Seminarium Optyczne
2006/2007 | 2007/2008 | 2008/2009 | 2009/2010 | 2010/2011 | 2011/2012 | 2012/2013 | 2013/2014 | 2014/2015 | 2015/2016 | 2016/2017 | 2017/2018 | 2018/2019 | 2019/2020 | 2020/2021 | 2021/2022 | 2022/2023 | 2023/2024 | 2024/2025 | Seminarium na YouTube
2025-04-03 (Czwartek)
Zapraszamy do sali 0.06, ul. Pasteura 5 o godzinie 10:15 
Mario Krenn (Max Planck Institute for the Science of Light, Erlangen, Germany)Towards an artificial muse for new ideas in Physics
Artificial intelligence (AI) is a potentially disruptive tool for physics and science in general. One crucial question is how this technology can contribute at a conceptual level to help acquire new scientific understanding or inspire new surprising ideas. I will talk about how AI can be used as an artificial muse in physics, which suggests surprising and unconventional ideas and techniques that the human scientist can interpret, understand and generalize to its fullest potential [1]. I will focus on AI for the design of new physics experiments, in the realm of quantum-optics [2, 3] and quantum-enhanced gravitational wave detectors [4] as well as super-resolution microscopy [5]. Finally I will discuss how algorithms with access to millions of scientific papers can predict and suggest future ideas for scientists [6,7].
[1] Krenn, Pollice, Guo, Aldeghi, Cervera-Lierta, Friederich, Gomes, Häse, Jinich, Nigam, Yao, Aspuru-Guzik, On scientific understanding with artificial intelligence. Nature Reviews Physics 4, 761 (2022).
[2] Krenn, Kottmann, Tischler, Aspuru-Guzik, Conceptual understanding through efficient automated design of quantum optical experiments. Physical Review X 11(3), 031044 (2021).
[3] Ruiz-Gonzalez, Arlt, et al., Digital Discovery of 100 diverse Quantum Experiments with PyTheus, Quantum 7, 1204 (2023).
[4] Krenn, Drori, Adhikari, Digital Discovery of interferometric Gravitational Wave Detectors, in press: Phys. Rev. X (2025), (https://arxiv.org/abs/2312.04258)
[5] Rodríguez, Arlt, Möckl, Krenn, Automated discovery of experimental designs in super-resolution microscopy with XLuminA, Nature Comm. 15, 10658 (2024)
[6] Krenn et al., Forecasting the future of artificial intelligence with machine learning-based link prediction in an exponentially growing knowledge network, Nature Machine Intelligence 5, 1326 (2023)
[7] Gu, Krenn, Interesting Scientific Idea Generation Using Knowledge Graphs and LLMs: Evaluations with 100 Research Group Leaders. arXiv:2405.17044 (2024).
2025-03-27 (Czwartek)
Zapraszamy do sali 0.06, ul. Pasteura 5 o godzinie 10:15
Marco Barbieri (Rome Tre University)Quantum metrology for quantum communications
Quantum metrology is about extracting information from a system. Quantum communications is about sending information over a network. These simple statements reveal a common ground shared by these two applications, but, simply by reading them aloud, one can realise how connecting them is no trivial matter.In this talk we will discuss some recent progress on how concepts and methods from quantum metrology can become beneficial to quantum communications and vice versa. We will present experiments that use photon pairs as means to establish a quantum communication link via their quantum correlations as well as to realise remote quantum sensing. Notably, not only it is possible to use the quality of the sensor to certify the presence of correlations, but also the quality of the correlations can bound the privacy of the sensing.These experiments are first steps towards integrating sensing capabilities in quantum-secure networks, although such a vision necessitates new technical and conceptual tools.
2025-03-20 (Czwartek)
Zapraszamy do sali 0.06, ul. Pasteura 5 o godzinie 10:15
Paweł Szczypkowski (IFD UW)Spatiotemporal light manipulation for nonlinear microscopy
Nonlinear microscopy has revolutionized biological imaging, enabling high-resolution visualization of complex samples. Unlike linear techniques, e.g., multiphoton microscopy offers intrinsic optical sectioning, reduced photodamage, and deeper tissue penetration. However, biological tissues are highly scattering, which fundamentally limits imaging depth and resolution. Overcoming this challenge is crucial for applications ranging from neuroscience to oncology, where clear visualization of deep structures is essential.I will present the three setups for nonlinear imaging: Two-photon microscope that we use for in-vivo imaging, temporal-focusing with super-resolution optical fluctuation imaging for quick and precise imaging, and speckle scanning microscope that together with nonlinearity shows a promise in overcoming the strong scattering.
2025-03-13 (Czwartek)
Zapraszamy do sali 0.06, ul. Pasteura 5 o godzinie 10:15
Agnieszka Siemion (Politechnika Warszawska)THz optics and optical elements
In recent years, the increased research has been conducted in the field of terahertz (THz) optics and imaging. The description that explores the landscape of THz optics, focusing on its achievements, current challenges, and prospects is given in this lecture. THz radiation, characterized by wavelengths considerably longer than visible light, induces substantial diffraction effects, profoundly impacting its behavior and imaging capabilities with optical elements. Moreover, the high coherence exhibited by various THz sources facilitates precise wave manipulation. However, it also introduces unwanted interference effects, which are challenging to suppress. Moreover, in many cases, THz optical systems operate within the near-field diffraction zone, which has its peculiarities.The advancement of THz optics is closely related to exploring various materials and manufacturing techniques. Different materials, ranging from dielectrics to semiconductors, exhibit excellent optical properties in the THz range. Furthermore, innovative manufacturing methods such as lithography, additive manufacturing, and metamaterial engineering play crucial roles in developing novel THz optics.This lecture highlights various achievements, current challenges, and promising avenues in the field of THz optics. Emphasizing its versatile applications and the role of material science and manufacturing innovation underscores the transformative potential of THz technology in shaping future advancements.
2025-03-06 (Czwartek)
Zapraszamy do sali 0.06, ul. Pasteura 5 o godzinie 10:15
Kamil Gradkowski (Tyndall National Institute, Ireland)Photonics packaging and assembly – a grand challenge
Photonic devices are becoming more ubiquitous in our everyday lives. Starting from usage in data- and telecoms, they are now penetrating into biomedical and sensor markets with numerous emerging technologies being actively researched in fields such as quantum computing, space communications, as well as consumer diagnostics or augmented reality systems. As applications become more abundant, the demand for photonic devices grows, outpacing the available manufacturing base. Photonics packaging is an engineering science that turns disparate photonic integrated circuits (PICs) and electronic chips into functional optoelectronic devices. Current packaging methods and processes are insufficient to support the growth of the numerous and often dissimilar markets. The seminar will introduce strategies for supporting the future of photonics, researched and developed in Photonic Packaging Group at Tyndall National Institute in Ireland. These methods target scaling of device manufacturing from the current serial- to the new parallel, high-volume assembly. One of them is a heterogeneous method for integration of a light-source into the PIC which is important of simplification of a system design. Second topic covers a method for a contactless, direct, and pluggable optical interconnect between a fibre network and the photonic device. The final topic targets the automation of packaging processes as well as new substrate materials that enable wafer-scale assembly of photonic devices.
2025-02-27 (Czwartek)
Zapraszamy do sali 0.06, ul. Pasteura 5 o godzinie 10:15
Maks Walewski (IFT UW)Quantum control of ion-atom collisions beyond the ultracold regime
Tunable scattering resonances are crucial for controlling atomic and molecular systems. However, their use has so far been limited to ultracold temperatures. These conditions remain hard to achieve for most hybrid trapped ion-atom systems—a prospective platform for quantum technologies and fundamental research. Here, we measure inelastic collision probabilities for Sr+ + Rb and use them to calibrate a comprehensive theoretical model of ion-atom collisions. Our theoretical results, compared with experimental observations, confirm that quantum interference effects persist to the multiple-partial-wave regime, leading to the pronounced state and mass dependence of the collision rates. Using our model, we go beyond interference and identify a rich spectrum of Feshbach resonances at moderate magnetic fields with the Rb atom in its lower (f = 1) hyperfine state, which persist at temperatures as high as 1 millikelvin. Future observation of these predicted resonances should allow precise control of the short-range dynamics in Sr+ + Rb collisions under unprecedentedly warm conditions.
2025-01-23 (Czwartek)
Zapraszamy do sali 0.06, ul. Pasteura 5 o godzinie 10:15
Piotr Deuar (IF PAN)Scalar field dark matter: a BEC with a galaxy-size wavelength
I will introduce the topic of scalar field dark matter, which is actually quite relevant for lovers of Bose quantum gases and classical wave fields, and then tell a bit about our preliminary investigations with collaborators at Newcastle University into the nonequilibrium dynamics of a dark matter halo.
2025-01-16 (Czwartek)
Zapraszamy do sali 0.06, ul. Pasteura 5 o godzinie 10:15
Emilia Witkowska (IF PAN)Spin chains and squeezing: simple theoretical results
Entanglement in systems with single-particle control is a well-established resource of modern quantum technology. Spin-squeezing is a great example of such. Applied in an optical lattice clock it can reduce the statistical uncertainty of spectroscopic measurements.During the seminar, I will consider the dynamic generation of spin squeezing in spin chains. I will show how anisotropic interactions and inhomogeneous magnetic fields generate scalable spin squeezing when their magnitudes are sufficiently small, but not negligible. The simple models for collective spin will be shown to describe the dynamics effectively. I will also discuss the effect of nonuniform filling caused by hole doping, at a microscopic level, demonstrating their limiting role in the dynamics and scaling.
2024-12-19 (Czwartek)
Zapraszamy do sali 0.06, ul. Pasteura 5 o godzinie 10:15
Joanna Jankowska (Wydział Chemii UW)Unidirectional molecular rotary motor with remotely-switchable rotation direction
Light-driven rotary motors allow direct transformation of light energy into unidirectional rotary motion at the nanoscale, giving rise to countless emerging applications in molecular engineering. The key feature enabling the unidirectional rotation and controlling its direction is the motor chirality, an inherently chemical factor, hard to modify postsynthetically. Here we propose a new molecular rotary motor architecture, E-motor, in which the motor operation direction can be switched in situ, without the need for chemical modification of the system structure. This effect is achieved by application of an external electric-field pulse, and is intended to provide means for chirality control in motors deposited on a surface. Our study relies on quantum-chemical calculations and nonadiabatic molecular dynamics simulations performed for a specifically-tailored system, PFCN, designed to provide illustration for the proposed new motor type. We show that the model system’s chirality and, hence, its operation direction, depends on orientation of a covalently bound polar switching unit, which can be controlled with an external electric field. At the same time, the proposed system manifests all characteristic photophysical properties of a unidirectional molecular motor, and its set chirality is preserved, i.e., it is thermally and optically stable during the regular motor operation in the absence of the electric field.
2024-12-12 (Czwartek)
Zapraszamy do sali 0.06, ul. Pasteura 5 o godzinie 10:15
Piotr Wasylczyk (IFD UW)How to pursue you dreams in the free time at FUW, feel great... and fail
I will present a few projects in biomedical engineering – not necessarily directly optics-related – that used the knowledge and expertise of the FUW Division of Optics and ended with different outcomes.
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