A5059676806- Quantum Information and Cryptography
- Quantum optics and atomic interactions
- Mechanical and Optical Resonators
- Quantum Mechanics and Applications
- Photonic and Optical Devices
- Cold Atom Physics and Bose-Einstein Condensates
- Force Microscopy Techniques and Applications
- Nonlinear Dynamics and Pattern Formation
- Micro and Nano Robotics
- Advanced MEMS and NEMS Technologies
- Advanced Fluorescence Microscopy Techniques
- Quantum chaos and dynamical systems
- Renal and related cancers
- Semiconductor Quantum Structures and Devices
- Acoustic Wave Resonator Technologies
- Near-Field Optical Microscopy
- Digital Holography and Microscopy
- Advanced Thermodynamics and Statistical Mechanics
- Engineering Technology and Methodologies
- Geophysics and Sensor Technology
- Particle Dynamics in Fluid Flows
- stochastic dynamics and bifurcation
- Advanced Fiber Laser Technologies
- Molecular Junctions and Nanostructures
- Microtubule and mitosis dynamics
École Polytechnique Fédérale de Lausanne
2013-2020
Institute of Photonic Sciences
2006-2015
Hospital Universitario de Gran Canaria Doctor Negrín
2012
We show how to use the radiation pressure optomechanical coupling between a mechanical oscillator and an optical cavity field generate in heralded way single quantum of motion (a Fock state). Starting with close its ground state, laser pumping upper motional sideband produces correlated photon-phonon pairs via parametric down-conversion. Subsequent detection scattered Stokes photon projects macroscopic into single-phonon state. The nonclassical nature this state can be demonstrated by...
We present quantum yield measurements of single layer WSe2 (1L-WSe2) integrated with high-Q ( Q > 106) optical microdisk cavities, using an efficient (η 90%) near-field coupling scheme based on a tapered fiber. Coupling the excitonic emission is achieved by placing 1L-WSe2 in evanescent cavity field. This preserves microresonator high intrinsic quality factor below bandgap 1L-WSe2. The QYc ≈ 10-3, consistent operation broad emitter regime (i.e., lifetime significantly shorter than bare decay...
We present a tunable, frequency-stabilized, narrow-bandwidth source of frequency-degenerate, entangled photon pairs. The is based on spontaneous parametric downconversion in periodically poled KTiOPO(4). Its wavelength can be stabilized to 850 or 854 nm, thus allowing address two transitions (40)Ca(+) ions. output bandwidth 22 MHz coincides with the absorption calcium spectral power density 1.0 generated pairs/(s mW).
We address with fluid-dynamical simulations using direct numerical techniques three important and fundamental questions respect to fluid flow within the mouse node left–right development. First, we consider differences between what is experimentally observed when assessing cilium-induced in vitro be expected vivo . The distinction that , leftward across takes place a closed system consequently confined, while this no longer case on removing covering membrane immersing embryo fluid-filled...
In this work we present a simple method to reconstruct the complex spectral wavefunction of biphoton, and hence gain complete information about temporal properties photon pair. The technique, which relies on quantum interference, is applicable biphoton states produced with monochromatic pump when shift frequency produces in relative frequencies contributing biphoton. We demonstrate an example such situation type-II parametric down-conversion (SPDC) allowing arbitrary paraxial spatial...
We report a tunable single-photon source based on single trapped ion. Employing spontaneous Raman scattering and in-vacuum optics with large numerical aperture, photons are efficiently created controlled temporal shape coherence time. These can be varied between 70 ns $1.6\text{ }\text{ }\ensuremath{\mu}\mathrm{s}$, as characterized by operating two sources simultaneously in remote ion traps which reveals mutual individual through two-photon interference.
We observe the interaction of a single trapped calcium ion with photons produced by narrow-band, resonant down-conversion source [A. Haase et al., Opt. Lett. 34, 55 (2009)], employing quantum jump scheme. Using temperature dependence spectrum and tunability narrow source, absorption is quantitatively characterized.
We use a single trapped 40Ca+ ion as resonant, polarization-sensitive absorber to detect and characterize the entanglement of tunable narrowband photon pairs from spontaneous parametric down-conversion source. Single-photon absorption is marked by quantum jump in heralded coincident detection partner photon. For three polarization basis settings herald, we find maximum coincidences always for orthogonal polarizations. The further evidenced tomographic reconstruction biphoton state with an...
The radiation-pressure interaction between one or more laser fields and a mechanical oscillator gives rise to wide range of phenomena: from sideband cooling backaction-evading measurements pondermotive squeezing entanglement motional asymmetry. In many protocols, such as dissipative squeezing, multiple lasers are utilized, giving periodically driven optomechanical systems. Here we show that in this case, Floquet dynamics can arise due presence Kerr-type nonlinearities, which ubiqitious...
We present the development and operation of a tunable, frequency-stabilized, narrow-bandwidth source entangled photon pairs, which can be tuned to two D–P transitions in Ca+ ions at 850 854 nm. The is based on spontaneous parametric down-conversion periodically poled KTiOPO4 (PPKTP) followed by tunable optical filters. Its output bandwidth 22 MHz coincides with absorption calcium ions. spectral power density 1.0 generated pairs (s mW)−1. Here, we report details setup was first described...
Mixing fluid in a container at low Reynolds number - an inertialess environment is not trivial task. Reciprocating motions merely lead to cycles of mixing and unmixing, so continuous rotation, as used many technological applications, would appear be necessary. However, there another solution: movement the walls cyclical fashion introduce geometric phase. We show using journal-bearing flow model that such general tool for deformable boundaries return same position mix number. then simulate...
Mixing fluids often involves a periodic action, like stirring one’s tea. But reciprocating motions in at low Reynolds number, Stokes flows where inertia is negligible, lead to cycles of mixing and unmixing, because the physics, molecular diffusion excepted, time reversible. So how can fluid be mixed such circumstances? The answer geometric phase. Geometric phases are found everywhere physics as anholonomies, after closed circuit parameters, some system variables do not return their original...
We study the propagation of fronts in extended oscillatory reaction-diffusion systems that contain several coexisting limit cycles. In contrast with variational behavior, between regions oscillating two different cycles are found to propagate not necessarily towards region less stable cycle, but largest amplitudes, provided frequency mismatch is sufficiently large. other words, smaller oscillations can always be made control whole system.
In the fluorescence light of a single atom, probability for emission photon with certain polarization depends on emitted immediately before it. Here correlations such kind are investigated trapped calcium ion by means second order correlation functions. A theoretical model is developed and fitted to experimental data, which show 91% polarization-correlated pairs within 24 ns.