Tanja Tarvainen, Professor, University of Eastern Finland (UEF), Computational Imaging and Modelling, Vice head of the department
Tanja Tarvainen is a professor at the Department of Applied Physics at the University of Eastern Finland. She investigates and develops computational methods for optical and ultrasonic inverse problems such as tomographic imaging and therapy in the framework of Bayesian inverse problems. The tomographic methods include purely light based modalities such as diffuse optical tomography and coupled physics imaging such as photoacoustic tomography. In addition, modelling and computational methods for light transport and ultrasound propagation are studied, and prototype instrumentation for the techniques are developed.
Talk Title: Tomography using light and sound
Talk Abstract: Optical imaging uses visible or near-infrared light to interrogate the internal properties of biological tissues based on endogenous (e.g. haemoglobin) or exogenous (e.g. contrast agents) contrast. Several optical imaging modalities have been developed, including, for example, diffuse optical tomography. In these imaging modalities, the physiological nature of chromophores in tissue gives rise to a unique contrast. However, the complex behaviour of light propagation results in poor resolution, due to the strongly ill-posed and non-linear nature of the image reconstruction problem. Combining light with ultrasound in so-called coupled physics imaging can overcome these limitations. For example, in photoacoustic imaging, the unique contrast of light is combined with the resolution of ultrasound utilising photoacoustic effect. In this talk, I will discuss imaging with light with a focus on tomographic imaging. Principle of diffuse optical tomography and photoacoustic tomography together their applications are reviewed. Further, I will discuss on light propagation in tissue and tomography, and how an ill-posed tomography problem can be solved using computational methods.
Tim Taminiau, Team leader, QuTech, Delft University, Quantum Internet Division
Tim Taminiau is team leader at QuTech. He aims to realize spin-based quantum networks for quantum computation and for investigating the fundamentals of quantum information. Tim’s group uses defect centers in solids to realize controlled quantum registers of multiple coupled electron and nuclear spins and connects these registers into optically connected networks using photons. See more Here.
Talk Title: Quantum networks, simulations and computations with spin qubits in diamond
Talk Abstract: Optically active spins in diamond provide a promising platform for quantum networks, quantum computation and quantum simulations. These spins combine excellent coherence times and multi-qubit control with the ability to realize optically mediated entanglement between devices [1,2,3].
In this talk, I will present the recent progress in realizing distributed quantum information processing over quantum networks based on spins in diamond. In particular, I will discuss how the electron spin of a single nitrogen-vacancy centre can be used to control multiple spins in its environment and realize quantum processors with 10+ qubits [4,5,6]. I will present that such quantum processors can be used to realize small-scale quantum error correction codes and quantum simulations. Finally, I will discuss the open challenges for combining these multi-qubit processors with optically mediated entanglement to realize large-scale quantum networks.
 Abobeih et al., Nature Commun. 9:2552, 2018
 Matteo et al., Science, 372, 259, 2021
 Bartling et al., arXiv:2103.07961
 Abobeih et al., Nature 576, 411, 2019
 Bradley et al., Phys. Rev. X. 9, 031045, 2019
 Degen et al., Nature Commun. 12, 3470 (2021)
Jean-Emmanuel Broquin received an Engineering Degree in Physics of Microelectronic Devices from the Ecole Nationale Supérieure de Physique de Grenoble (France) in 1993, and a Master degree in Optics Electromagnetism and Optoelectronics from the Institut National Polytechnique de Grenoble (France) the same year. Since the completion of his PhD on Erbium-Doped Waveguide amplifiers in 1997, he has been working on both active and passive integrated optics devices (mainly realized on glass substrate). In 1999, he has been appointed Associate Professor at the Grenoble Institute of Technology (G-InP, France) and became a Full Professor in 2007. His main teaching activities are microtechnology, optoelectronics and integrated optics. After having been in charge of the Photonics group of the IMEP (Institute for Microelectronics, Electromagnetism and Photonics), and the Director of this 150 people research institute, he is now in charge of its dissemination and industrial partnerships. Jean-Emmanuel Broquin has authored or co- authored more than 100 articles and conferences in the field of integrated optics devices. In 2020, Pr Broquin has been awarded the Distinguished Chair of the Nokia Foundation with the Institut Français de Finlande and he became a Docent of the University of Eastern Finland in 2021. See more Here.
Talk Title: Integrated photonics on glass: from telecom to sensors
Talk Abstract: Using ion-exchange on glass has been one of the very first technologies that have been used to fabricate integrated photonic devices. It is nowadays a mature platform which is providing commercially available transceivers for Telecommunication applications as well a set of different sensors. In this presentation, we will review the fundamentals and major achievements of glass integrated photonics based on the researches that have been carried-out at the University of Grenoble-Alpes over the last decades. We will hence show how this technology has evolved from the first 1 to 8 power splitter in 1988 to optical amplifiers, narrow linewidth DFB lasers for airborne LIDAR, instrument for astronomy and, last but not least, optofluidic sensors for harsh environment.