143 research outputs found
Optimal work extraction from quantum states by photo-assisted Cooper pair tunneling
The theory of quantum thermodynamics predicts fundamental bounds on work
extraction from quantum states. As these bounds are derived in a very general
and abstract setting, it is unclear how relevant they are in an experimental
context, where control is typically limited. Here we address this question by
showing that optimal work extraction is possible for a realistic engine. The
latter consists of a superconducting circuit, where a LC-resonator is coupled
to a Josephson junction. The oscillator state fuels the engine, providing
energy absorbed by Cooper pairs, thus producing work in the form of an
electrical current against an external voltage bias. We show that this machine
can extract the maximal amount of work from all Gaussian and Fock states.
Furthermore, we consider work extraction from a continuously stabilized
oscillator state. In both scenarios, coherence between energy eigenstates is
beneficial, increasing the power output of the machine. This is possible
because the phase difference across the Josephson junction provides a phase
reference.Comment: Published versio
DNA origami assembled nanoantennas for manipulating single-molecule spectral emission
Optical nanoantennas can affect the decay rates of nearby emitters by
modifying the local density of photonic states around them. In the
weak-coupling limit, and according to the Fermi's Golden Rule, the emission
spectrum of a dye is given by the energy of all the possible radiative
transitions weighted by the probability of each of them to occur. By
engineering the resonance of a nanoantenna, one can selectively enhance
specific vibronic transitions of a dye molecule, thus shaping its emission
spectrum. Since interactions between emitters and nanoantennas are known to be
position dependent, we make here use of DNA origami to precisely place an
individual dye at different positions around a gold nanorod. We show how this
relative position between the nanorod and the emitter affects the emission
spectrum of the latter. In particular, we observe the appearance of a second
fluorescence peak whose wavelength and intensity are correlated with the
fundamental plasmonic resonance of the nanorod, which we extract from its
photoluminescence spectrum. This second peak results from the selective
enhancement of transitions to different vibrational levels of the excitonic
ground state, whose energies are in resonance with the plasmonic one.
Furthermore, we argue that the drastic alteration of the fluorescence spectrum
in some of our samples cannot be accounted for with Kasha's rule, which
indicates that radiative and vibrational relaxation dye lifetimes can become
comparable through the coupling to the gold nanorods
Challenge of upgrading a core banking system in a Private Bank : how Change Management can support the transition ? [sic]
Comptabilité Contrôle Audi
The REACT study: design of a randomized phase 3 trial to assess the efficacy and safety of clazosentan for preventing deterioration due to delayed cerebral ischemia after aneurysmal subarachnoid hemorrhage.
Evaluation métabolique et physiologique de la profondeur de la sédation en réanimation
AIX-MARSEILLE2-BU MĂ©d/Odontol. (130552103) / SudocPARIS-BIUM (751062103) / SudocSudocFranceF
Monitorage de la profondeur d'anesthésie (comparaison des activités corticale et sous-corticale lors de l'induction d'une anesthésie)
AIX-MARSEILLE2-BU MĂ©d/Odontol. (130552103) / SudocPARIS-BIUM (751062103) / SudocSudocFranceF
Nouvelles thérapeutiques dans l'ischémie cérébrale (potentialisation par l'érythropoïétine de l'effet neuroprotecteur des progéniteurs endothéliaux circulants tardifs sur un modèle d'ischémie cérébrale transitoire et focale chez le rat)
AIX-MARSEILLE2-BU MĂ©d/Odontol. (130552103) / SudocSudocFranceF
Syndrome de Guillain-Barré et myasthénie en réanimation (complications et devenir à long terme)
AIX-MARSEILLE2-BU MĂ©d/Odontol. (130552103) / SudocSudocFranceF
Devenir et facteurs pronostics des accidents vasculaires cérébraux hémorragiques graves en réanimation
AIX-MARSEILLE2-BU MĂ©d/Odontol. (130552103) / SudocSudocFranceF
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