upcoming events

Tuesday 09. October 2018

IMPRS Annual Meeting 2018


Venue: Hotel Stempferhof, Badangerstraße 33, 91327 Gößweinstein

Programme includes: invited talks, block lectures, student talks, panel discussion, poster session

Friday 23. February 2018

Digital electronic analysis, synthesis, and manipulation of the full optical field


Organisation: Max Planck Institute for the Science of Light / Russell Division

Speaker: Dr Peter Winzer, Director (Optical Transmission Subsystems Research, NOKIA Bell Labs, Crawford Hill, USA)

Place: MPL / seminar room 1.500


Optical communication systems have seen fundamental technological changes over the past 10 years that have completely redefined our ability to analyse, synthesize, and manipulate optical fields across all their physical dimensions: time/frequency, quadrature, polarization, and spatial mode content. State-of-the-art optical capabilities include stable low-linewidth lasers, programmable GHz-resolution optical filters, and spatial light modulators. Electronics capabilities include digital coherent subsystems based on high-speed (up to 100-GHz) analog-to-digital and digital-to-analog converters, and digital electronic signal processors based on Field Programmable Gate Arrays that can handle a Tbit/s of real-time data. These capabilities are about to fundamentally blur the boundaries between optical and electronic signal processing, asking for a combined view on optics and high-speed digital electronics in the analysis, synthesis, and manipulation of the full optical field, and enabling radically new opportunities across a wide range of photonics disciplines. After reviewing modern digital coherent detection and space-division multiplexing using multiple-input-multiple-output (MIMO) processing to scale fiber-optic network capacities, with new levels of physical-layer security as a by-product, we will take a glimpse at the vast possibilities enabled by fully digital light manipulation outside of telecom, from optical coherence tomography to endoscopic imaging to arbitrarily nonlinear and time-variant interferometry to ultra-fast optical tweezers.

Thursday 22. February 2018

Subradiance and Selective Radiance in Atomic Arrays


Organisation: Max Planck Institute for the Science of Light / Genes Research Group

Speaker: Mariona Moreno-Cardoner, ICFO (Institute of Photonic Science), Barcelona, Spain

Place: MPL / seminar room 1.500


Achieving controlled coherent interactions between photons and atomic media is a central goal in quantum optics, and essential for many applications in quantum information processing and quantum metrology. Spontaneous emission, in which photons are absorbed by atoms and then re-scattered into undesired channels poses a fundamental limitation in all these tasks. In typical theoretical treatments of atomic ensembles, it is assumed that this re-scattering occurs independently, and at a rate given by a single isolated atom, which in turn gives rise to standard limits of fidelity in applications such as quantum memories for light or photonic quantum gates. However, this assumption can be in fact dramatically violated. In particular, it has long been known that spontaneous emission of a collective atomic excitation can be significantly enhanced or suppressed through strong interference in emission between atoms — the physics of super- and sub-radiance. While these concepts are not new, the physics underlying these effects have not been completely understood. 

In this talk we will first discuss a theoretical framework that captures multiple scattering and interference of light while propagating through the atoms [1]. Using this formalism, we will then show how sub-radiant states in a periodic atomic chain acquire an elegant interpretation in terms of optical modes that are “guided” by the array, which only emit due to scattering from the boundaries of the finite system. Then, we will introduce the new concept of selective radiance. Whereas sub-radiant states experience a reduced coupling to all optical modes, selectively radiant states are tailored to simultaneously radiate efficiently into a desired channel and to suppress emission into undesired directions, thus enhancing the atom-light interface. We will show that these states naturally appear in chains of atoms coupled to nanophotonic structures. As a relevant application of how they can be exploited, we will show that selectively radiant states allow for a photon storage error that performs exponentially better with number of atoms than previously known bounds.

[1] A. Asenjo-Garcia, J. D. Hood, D. E. Chang, H. J. Kimble, Phys. Rev. A 95, 033818 (2017).

[2] A. Asenjo-Garcia, M. Moreno-Cardoner, A. Albrecht, H. J. Kimble, D. E. Chang, Phys. Rev. X 7, 031024 (2017).

Thursday 22. February 2018

IMPRS monthly meeting
Tour at INTEGO


Organisation: Marc Pleinert (FAU/ Institute of Optics, Information and Photonics)

What: Tour at INTEGO (develops and produces camera inspection systems)

Where: Henri-Dunant-Str. 8, 91058 Erlangen

What else: Please register for the tour by filling out the doodle (link has been sent by e-mail) until February 14th!