Stefano Zippilli

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We present a quantum theory of cooling of a mechanical resonator using back action with a constant electron current. The resonator device is based on a doubly clamped nanotube, which mechanically vibrates and acts as a double quantum dot for electron transport. Mechanical vibrations and electrons are coupled electrostatically using an external gate. The(More)
We derive an equation for the cooling dynamics of the quantum motion of an atom trapped by an external potential inside an optical resonator. This equation has broad validity and allows us to identify novel regimes where the motion can be efficiently cooled to the potential ground state. Our result shows that the motion is critically affected by quantum(More)
We study the mechanical effects of light on an atom trapped in a harmonic potential when an atomic dipole transition is driven by a laser and it is strongly coupled to a mode of an optical resonator. We investigate the cooling dynamics in the bad cavity limit, focussing on the case in which the effective transition linewidth is smaller than the trap(More)
We investigate theoretically the mechanical effects of light on atoms trapped by an external potential, whose dipole transition couples to the mode of an optical resonator and is driven by a laser. We derive an analytical expression for the quantum center-of-mass dynamics, which is valid in presence of a tight external potential. This equation has broad(More)
When N driven atoms emit in phase into a high-Q cavity mode, the intracavity field generated by collective scattering interferes destructively with the pump driving the atoms. Hence atomic fluorescence is suppressed and cavity loss becomes the dominant decay channel for the whole ensemble. Microscopically, 3D light-intensity minima are formed in the(More)
Stefano Zippilli,1,2,3 Adrian Bachtold,4 and Giovanna Morigi1,2 1Departament de Física, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain 2Theoretische Physik, Universität des Saarlandes, 66041 Saarbrücken, Germany 3Fachbereich Physik, Universität Kaiserslautern, 67663 Kaiserslautern, Germany 4CIN2 (CSIC-ICN), Campus de la UAB, E-08193(More)
Marc Bienert, J. Mauricio Torres, Stefano Zippilli, and Giovanna Morigi Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, 62251 Cuernavaca, Morelos, Mexico Grup d’Optica, Departament de Fisica, Universitat Autónoma de Barcelona, 08193 Bellaterra, Spain ICFO—Institut de Ciències Fotòniques, 08860 Castelldefels (Barcelona), Spain(More)
We study the quantum dynamics of an array of coherently driven two-level atoms coupled to an optical resonator. In the strong coupling regime the cavity field generated by atomic scattering interferes destructively with the pump on the atoms. In this configuration atomic excitation is suppressed even for strong driving fields, while the stationary(More)