Seminars


Seminars

On an irregular basis various Special Seminars take place at the MPQ. The seminars are organized by scientists of our divisions, administration or staff representatives. The location will be announced with the event.
Room: Hörsaal, Raum B 0.32 / New lecture hall, Room B 0.32

Special Seminar: Absolute Measurement of a THz Transition Frequency Referenced to a Magnetic Dipolar Transition in Ca+ ion

Special Seminar: Absolute Measurement of a THz Transition Frequency Referenced to a Magnetic Dipolar Transition in Ca+ ion
A three-photon Coherent Population Trapping is observed by the dark line it induces on the laser induced fluorescence of a laser-cooled Ca+ ion cloud. This dark line is referenced to a magnetic dipolar transition at 1.8 THz, between two fine-structure sub-state of a metastable state. We explore the performance of such a system for frequency metrology in the THz domain. [more]

Theodore Maiman Series: Physics and applications of epsilon-near-zero materials (Prof. Dr. Robert Boyd)

Physics and applications of epsilon-near-zero materials
In this talk, we describe some of the unusual optical properties of materials, known as epsilon-near-zero (ENZ) materials, for which the dielectric permittivity is very small. We describe some of the unusual geometrical optical properties of such materials and present theoretical predictions of how fundamental radiative properties are modified under such conditions. We also describe some of the nonlinear optical properties of these materials. Recent work has shown that optical materials can display an extremely large optical nonlinear response in their ENZ spectral region. [more]

Theodore Maiman Series: Laser Spectroscopy with Extreme Resolution (Prof. Dr. Nirgitta Bernhardt)

Laser Spectroscopy with Extreme Resolution
This talk is devoted to modern methods of laser spectroscopy, with the special focus on applications that require extreme ultraviolet (XUV) radiation and extreme resolution. [more]

Integrated quantum memories in diamond and silicon photonics (Dr. Ralf Riedinger)

Integrated quantum memories in diamond and silicon photonics
Linking remote quantum systems promises a host of new applications, ranging from distributed quantum computing to entanglement enhanced telescopes. Long distance quantum networks will require many nodes consisting of interfaces between local quantum memories and optical photons. While there are many contenders for these quantum nodes, nanophotonic implementations are particularly attractive: Once a single system works, it can be reproduced many times at minimal marginal costs. [more]

Single-shot interpretations of von Neumann entropy (Henrik Wilming)

Single-shot interpretations of von Neumann entropy
In quanum information theory, the von Neumann entropy usually arises in i.i.d settings, while single-shot settings are commonly characterized by (smoothed) Renyi entropies. I discuss new results that give single-shot interpretations to the von Neumann entropy under appropriate conditions. [more]
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