graphene and carbon nanotube nanomechanical resonators

Rhén

Isacsson

2016

Phys. Rev. B

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When a contaminant diffuses on the surface of a nanomechanical resonator, the motions of the two become correlated. Despite being a high-order effect in the resonator-particle coupling, such correlations affect the system dynamics by inducing dissipation of the resonator energy. Here, we consider this diffusion-induced dissipation in the cases of multiple particles adsorbed on carbon nanotube and graphene resonators. By solving the stochastic equations of motion, we simulate the ringdown of the resonator, in order to determine the resonator energy decay rate. We find two different scalings with the number of adsorbed particles K and particle mass m. In the regime where the adsorbates are inertially trapped at an antinode of vibration, the dissipation rate Γ scales with the total adsorbed mass Γ ∝ Km. In contrast, in the regime where particles diffuse freely over the resonator, the dissipation rate scales as the product of the total adsorbed mass and the individual particle mass: Γ ∝ Km 2 .

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“…In doubly-clamped SiN nano-beams this nonlinearity is known to be important [34], which means that already modest drive excitations can bring the device into the Duffing regime. This fact naturally brings in two questions: are there as well any nonlinear relaxation/ decoherence processes to discover in SiN structures, like for nanotubes [6,12] ? And how do we perform T 1 and T 2 measurements within a highly nonlinear/bistable dynamic system ?…”

Section: Damping and Dephasing In The Nonlinear Regimementioning

confidence: 99%

“…Building on the new methods presented, we furthermore discuss the possibility to extract information about the fluctuations statistics from the shape of the spectral response in actual devices suffering from dephasing. The experiment is performed at 4.2 K in a cryogenic vacuum (pressure < -10 mbar 6 ). We first perform a careful calibration of the whole setup following [29], giving access to displacements and injected driving force in real units.…”

Section: Introductionmentioning

confidence: 99%

Classical decoherence in a nanomechanical resonator

et al. 2016

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Decoherence is an essential mechanism that defines the boundary between classical and quantum behaviours, while imposing technological bounds for quantum devices. Little is known about quantum coherence of mechanical systems, as opposed to electromagnetic degrees of freedom. But decoherence can also be thought of in a purely classical context, as the loss of phase coherence in the classical phase space. Indeed the bridge between quantum and classical physics is under intense investigation, using, in particular, classical nanomechanical analogues of quantum phenomena. In the present work, by separating pure dephasing from dissipation, we quantitatively model the classical decoherence of a mechanical resonator: through the experimental control of frequency fluctuations, we engineer artificial dephasing. Building on the fruitful analogy introduced between spins/quantum bits and nanomechanical modes, we report on the methods available to define pure dephasing in these systems, while demonstrating the intrinsic almost-ideal properties of silicon nitride beams. These experimental and theoretical results, at the boundary between classical nanomechanics and quantum information fields, are prerequisite in the understanding of decoherence processes in mechanical devices, both classical and quantum. 1 2 then leads to the definition of a pure dephasing rate G f [6].While the reported T 1 and T 2 for a particular qubit are often significantly different [7], such a difference in a nanomechanical resonator is still rare in the literature: usually mechanical systems seem to experience frequency fluctuations small compared to dissipation mechanisms, and do not exhibit visible spectral broadening due to dephasing [8][9][10][11]. Nonetheless, pure dephasing has been observed in [16][17][18]20]. But direct comparisons between time-domain (T 1 ) and frequency-domain (T 2 ) are still rare: thus, the second and main reason for the scarcity of experimental studies on mechanical decoherence is a lack of data combining these techniques. To our OPEN ACCESS RECEIVED

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Observation of decoherence in a carbon nanotube mechanical resonator

Cited by 43 publications

References 31 publications

Nanophononics: state of the art and perspectives

Nanophononics: state of the art and perspectives

Particle number scaling for diffusion-induced dissipation in graphene and carbon nanotube nanomechanical resonators

Classical decoherence in a nanomechanical resonator

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