Dr
Marco Pizzocaro
(INRIM)
22/02/2016 16:00
Poster
BIPM has recognized the 1S0-3P0 forbidden transition in neutral Ytterbium as a secondary representation of the second.
At INRIM, an optical lattice clock based on neutral 171Yb is under operation and currently the metrological characterization of the standard is ongoing.
The dipole trap at the magic wavelength of 759 nm collects up to 10^4 atoms in about 200 ms, starting from a double stage...
M.
Tommaso Mazzoni
(Università di Firenze)
22/02/2016 16:00
Poster
We report on the first atom interferometer based on large-momentum-transfer Bragg diffraction with strontium atoms in a fountain. We measured gravity acceleration of $^{88}\mathrm{Sr}$ isotope with a sensitivity $\delta g/g=4\times 10^{-8}$ at $2000$ s integration time [1]. This isotope has powerful coherence properties such as zero total spin in the ground state, narrow optical transitions,...
Mlle
Sarah Bromley
(JILA)
22/02/2016 16:00
Poster
We investigate collective emission from coherently driven ultracold ${^{88}}$Sr atoms. We perform two sets of experiments, using a strong and weak transition that are insensitive and sensitive, respectively, to atomic motion at one microKelvin. We observe highly directional forward emission with a peak intensity that is enhanced, for the strong transition, by ${10^{3}}$ compared to that in the...
M.
Slawomir Bilicki
(LNE-SYRTE, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, 61 avenue de l’Observatoire, 75014 Paris, France)
22/02/2016 16:00
Poster
Sr Opical Lattice Clocks (OLCs) are promising candidates for a compact, transportable and even potentially space optical lattice clock. The space or transport applications need a compact and reliable apparatus. One of the largest problem is a miniaturization of lattice source at 813 nm. Due to the fact that the lattice light is countinously on during a clock cycle, in major cases...
Dr
Maykel L. González Martínez
(Laboratoire Aimé Cotton (CNRS))
22/02/2016 16:00
Poster
Many groups have now succeeded in producing alkali-metal dimers in high-lying vibrational states by either magneto- or photoassociation, and a few of these species have already been transferred to their absolute ground states. The alkali-metal dimers all have singlet ground states and there is considerable interest in extending molecule formation to molecules with doublet ground states, such...
Dr
Maykel L. González Martínez
(Laboratoire Aimé Cotton (CNRS))
22/02/2016 16:00
Poster
Ultracold species make it possible to build state-selected quantum systems with controllable interactions, which open the door to exploring fascinating phenomena. Among their many applications, ultracold systems can be used as quantum simulators, to study condensed-matter physics and quantum-controlled chemistry, to develop quantum information devices, and for ultraprecise spectroscopy....
Dr
Riccardo Faoro
(Joint Quantum Centre Durham-Newcastle, Durham University Durham, UK)
22/02/2016 16:00
Poster
Cooperative quantum optics has been one of the main research topics to emerge in the field of cold Rydberg gases. The first observations of optical nonlinearity at the single-photon level, and more recent demonstrations of single-photon transistors use a resonant two-photon excitation scheme. A key figure of merit is the optical depth per blockade sphere, which must be very high to ensure that...
Dr
Sergio Rota-Rodrigo
(Laboratoire Photonique, Numérique et Nanosciences (LP2N), lnstitut d'Optique Graduate School (IOGS), Université Bordeaux, France)
22/02/2016 16:00
Poster
We present the first step in the development of a stable fibered laser system operating at 461 nm for the laser cooling of Strontium atoms on the 1S0-1P1 line. This project fits in a long-term activity towards the development of a new generation of highly sensitive atom interferometers based on single photon transitions. This new development will particularly benefit to large-scale instruments...
M.
Pierre Fromholz
(LPTM Cergy), M.
Valentin Bois
(LPTM Cergy)
22/02/2016 16:00
Poster
We investigate the zero-temperature phase diagram of two-orbital SU($N$) fermionic models at incommensurate filling which are directly relevant to strontium and ytterbium ultracold atoms loading into a one-dimensional optical lattice.
Using a low-energy approach that takes into account explicitly the SU($N$) symmetry, we find that a spectral gap for the nuclear-spin degrees of freedom is...
Dr
thomas Zanon-Willette
(LERMA UPMC/Observatoire de paris)
22/02/2016 16:00
Poster
We present a new generation of quantum clocks absolutely free from ac Stark-shift caused by laser probing fields themselves based on generalized hyper-Ramsey resonances.
Sequences of composite laser pulses with specific selection of phases, frequency detunings and durations are combined to generate a very efficient and robust frequency locking signal with a perfect elimination of the...
Dr
Christophe Vaillant
(Durham University)
22/02/2016 16:00
Poster
Dense Feshbach spectra in ultracold collisions that are chaotic cannot
be analyzed in the same way as has been done for alkali metals. In
particular, good quantum numbers cannot be assigned to individual
resonances in chaotic systems, such as ultracold Er+Er and Dy+Dy.
Instead, a statistical approach must be taken.
We have calculated and statistically analyzed the Feshbach spectrum...
M.
Henri Lehec
(Laboratoire Aimé Cotton)
22/02/2016 16:00
Poster
Physical properties of Rydberg atoms pave the way to experimental control of the quantum state of mesoscopic ensemble of particles. Interactions between Rydberg atoms are large for interparticle distances in the micrometer range. They can be used to induce Rydberg blockade and generate entanglement between two[1,2] or even larger ensemble [3] of atoms. Nevertheless, Rydberg atoms lack some of...
M.
Moritz Höfer
(Max-Planck-Institut für Quantenoptik)
22/02/2016 16:00
Poster
In contrast to the more common alkali atoms, Ytterbium features a
strong decoupling between the nuclear and the electronic spin degree
of freedom and possesses a metastable excited state. In consequence,
interactions cannot be enhanced with standard magnetic
Feshbach resonances as in alkalis. We report on the discovery of a
new orbital interaction-induced Feshbach resonance in...
Dr
philippe lecheminant
(LPTM Cergy-Pontoise university)
22/02/2016 16:00
Poster
Alkaline-earth and ytterbium cold atomic gases make it possible to simulate SU(N)-symmetric fermionic systems in a very controlled fashion. Such a high symmetry is expected to give rise to a variety of novel phenomena in many-body quantum physics.
We describe the main exotic properties of alkaline-earth and ytterbium fermions loading into a one-dimensional optical lattice. In particular, a...
Ali Al-Masoudi
(Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany)
22/02/2016 16:00
Poster
We report on the implementation of a cryogenic optical lattice clock based on the ${}^{1}S_{0} \leftrightarrow {}^{3}P_{0}$ transition of ${}^{87}$Sr at PTB. While the atomic response to the blackbody radiation (BBR) field experienced by the atoms has been well characterized [1], our existing lattice clock is now limited to a total systematic uncertainty of $2 \times 10^{-17}$ [2] by our...
Dr
Amaury de Kertanguy
(LERMA)
22/02/2016 16:00
Poster
It is established since a long time (1926) that one can model atomic structure of alkaline species adding to the Coulomb potential a potential called the polarization potential $V_{p}(r)=-\frac{e^{2}}{2} \alpha_{D}\frac{1}{r^{4}}$.
(It acts same sign that the Coulomb potential. (Born 1960)
Our main purpose is to show that the effect of modification of the core structure of alkaline...
Dr
Andrea Orbán
(Laboratoire Aime Cotton)
22/02/2016 16:00
Poster
High efficiency production as well as the confinement and manipulation of ultracold molecules with external fields require a precise knowledge of their level structure. The transfer of the initially weakly bound ultracold molecules to their absolute ground state, relies on the existence of suitable electronically excited states allowing an efficient stimulated Raman adiabatic transfer...
Dr
Sebastian Blatt
(Max-Planck-Institut f{\"u}r Quantenoptik, Hans-Kopfermann-Stra{\ss}e 1, 85784 Garching, Germany)
22/02/2016 16:00
Poster
Within the last decade, fermionic alkaline earth atoms in optical lattices have become a platform for precision measurements, culminating in the realization of an atomic clock with the currently highest stability and accuracy at the $2 \times 10^{-18}$ level. In the meantime, quantum degenerate gases of all bosonic and fermionic isotopes of Sr have been realized. With the extension of the...
M.
Evgenij Pachomow
(Physikalisch-Technische Bundesanstalt), M.
Veit Peter Dahlke
(Physikalisch Technische Bundesanstalt)
22/02/2016 16:00
Poster
Compared to the intensively investigated two valence electron systems strontium and ytterbium, calcium offers by far the narrowest $^1$S$_0$ - $^3$P$_1$ intercombination line with a natural linewidth of 375 Hz at a wavelength of 657 nm. Using this transition for spectroscopy allows for highly precise measurements and might enable the application of optical Feshbach resonances with low atomic...
M.
Valentin Bois
(Laboratoire de Physique Théorique et Modélisation)
22/02/2016 16:00
Poster
Fermionic ultra-cold alkaline-earth atomic gases have recently acquired a great interest both experimental and theoretical. Recent experiences have shown that at very low energy, interactions between such atoms hardly depend, except via the fermionic statistic, on their nuclear spin. This so particular structure provides very high degrees of symetries to these systems, in particular the...
Dr
Joachim SACHER
(SACHER LASERTECHNIK)
22/02/2016 16:00
Poster
Abstract : A ridge waveguide laser stabilized by a compact holographic grating-cavity with an output power of 380 mW, a short-term optical linewidth of 18 kHz and a nearly diffraction-limited beam for saturation spectroscopy of rubidium is presented
Conclusion :
* Compact and spectrally narrow VHG stabilized ECDL with high output power of 380 mW at 780 nm
* Excellent laser stability and...
