For information, please contact Paul Griffin. Note also the departmental colloquia are typically held on alternate Wednesdays.
Future Seminars
| Date | Location | Speaker | Title |
| 2017-04-28 | 8.11 | Laurent Sanchez-Palencia | Spreading of Quantum Correlations in Short- and Long-Range Interacting Systems |
Details of Next Seminar
Speaker: Laurent Sanchez-Palencia, Ecole Polytechnique, CNRS, Univ Paris-Saclay)
Date: 28th April 2017
Time: 10am
Location: 8.11
Title: Spreading of Quantum Correlations in Short- and Long-Range Interacting Systems
Abstract:
The out-of-equilibrium dynamics of correlated quantum systems is attracting considerable attention sparked by the emergence of new quantum devices that combine long coherence times, slow dynamics, and precise control of parameters. They concern a variety of systems including ultracold atoms, artificial ion crystals, electronic circuits, spin chains in organic conductors, and quantum photonic systems for instance. One of the most fundamental features of the dynamics of quantum systems is the existence of so-called Lieb-Robinson bounds to the propagation of correlations. Such bounds have fundamental implications on propagation of information, spreading of quantum correlations, and the dynamics of thermalization processes.
Here, we study the dynamics of quantum correlations in various lattice systems using a combination of numerical and analytical many-body approaches. For quantum systems with short-range interactions, our results confirm ballistic spreading of quantum correlations in 1D and 2D Bose-Hubbard models and allow for accurate determination of the cone-like velocity. In dimension higher than two, we show that the correlation pattern is determined by many-body interference effects and that the wave front is characterized by a ballistic spreading within the Manhattan metrics rather than Euclidian metrics, hence producing a square rather than circular correlation front.
In long-range interacting systems, various extensions of the Lieb-Robinson bounds have been proposed. For interactions decaying algebraically in space like 1/R^a in a square lattice of dimension D, universal bounds predict super-ballistic spreading for a > D and no bound for a<=d.
While compatible with those bounds, our results show that
(i)~the quantum speed limit set by Lieb-Robinson bounds is most often not reached,
(ii)~the spreading of quantum correlations is often sub-ballistic,and that it is both
(iii)~ model-dependent and
(iv)~observable-dependent.
These conclusions are based on the systematic numerical study of the dynamics of two models characterized by the same universal bounds but that show completely different behaviors and on the study of various observables. These two models, namely the extended Ising and Bose-Hubbard models, are realizable within ultracold atom or ion systems.
The numerics are both qualitatively and quantitatively supported by an analytical approach based on exact dynamics of many-body excitations.
Our results shed new light on the dynamics of quantum correlations in short- and long-range interacting systems. They pave the way to future experimental investigations and application to quantum communications in new engineered quantum devices.
Previous Seminars
| 2017-03-30 | Matthias Sonnleitner, University of Glasgow |
Neglected terms and hidden gems in atom-light interaction |
| 2017-02-16 | Irénée Frérot, ENS de Lyon |
Unveiling quantum correlations in many-body systems |
| 2017-02-07 | Anton Afanasiev Institute of Spectroscopy, Russian Academy of Sciences |
From atom optics to light synthesis on a nanometer-scale size |
| 2016-12-09 | Tiffany Hart University of Oxford |
Multiple-radiofrequency dressed adiabatic potentials |
| 2016-11-23 | Dirk Schuricht University of Utrecht |
Time evolution and relaxation in strongly correlated quantum systems |
| 2016-10-26 | Remi Gieger SYRTE, Observatoire de Paris |
Low Frequency Gravitational Wave Detection with Ground Based Atom Interferometer Arrays |
| 2016-06-01 | Demosthenes Kivotides Chemical and Process Engineering Strathclyde |
Decay of finite temperature superfluid helium-4 turbulence |
| 2016-04-06 | Kevin Weatherill, Durham University |
Thermal Rydberg vapours: quantum optics, terahertz detection and phase transitions |
| 2016-03-02 | Waldemar Herr, University of Hannover |
The QUANTUS collaboration: Matter-wave optics in microgravity |
| 2016-02-17 | Marzena Szymanska UCL |
Non-equilibrium phenomena with quantum fluids of light |
| 2015-11-26 | Jose T Mendonça IPFN/IST, Universidade de Lisboa |
Mean-Field Effects In Ultra-Cold Matter: From Bose-Einstein Condensates To Rydberg Plasmas |
| 2015-11-18 | Matthias Keller University of Sussex |
High Resolution Spectroscopy of Molecular Ions |
| 2015-07-07 | Peter Schauss, MPQ & LMU |
Local study of quantum transport close to and far away from equilibrium |
| 2015-07-07 | Johannes Zeiher, MPQ & LMU |
Many body physics with Rydberg S- and P-states under the microscope |
| 2015-07-07 | Alex Glätzle, Innsbruck |
Designing Frustrated Quantum Magnets with Laser-Dressed Rydberg Atoms |
| 2015-07-07 | Marco Mattioli, Innsbruck |
From classical to quantum non-equilibrium dynamics of Rydberg excitations in optical lattices |
| 2015-06-04 | Raul Garcia-Patron, Université Libre de Bruxelles |
Ultimate Communication Capacity of Quantum Optical Channels |
| 2015-05-28 | Qiang Lin, Institute of Optics, Zhejiang University |
The Investigation of μ-Gal-Level Cold Atom Gravimeter for Field Applications |
| 2015-06-01 | Immanuel Bloch, LMU & MPQ |
Probing and Controlling Ultracold Quantum Gases – from Single Atoms to Rydberg Dressing |
| 2015-05-19 | Thierry Guillet, Université de Montpellier |
Nitride and ZnO-based photonics: from non-linear optics to novel microlasers |
| 2015-05-18 | Alessandro Fedrizzi, The University of Queensland |
On the experimental reality of the wavefunction |
| 2015-04-29 | Ben Lanyon, IQOQI, Innsbruck |
Quantum many-body physics with strings of trapped ions |
| 2015-04-01 | Jacob Dunningham, University of Sussex |
Sensing at the quantum limit |
| 2015-03-18 | Chris Hooley, University of St. Andrews |
Bragg localisation, Anderson localisation, and the failure of thermalisation: the rich physics of quantum quenches in cold-atom systems |
| 2015-01-27 | Markus Greiner, Harvard University |
Measuring Entanglement Entropy in Synthetic Quantum Matter |
| 2015-01-27 | Fabio Biancalana, Heriot-Watt |
Interaction between positive and negative frequencies in nonlinear optics |
| 2014-11-19 | Torsten Hartmann, Leibniz Universität Hannover |
Towards ultracold polar NaK molecules |
| 2014-11-05 | Simon Gardiner, Durham University & JQC |
Bright Matter-Wave Solitons, Interferometry, and Rotational Sensing |
| 2014-09-04 | Gangqiang Liu, University of Pittsburgh |
Half-vortex in a Polariton Ring Condensate |
| 2014-09-04 | Jonathan Keeling, University of St. Andrews |
Superradiance of cold atoms in optical cavities |
| 2014-08-21 | Arnaud Gloppe, CNRS |
Bidimensional nano-optomechanics and topological backaction in a non-conservative radiation force field |
| 2014-07-23 | Gian-Luca Oppo, CNQO & ICS, Strathclyde |
Turbulent, spiral and rogue waves in coherent optical systems |
| .2014/05/28 | Deborah Kane Macquarie University, Sydney |
Nonlinear dynamics of experimental laser systems including complexity analysis |
| 2014-04-09 | Mike Charlton Swansea University |
Antihydrogen Trapping and Physics |
| 2014-03-13 | Jun Ye JILA | Making the world’s best clock |
| 2014-02-20 | Charles Adams Durham University |
Strongly interacting photons! |
| 2014-02-19 | Jean Dalibard ENS |
Exploring Flatland with Cold Atoms (Departmental Colloquium) |
| 2014-02-13 | Leo Hollberg Stanford University |
Atoms and Quantum Transitions Probed with Lasers For Real-World Applications (SU2P/SUPA/IMPP Quantum Technologies Colloquium) |
| 2014-02-03 | John Kitching NIST |
Chip-scale Atomic Devices: Miniature Precision Instruments using Atoms, Lasers and MEMS |
| 2014-01-29 | Peter Barker University College London |
From molecules to the mesoscale: Cooling and manipulating complex particles |
| 2014-01-20 | Georgios Siviloglou Massachusetts Institute of Technology |
Ultracold rubidium atoms in optical lattices |
| 2014-01-16 | Bruno Peaudecerf Ecole Normale Supérieure, Paris |
Feedback loops applied to the measurement and control of light in a cavity |
| 2014-01-15 | Giovanni Modugno LENS / Università di Firenze |
Measurement of the mobility edge in 3D Anderson localization |
| 11/12/13 | Neal Radwell / Thomas Clark University of Glasgow |
Spatially Dependent EIT from Structured Light |
| 29/11/13 | Igor Lesanovsky University of Nottingham |
Dissipative binding and glassy relaxation in Rydberg lattice gases |
| 27/11/13 | Danny Segal Imperial College |
Coulomb Crystals and Motional Sideband Spectroscopy of Ca+ Ions in a Penning Trap |
| 13/11/13 | Patrick Windpassinger University of Mainz |
Emulating magnetism with ultracold atoms in optical lattices |
| 30/10/13 | Jonathan Simon University of Chicago |
Engineering Photonic Topological & Quantum Materials |
| 23/10/13 | Charles Wang University of Aberdeen |
Theoretical and Experimental Development of Quantum Sensing Methodology (Departmental Colloquium) |
| 16/10/13 | Herwig Ott TU Kaiserslautern |
Quantum Zeno Dynamics with Ultracold Quantum Gases |
| 9/10/13 | Jom Luiten Technische Universiteit Eindhoven | Cool Beams for Femtosecond Electron Imaging (Departmental Colloquium) |
| 4/10/13 | Lauri Toikka University of Turku |
Ring Dark Solitons and Self-Interference in Toroidal Bose-Einstein Condensates |
| 1/10/13 | Josh Toomey Macquarie University |
Complexity Analysis of Experimental Nonlinear Laser Systems |
| 25/9/13 | Aidan Arnold University of Strathclyde |
Cool things you can do with atoms (Departmental Colloquium) |
| 19/9/13 | Quentin Baudouin Institut Non Linéaire de Nice |
Random Lasing in Cold Atoms |
| 29/8/13 | Robin Kaiser Institut Non Linéaire de Nice |
Lévy flight of photons in atomic vapours |
| 19/6/13 | Saijun Wu Swansea University |
Laser cooling at D1-Line and Prospects of Holographic Single Atom Detection |
| 18/6/13 | Nicola Piovella Università degli Studi di Milano |
Cooperative Scattering by Cold Atoms: Theory and Experiments |
| 24/5/13 | Andrew Shields Toshiba |
Quantum Communications in the Real World |
| 15/5/13 | Florian Schreck University of Innsbruck |
Teaching an old dog new tricks: experiments with quantum degenerate strontium |
| 13/5/13 | Jacob Sherson Aarhus University | Quantum control: a serious game |
| 1/5/13 | Andrew Daley University of Pittsburgh |
Exploring non-equilibrium many-body dynamics with cold atoms (Departmental Colloquium) |
| 22/4/13 | David Miller Stanford |
How to design any linear optical component and how to avoid it (Departmental Colloquium) |
| 15/4/13 | Chris Foot University of Oxford |
New techniques for investigating cold/quantum matter |
| 28/3/13 | Marina Samoylova Università degli Studi di Milano |
Collective Scattering of Light in High-Finesse Ring Cavities and Optical Lattices |
| 26/3/13 | Peter Horak University of Southampton |
Optomechanical effects: From single atoms to optical fibres |
| 18/3/13 | Mauro Paternostro Queen’s University Belfast |
A route to quantum effects in mesoscopic systems |
| 6/3/13 | Daniele Faccio Heriot-Watt |
Light in moving media (Departmental Colloquium) |
| 27/2/13 | Vincent Boyer University of Birmingham |
Quantum optics in the transverse dimension: squeezing the local quantum fluctuations of a light field |
| 13/2/13 | Jonathan Leach Heriot -Watt |
How to directly measure a quantum wavefunction |
| 23/1/13 | Christophe Salomon ENS |
From Ultracold Fermi Gases to Neutron Stars (Departmental Colloquium) |
| 16/1/13 | Mike Tarbutt Imperial College | Cold molecules as probes of new physics |
| 15/1/13 | Andrii Sotnikov Goethe University Frankfurt |
Perspectives in Approaching Quantum Magnetism in Optical Lattices |
| 12/12/12 | Ian Walmsley University of Oxford |
Entangbling – quantum correlations in diamond (Departmental Colloquium) |
| 5/12/12 | Ifan Hughes Durham University | Atom-light interactions at high densities and high magnetic fields |
| 21/11/12 | Axel Kuhn University of Oxford |
Photonic Qubits, Qutrits and Ququads in Linear Optical Quantum Circuits |
| 24/10/12 | Zoran Hadzibabich Cambridge University |
Quantum-quenched and superheated Bose-condensed atomic gases |
| 17/10/12 | Sonja Franke-Arnold University of Glasgow |
The world through a rotating window (Departmental Colloquium) |
| 8/10/12 | Rob Scholten University of Melbourne |
Quantum measurement in living cells, and high-coherence electron bunches from cold atoms |
| 26/9/12 | Philipp Treutlein University of Basel |
Quantum metrology with a scanning probe atom interferometer |
| 31/8/12 | Mark Saffman University of Wisconsin/Madison |
Trapping big atoms in small bottles for quantum computing and nonlinear, atom optics |
| 28/6/12 | John Harvey University of Auckland |
Similariton Generation in Optical Fibre Amplifiers |
| 20/6/12 | Peter Krüger University of Nottingham |
Atom chips |
| 16/5/12 | Dieter Jaksch University of Oxford |
Strongly driven coherent quantum systems |
| 25/4/12 | Patrik Öhberg Heriot-Watt University |
Artificial electromagnetism |
| 4/4/12 | Mete Atatüre University of Cambridge |
Spins and Photons of Quantum Dots |
| 28/3/12 | Matt Jones Durham University |
Spatial correlations in cold Rydberg gases |
| 14/3/12 | Robin Kaiser Institut Non Lineaire de Nice |
Coherence effects in light transport : Dicke vs Anderson localization |
| 5/10/11 | Elmar Haller University of Innsbruck |
Interacting quantum gases in optical lattice potentials (Departmental Colloquium) |