Events (2014)

Seminar

Weak dipolar interactions in trapped ion chains
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Speaker: R Ozeri
When: 24. Jul. 14:15
Where: IQOQI lecture hall

In this talk I will review two recent experiments in which weak, magnetic and electric, dipolar interactions were measured in between ultracold atoms at micrometer separation. In the first experiment, ...

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Seminar

Strongly correlated quantum walks and Hong-Ou-Mandel interference in optical lattices
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Speaker: M Greiner
When: 24. Jul. 09:15
Where: Erwin Schrödinger Saal

With quantum gas microscopy we are now able to take the control of atoms in an optical lattice to the next and ultimate level of high fidelity addressing, manipulation and readout of single particles. ...

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Seminar

Strongly correlated quantum walks and Hong-Ou-Mandel interference in optical lattices
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Speaker: M Greiner
When: 24. Jul. 09:00
Where: Erwin Schrödinger Saal

With quantum gas microscopy we are now able to take the control of atoms in an optical lattice to the next and ultimate level of high fidelity addressing, manipulation and readout of single particles. ...

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Seminar

Single atom and Bose-Einstein condensate in cavity QED
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Speaker: Moonjoo Lee
When: 14. Jul. 15:00
Where: Erwin Schrödinger Saal

Strong coupling between an optical cavity and neutral atoms gives various opportunities to investigate quantum physics. Firstly, I talk about 3D imaging of vacuum fluctuations in a cavity based on the ...

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Seminar

Local measurements in 3D and 2D Fermi gases
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Speaker: Chris Vale
When: 02. Jul. 17:00
Where:

I will describe our recent studies of strongly interacting ultracold Fermi gases in two and three dimensions. In 3D we have measured the local (homogeneous) density-density response function at unita ...

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Seminar

Bose-Einstein Condensation in a Magnetic Lattice
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Speaker: Peter Hannaford
When: 02. Jul. 16:30
Where: Erwin Schrödinger Saal

Magnetic lattices based on periodic arrays of microtraps produced by magnetic microstructures provide a promising complementary tool to optical lattices, and have the potential to create lattices of a ...

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Seminar

From few to many: Exploring quantum many-body systems one atom at a time
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Speaker: Thomas Lompe
When: 24. Jun. 09:00
Where: Erwin Schrödinger Saal

Experiments with ultracold gases have been extremely successful in studying many body systems, such as Bose Einstein condensates or fermionic superfluids. In our experiments we have developed new expe ...

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Seminar

The shadow of a single atom
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Speaker: Dave Kielpinski
When: 20. Jun. 11:30
Where: IQOQI lecture hall

We have implemented single-atom imaging with unprecedented resolution using phase Fresnel lenses. This scalable imaging solution will enable parallel quantum repeaters based on ion-photon entanglement ...

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Seminar

Sign reversal of the boson-boson interaction potential in Bose-Fermi mixtures under a synthetic magnetic field
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Speaker: Tomasz Polak
When: 12. Jun. 11:00
Where: Erwin Schrödinger Saal

I will discuss the mutually coupled, strongly interacting bosonic and noninteracting fermionic, species of unequal masses in the regime were the retardation effects are an important part of the physic ...

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Seminar

Sub-Doppler laser spectroscopy of Rydberg states of potassium
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Speaker: Silva Mezinska
When: 05. Jun. 09:00
Where: Erwin Schrödinger Saal

Seminar

Three-body recombination at vanishing scattering lengths in an ultracold Bose gas
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Speaker: Zav Shotan
When: 27. May. 13:00
Where: Erwin Schrödinger Saal

Seminar

Hybrid systems with dispersion forces
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Speaker: Sofia Ribeiro
When: 26. May. 16:00
Where: Erwin Schrödinger Saal

Over the last few years, a variety of hybrid quantum systems have been proposed and already experimentally demonstrated. The elementary building blocks of those systems are of different nature, each o ...

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Theory Colloquium

Quantum sensing and simulation with light
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Speaker: Jake Taylor
When: 22. May. 15:00
Where: Erwin Schrödinger Saal

Advances in quantum optics in novel domains — such as with superconducting circuits or mechanical oscillators — lead to intriguing new possibilities for observing and controlling quantum behavior ...

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Seminar

Experiments with multi-component two-electron fermions
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Speaker: Leonardo Fallani
When: 22. May. 09:00
Where: Erwin Schrödinger Saal

I will report on recent experiments performed at LENS with ultracold quantum gases of two-electron Yb atoms. In particular, I will focus on the experimental realization of multi-component 1D liquids o ...

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Seminar

Stability of the Coulomb phase in square ice
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Speaker: Louis-Paul Henry
When: 20. May. 14:00
Where: Erwin Schrödinger Saal

Seminar

Observing, Understanding, then Eliminating Cold Collision Frequency Shifts in Fermi-Based Atomic Clocks
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Speaker: Ken O'Hara
When: 15. May. 09:00
Where: Erwin Schrödinger Saal

Seminar

Nanophotonics for quantum simulation
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Speaker: Alejandro Gonzalez-Tudela
When: 13. May. 15:00
Where: Erwin Schrödinger Saal

Photonic Crystals (PhCs) are periodically patterned dielectric structures that allow to engineer and control the propagation of light at the nanoscale. In this seminar, we show how PhCs allow to buil ...

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Seminar

Observing, Understanding, then Eliminating Cold Collision Frequency Shifts in Fermi-Based Atomic Clocks
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Speaker: Kenneth O'Hara
When: 08. May. 09:00
Where: Erwin Schrödinger Saal

Seminar

Quantum Teleportation of Dynamics and Effective Interactions Between Remote Systems
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Speaker: Christine Muschik
When: 07. May. 11:00
Where: Erwin Schrödinger Saal

Most protocols in Quantum Information Science are discrete in the sense that they consist of a series of unitary operations and measurements which are applied sequentially. However, some implementatio ...

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Seminar

Scaling symmetry of Efimov states in a Fermi-Bose Li-Cs mixture
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Speaker: Cheng Chin
When: 07. Apr. 11:00
Where: Erwin Schrödinger Saal

Discrete scaling symmetry, shown in Russian nesting dolls and in the self-similar structure of snow flakes, displays a unique form of beauty in art and in nature. In quantum world, the discrete scalin ...

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Talk

Environment-dependent increase of integrated information in evolving animats
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Speaker: Larissa Albantakis
When: 02. Apr. 15:00
Where: Erwin Schrödinger Saal

Natural selection favors the evolution of brains that are able to capture features of the causal structure of the environment relevant for fitness. Here we investigate the evolution of small, adaptive ...

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Physics Colloquium

Frontiers Problems of the Josephson Effect: from macroscopic quantum phenomena to unconventional superconductivity
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Speaker: Francesco Tafuri
When: 01. Apr. 17:15
Where: Lecture Hall C

I will review some general problems of superconductivity through the study of the Josephson effect, which has been in the last 50 years a continuous source of inspiration and progress in different fie ...

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Theory Colloquium

Many-body physics and non-local nonlinear optics with Rydberg atoms
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Speaker: Michael Fleischhauer
When: 01. Apr. 15:00
Where: Erwin Schrödinger Saal

Seminar

Progress of the Munich Fermi Gas Microscope
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Speaker: Thomas Reimann
When: 27. Mar. 09:00
Where: Erwin Schrödinger Saal

Recent experiments with ultracold quantum gases have demonstrated the power of single-site resolved detection in optical lattices for the study of (strongly correlated) bosonic many-body systems.Here, ...

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Seminar

Synthetic Lorentz force in classical atomic gases via Doppler effect and radiation pressure
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Speaker: Hrvoje Buljan
When: 25. Mar. 09:15
Where: Erwin Schrödinger Saal

The quest for synthetic magnetism in quantum degenerate atomic gases is motivated by the research of controllable quantum emulators, which could mimic complex quantum systems. Recent experiments in Bo ...

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Talk

On universal Hamiltonian simulators
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Speaker: Gemma De las Cuevas
When: 05. Mar. 15:00
Where: Erwin Schrödinger Saal

Spin models are a broad class of models widely used in condensed matter and other complex systems, which exhibit very rich physics, such as different phases, symmetries, and different universality cla ...

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Seminar

Open quantum many-body systems: -when interactions meet dissipations
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Speaker: Zi Cai
When: 04. Mar. 13:30
Where: Erwin Schrödinger Saal

Understanding quantum systems embedded into environment is of particular theoretical and practical importance. The situation becomes particularly interesting and complex when the system itself is alre ...

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Seminar

Electromagnetically induced transparency and Dark-State Polaritons
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Speaker: Clemens Dlaska
When: 03. Mar. 11:00
Where: Erwin Schrödinger Saal

Seminar

Classification of Mixed State Topology in One Dimension
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Speaker: Sebastian Huber
When: 27. Feb. 13:00
Where: Erwin Schrödinger Saal

We show how to apply the concepts of identifying and classifying symmetry protected topological phases in 1D to the case of a general mixed state. The concepts are reviewed using a concrete spin-1 mod ...

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Seminar

Strong parametric squeezing of thermal motion in a micromagnetomechanical system
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Speaker: Andrea Vinante
When: 19. Feb. 14:00
Where: Erwin Schrödinger Saal

Parametric excitation of a resonator at twice the resonance frequency is conceptually the simplest way to produce squeezing and amplification of the resonator quadratures. Classical parametric squeezi ...

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Talk

The Magnetic Shape Memory Alloy Ni-Mn-Ga: Topography and Magnetic Domain Structure of Epitaxial Thin Films
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Speaker: Gesa Welker
When: 14. Feb. 16:00
Where: Seminar room "east", 4th floor, Experimentalphysik

Talk

QBism
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Speaker: Rüdiger Schack
When: 29. Jan. 16:00
Where: Erwin-Schödinger-Saal, IQOQI

This talk introduces QBism, or Quantum Bayesianism, and explains how QBism eliminates the measurement problem and other notorious problems that arise in the interpretation of quantum mechanics. ...

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Physics Colloquium

Mechanical Systems in the Quantum Regime: Cavity Optomechanics
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Speaker: Tobias Kippenberg
When: 21. Jan. 17:15
Where: Erwin-Schödinger-Saal, IQOQI

The mutual coupling of optical and mechanical degrees of freedom via radiation pressure has been asubject of interest in the context of quantum limited displacements measurements for gravity wavedetec ...

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Seminar

Realizing Spin Hamiltonians In Optical Lattices
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Speaker: Christian Gross
When: 21. Jan. 10:00
Where: Erwin-Schödinger-Saal, IQOQI

The quantum simulation of many-body systems with neutral ultra-cold atoms in optical lattices showed fast progress in the recent years. Especially, spin Hamiltonians can now be realized and studied in ...

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Talk

Lower bounding convex roofs
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Speaker: Tobias Moroder
When: 16. Jan. 14:00
Where: Erwin-Schödinger-Saal, IQOQI

The convex roof construction plays an important role in quantum information theory. In this work we develop a general method to find lower bounds on the convex roof for a large class of functions usin ...

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Talk

Quantum metrology in realistic scenarios
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Speaker: Janek Kolodynski
When: 15. Jan. 15:00
Where: Erwin-Schödinger-Saal, IQOQI

Quantum metrology offers an enhanced performance in experiments suchas gravitational wave-detection, magnetometry and atomic clocksfrequency calibration. Under the idealistic assumption of nodecoheren ...

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Physics Colloquium

Single molecular ions: Molecular physics at the most fundamental level
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Speaker: Michael Drewsen
When: 14. Jan. 17:15
Where: lecture hall C

The past two decades there has been a tremendous progress in experiments with single trapped atomic ions. Presently, e.g., the most precise optical frequencies have been measured with single atomic io ...

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Seminar

Ultracold rubidium atoms in optical lattices
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Speaker: Georgios Siviloglou
When: 10. Jan. 11:00
Where: Erwin-Schödinger-Saal, IQOQI

Loading ultracold atomic gases in optically induced lattices is an indispensable ingredient in realizing interesting Hamiltonians and thus a cornerstone of quantum emulation. In this talk we will firs ...

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Seminar

Polaritons as quantum fluids of light: dynamics and many-body effects
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Speaker: Hugo Tercas
When: 10. Jan. 10:00
Where: Erwin-Schödinger-Saal, IQOQI

Due to the strong coupling between photons and excitons in semiconductor microcavities, the non-linear interactions between the photons become sufficiently large to envisage collective effects. One of ...

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Seminar

Exploring long-range interactions in quantum gases
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Speaker: Kristian Baumann
When: 07. Jan. 13:30
Where: Erwin-Schödinger-Saal, IQOQI

Advances in the manipulation of ultracold atomic gases are opening new frontiers in the quest to better understand strongly correlated matter. By exploiting long-range and anisotropic interactions in ...

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