# Events (2014)

## Seminar

Breakdown of Fermi liquid description in the normal phase of the BCS-BEC crossover**Speaker:**Tara Drake

**When:**04. Nov. 11:15

**Where:**Erwin Schrödinger Saal

The nature of the normal state of an ultracold Fermi gas in the BCS-BEC crossover regime is an interesting and controversial topic. While the many-body ground state remains a condensate of paired ferm ...

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Capabilities of superconducting circuits for QIP and QSI**Speaker:**Gerhard Kirchmair

**When:**23. Oct. 13:30

**Where:**Erwin Schrödinger Saal

I will start with a short introduction into superconducting circuits and discuss some of the basic interactions. I will continue with an overview of state of the art superconducting qubits technology, ...

Read more## Physics Colloquium

Quantum Simulation of Geometry and Topology**Speaker:**José Ignacio Latorre

**When:**21. Oct. 17:15

**Where:**Lecture Hall C

We present schemes for quantum simulation of geometry. In particular, we discuss how to implement a synthetic background curved space-time, as well as how to construct synthetic boundary conditions, ...

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Symmetric Tensor Network Algorithms**Speaker:**Ferdinand Tschirsich

**When:**16. Oct. 14:30

**Where:**Erwin Schrödinger Saal

Tensor networks are a promising tool to address quantum many body problems. They successfully capture the correct entanglement properties that exist in physically relevant states encountered e.g. in c ...

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Emergence of coherence in an uniform quasi-two dimensional Bose gas**Speaker:**Lauriane Chomaz

**When:**16. Oct. 09:00

**Where:**Erwin Schrödinger Saal

The dimensionality of a system strongly affects its physical properties; the phase transitions that take place and the type of order that arises depend on the dimension. In low dimensional systems ph ...

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Emergent non-adiabatic dynamics and geometric response in interacting systems**Speaker:**Anatoli Polkovnikov

**When:**15. Oct. 14:00

**Where:**Erwin Schrödinger Saal

First I will give a brief introduction to the geometric tensor. Its imaginary part is the Berry curvature and its real part defines the natural metric tensor. Both the Berry curvature and the metric t ...

Read more## Invited Talk

Unveiling the order of the high temperature superconductors**Speaker:**Subir Sachdev

**When:**10. Oct. 11:30

**Where:**Lecture Hall C

A central mystery posed by the Cu-based high temperature superconductors has been thenature of their electronic state at low hole density. I will survey the remarkable progress madeby recent experimen ...

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Controlling coherent state superpositions using qubit-photon entanglement.**Speaker:**Brian Vlastakis

**When:**30. Sep. 16:15

**Where:**Schrödinger Saal IQOQI

Quantum computation and error correction requires a large yet controllable Hilbert space. While many implementations use discrete quantum variables such as the energy of a two-level system to encode q ...

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Entangling Trapped Ions**Speaker:**Chris Bentley

**When:**10. Sep. 15:00

**Where:**IQOQI lecture hall

## Seminar

Towards Ultracold Mixtures of Lithium and Cesium**Speaker:**Asaf Paris-Mandoki

**When:**10. Sep. 09:30

**Where:**Erwin Schrödinger Saal

Ultracold mixtures hold the promise of understanding new phases of matter and collisions at very low energies. We have established an experiment for Bose-Fermi mixtures of 6Li and 133Cs, which are e ...

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Controlling Bose-Einstein condensates**Speaker:**Joe Hope

**When:**09. Sep. 14:00

**Where:**IQOQI lecture hall

## Talk

Manipulating noise and randomness in quantum systems: turning the nuisance into a resource**Speaker:**Andre Carvalho

**When:**09. Sep. 09:00

**Where:**IQOQI lecture hall

## Seminar

String Breaking in a (11)D quantum link model**Speaker:**Thomas Pichler

**When:**08. Sep. 16:00

**Where:**Erwin Schrödinger Saal

## Seminar

Majorana end modes: time independent and time dependent systems**Speaker:**Manisha Thakurathi

**When:**08. Sep. 10:00

**Where:**Erwin Schrödinger Saal

I will discuss our work on the topological phases of a p-wavesuperconducting wire and Kitaev model on honeycomb lattice.I will elaborate on some of the topological invariants whichcharacterize such ph ...

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Synthetic gauge fields in artificial dimensions for alkaline-earth atoms**Speaker:**Marie Rider

**When:**05. Sep. 10:00

**Where:**Erwin Schrödinger Saal

In this talk, we present our progress towards the understanding of quantum simulation platforms of a finite temperature topological condensed matter system with chiral edge states. We discuss a setup ...

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Ground state properties of one single impurity immersed into an uniform 3D BEC**Speaker:**Luis A. Peña Ardila

**When:**03. Sep. 11:00

**Where:**Erwin Schrödinger Saal

We investigate the ground state properties of a neutral impurity immersed into a Homogeneous dilute 3D Bose Gas.The interaction between bosons have been modeles as Hard sphere with scattering length a ...

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Quantum phase transitions in disordered topological insulators and superconductors**Speaker:**Alex Kamenev

**When:**04. Aug. 10:00

**Where:**Erwin Schrödinger Saal

I'll talk about quantum criticality in the quasi one-dimensional topological Anderson insulators and superconductors. It turns out that the systems may be fully described in terms of two paramete ...

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Weak dipolar interactions in trapped ion chains**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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Strongly correlated quantum walks and Hong-Ou-Mandel interference in optical lattices**Speaker:**Markus 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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Single atom and Bose-Einstein condensate in cavity QED**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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Local measurements in 3D and 2D Fermi gases**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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Bose-Einstein Condensation in a Magnetic Lattice**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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From few to many: Exploring quantum many-body systems one atom at a time**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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The shadow of a single atom**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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Sign reversal of the boson-boson interaction potential in Bose-Fermi mixtures under a synthetic magnetic field**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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Sub-Doppler laser spectroscopy of Rydberg states of potassium**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**Speaker:**Zav Shotan

**When:**27. May. 13:00

**Where:**Erwin Schrödinger Saal

## Seminar

Hybrid systems with dispersion forces**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 ...

Read more## Theory Colloquium

Quantum sensing and simulation with light**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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Experiments with multi-component two-electron fermions**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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Stability of the Coulomb phase in square ice**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**Speaker:**Ken O'Hara

**When:**15. May. 09:00

**Where:**Erwin Schrödinger Saal

## Seminar

Nanophotonics for quantum simulation**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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Observing, Understanding, then Eliminating Cold Collision Frequency Shifts in Fermi-Based Atomic Clocks**Speaker:**Kenneth O'Hara

**When:**08. May. 09:00

**Where:**Erwin Schrödinger Saal

## Seminar

Quantum Teleportation of Dynamics and Effective Interactions Between Remote Systems**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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Scaling symmetry of Efimov states in a Fermi-Bose Li-Cs mixture**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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Environment-dependent increase of integrated information in evolving animats**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 ...

Read more## Physics Colloquium

Frontiers Problems of the Josephson Effect: from macroscopic quantum phenomena to unconventional superconductivity**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 ...

Read more## Theory Colloquium

Many-body physics and non-local nonlinear optics with Rydberg atoms**Speaker:**Michael Fleischhauer

**When:**01. Apr. 15:00

**Where:**Erwin Schrödinger Saal

## Seminar

Progress of the Munich Fermi Gas Microscope**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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Synthetic Lorentz force in classical atomic gases via Doppler effect and radiation pressure**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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On universal Hamiltonian simulators**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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Open quantum many-body systems: -when interactions meet dissipations**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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Electromagnetically induced transparency and Dark-State Polaritons**Speaker:**Clemens Dlaska

**When:**03. Mar. 11:00

**Where:**Erwin Schrödinger Saal

## Seminar

Classification of Mixed State Topology in One Dimension**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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Strong parametric squeezing of thermal motion in a micromagnetomechanical system**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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The Magnetic Shape Memory Alloy Ni-Mn-Ga: Topography and Magnetic Domain Structure of Epitaxial Thin Films**Speaker:**Gesa Welker

**When:**14. Feb. 16:00

**Where:**Seminar room "east", 4th floor, Experimentalphysik

## Talk

QBism**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. ...

Read more## Physics Colloquium

Mechanical Systems in the Quantum Regime: Cavity Optomechanics**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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Realizing Spin Hamiltonians In Optical Lattices**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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Lower bounding convex roofs**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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Quantum metrology in realistic scenarios**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 ...

Read more## Physics Colloquium

Single molecular ions: Molecular physics at the most fundamental level**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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Ultracold rubidium atoms in optical lattices**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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Polaritons as quantum fluids of light: dynamics and many-body effects**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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Exploring long-range interactions in quantum gases**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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