Events: Centre WACQThttp://www.chalmers.se/sv/om-chalmers/kalendariumUpcoming events at Chalmers University of TechnologyMon, 25 Oct 2021 11:23:01 +0200http://www.chalmers.se/sv/om-chalmers/kalendariumhttps://www.chalmers.se/en/research/strong/nano/calendar/Pages/ei_nano_seminar_25_oct.aspxhttps://www.chalmers.se/en/research/strong/nano/calendar/Pages/ei_nano_seminar_25_oct.aspxSmallTalks [about Nanoscience] Magnetic Assay<p>KA, lecture hall, Kemigården 4, Kemi</p><p>​Welcome to a seminar in the series SmallTalks [about Nanoscience] arranged by the Excellence Initiative Nano​. Sobhan Sepehri from VIDEM AB and RISE will talk about Magnetic Assay. The title for the second part of this seminar will be announced soon.  Join from PC, Mac, Linux, iOS or Android: https://chalmers.zoom.us/j/63018620593 ​</p><a href="/SiteCollectionDocuments/SO%20Nano/SmallTalks/Decisiontree_EI_NanoSeminar2021_SC%203.pdf" style="outline:0px"><img src="/SiteCollectionImages/Areas%20of%20Advance/Nano/SmallTalk%20about%20Nanoscience/Decisiontree_EI_NanoSeminar2021_SC%203.jpg" class="chalmersPosition-FloatRight" alt="" style="margin:5px;height:207px;width:150px" />​</a><span style="background-color:initial">In c</span><span style="background-color:initial">ase you are not sure yet, whether you want to attend or not, we have prepared a decision tree that might help you! </span><div><span style="background-color:initial">Click to get a larger picture.</span><div><p class="chalmersElement-P">​</p></div></div>https://www.chalmers.se/en/departments/mc2/calendar/Pages/raam_uzdin.aspxhttps://www.chalmers.se/en/departments/mc2/calendar/Pages/raam_uzdin.aspxNoise, purity, and entanglement measurements using periodic driving<p>online</p><p>​Welcome to a talk by Dr Raam UzdinZoom link: https://chalmers.zoom.us/j/65641799046 Password: 172605</p><strong>​</strong><span style="background-color:initial"><strong>Abstract:</strong></span><div>We present a periodicity-based method to efficiently measure purity loss in quantum circuits. Purity loss allows to quantify the incoherent errors and separate them from coherent error that can be fixed by calibration. If the noise is weak, the methods has no scaling problem. A variant of this method can be used to quantify weak yet highly nonlocal entanglement buildup between two parties. Another variant enables to identify the dissipation hotspots in &quot;weak action&quot; circuits, i.e. when the evolution operator is close to the identity, without checking each gate separately. Finally the same variant can be used to subtract the effect of the noise and retrieve the noise free values of the observables.  Simulation and preliminary results from the IBM quantum processors will be presented. </div> <div><br /></div> <div><br /></div>https://www.chalmers.se/en/centres/wacqt/calendar/Pages/two_stories_in_quantum_gravity.aspxhttps://www.chalmers.se/en/centres/wacqt/calendar/Pages/two_stories_in_quantum_gravity.aspxTwo stories in quantum gravity<p>Kollektorn, lecture room, Kemivägen 9, MC2-huset</p><p>Seminar by Professor Erik Aurell, KTH​</p>​<span style="background-color:initial">Is it necessary to quantize the gravitational field? The analogous question for the electrodynamic field was settled in a famous paper by Bohr and Rosenfeld, now almost 90 years ago. The answer is yes, as otherwise there would be a a way to bypass the Heisenberg uncertainty relations for a body obeying quantum mechanics and interacting with the field.</span><div>The gravitational question has been discussed for a long time, with opposite opinions appearing in the literature until very recently. I will discuss that one class of recently proposed Gedankenexperiments do not settle the issue, as a putative paradox (to be described in the talk) can be resolved by the simpler assumption that length scales below the Planck length can not be resolved. That the Gedankenexperiemnt does not imply quantization of the gravitational field of course does not imply the opposite, i.e. that gravitation is not quantized (i). It could also be that that the gravitational field is quantized anyway (ii), or that gravitation is somehow quantized, but is not as a quantum field theory (iii).</div> <div>In the second part of the talk I will discuss an idea related to option (iii), motivated by Hawking’s paper ”Information Preservation and Weather Forecasting for Black Holes” (2014).</div> <div><br /></div> <div>The talk is based on joint work with Erik Rydving and Igor Pikovski [first part, arXiv:2107.07514] and Michal Eckstein and Pawel Horodecki [second part, Foundations of Physics 51 (2), 1-13 (2021)].</div> <div><br /></div>https://www.chalmers.se/en/departments/mc2/calendar/Pages/sjaak_van_diepen.aspxhttps://www.chalmers.se/en/departments/mc2/calendar/Pages/sjaak_van_diepen.aspxSpin chain with electrons in quantum dots<p>online</p><p>​Welcome to a talk by Dr Sjaak van Diepen Zoom link: https://chalmers.zoom.us/meeting/68181256738 Password:318385</p><strong></strong>​<span style="background-color:initial"><strong>Abstract</strong>:</span><div>Magnetic behaviour, caused by the underlying ordering of spins, can take intricate forms when interactions result in quantum-mechanical correlations. Analog quantum simulators, which behave like the system of interest, can possibly provide insights into such behaviour. Gate-defined quantum dots, in addition to being of interest for quantum computation, have potential for quantum simulation of magnetism. We operate a linear array of four quantum dots in a GaAs/AlGaAs heterostructure. The quantum dots are tuned to the half-filling regime, where each site is occupied with a single electron. In this regime only the spin degree of freedom remains, and a Heisenberg spin chain can be formed. We extract various properties of the spin chain based on pairwise spin measurements and correlations therein. First, we study the energy spectrum as a function of gate voltages and an external magnetic field. Then, we quantitatively characterize the ground state for a homogeneously interacting spin chain. Last, we observe collective coherent oscillations of the four-spin system in subspaces with different magnetization. Building on the demonstrated control and characterization techniques, interesting next steps are to simulate magnetism with a larger number of spins and in different lattice configurations.</div> <div><br /></div> https://www.chalmers.se/en/research/strong/nano/calendar/Pages/ei_nano_seminar_8_nov.aspxhttps://www.chalmers.se/en/research/strong/nano/calendar/Pages/ei_nano_seminar_8_nov.aspxSmallTalks [about Nanoscience] Lipid nanoparticles for delivery of mRNA<p>TBD</p><p>​Welcome to a seminar in the series SmallTalks [about Nanoscience] arranged by the Excellence Initiative Nano​. Michael Munson, Postdoctoral Fellow at AstraZeneca R&amp;D, affiliated to FoRmulaEx will talk about Lipid nanoparticles for delivery of mRNA. The title for the second part of this seminar will be announced soon.  Join from PC, Mac, Linux, iOS or Android: https://chalmers.zoom.us/j/63018620593 ​​</p><a href="/SiteCollectionDocuments/SO%20Nano/SmallTalks/Decisiontree_EI_NanoSeminar2021_SC%203.pdf" style="outline:currentcolor none 0px"><img src="/SiteCollectionImages/Areas%20of%20Advance/Nano/SmallTalk%20about%20Nanoscience/Decisiontree_EI_NanoSeminar2021_SC%203.jpg" class="chalmersPosition-FloatRight" alt="" style="margin:5px;height:207px;width:150px" />​</a><span style="background-color:initial">In c</span><span style="background-color:initial">ase you are not sure yet, whether you want to attend or not, we have prepared a decision tree that might help you! </span><div><span style="background-color:initial">Click to get a larger picture.</span><a href="/SiteCollectionDocuments/SO%20Nano/SmallTalks/Decisiontree_EI_NanoSeminar2021_SC%203.pdf">​</a><div><p class="chalmersElement-P"><br />​</p></div></div>https://www.chalmers.se/en/centres/wacqt/calendar/Pages/Giant-atoms-–-a-new-frontier-in-quantum-optics.aspxhttps://www.chalmers.se/en/centres/wacqt/calendar/Pages/Giant-atoms-%E2%80%93-a-new-frontier-in-quantum-optics.aspxGiant atoms – a new frontier in quantum optics<p>PJ, seminar room, Kemigården 1, Fysik Origo</p><p>Theoretical Physics Seminar with Anton Frisk Kockum.This is part of a seminar series for students and researchers interested in theoretical physics and applied mathematics arranged by GU. ​</p>​When studying the interaction between light and matter at the quantum level, it is common to apply the dipole approximation, where atoms are assumed small compared to the wavelength of the light. However, recent experiments with superconducting qubits coupled to surface acoustic waves or microwave transmission lines have shown that it is possible to realize ”giant atoms”, i.e., atoms that couple to light (or sound) at multiple points that are wavelengths apart. In this talk, I will present an overview of theoretical and experimental work on such giant atoms. In particular, I will explain how multiple giant atoms can interact via a waveguide while remaining protected from relaxation into the waveguide, and show experimental data demonstrating this protected interaction.https://www.chalmers.se/en/areas-of-advance/ict/calendar/Pages/Act-Sustainable-Can-automated-fact-checkers-clean-up-the-mess.aspxhttps://www.chalmers.se/en/areas-of-advance/ict/calendar/Pages/Act-Sustainable-Can-automated-fact-checkers-clean-up-the-mess.aspxAct Sustainable: Can automated fact checkers clean up the mess?<p>Studenternas Hus, Götabergsgatan 17, Göteborg</p><p>​Five days dedicated to sustainable development! The Act Sustainable week is soon up and running, starting 15th of November. Chalmers, represented by the Information and Communications Area of Advance, invites you to a morning session with focus on automated fact-checking.</p>​<div><div>The dream of free dissemination of knowledge seems to be stranded in a swamp of tangled truth. Fake news proliferates. Digital echo chambers confirm biases. It even seems hard to agree upon basic facts. Is there hope in the battle to clean up this mess? Yes! Within the research area of information and communications technology, we try to find ways through software solutions.</div> <div><br /></div> <div>In this morning session, you will meet with two invited researchers, both developing automated fact-checking methods. The talks are followed up with a panel discussion, bringing a broader perspective on the problem. The panelists are guests from Chalmers and the University of Gothenburg, together with the keynote speakers.</div> <div><br /></div></div> <div><b><br /></b></div> <div> <div><b>Agenda:</b></div> <div>09:45 <b>Introduction</b> by <b>Erik Ström</b>, Director, Information and Communications Technology Area of Advance</div> <div>10:00 <b>Looking for the truth in the post-truth era</b> with <b>Ivan Koychev</b>, University of Sofia, Bulgaria</div> <div>10:30 <b>Computational Fact-Checking for Textual Claims</b> with <b>Paolo Papotti</b>, Associate Professor, EURECOM, France</div> <div>11:00 <b>Pause</b></div> <div>11:10 <b>Panel discussion</b>, moderator <b>Graham Kemp</b>, professor, Department of Computer Science and Engineering, Chalmers and researchers from ChalmersUniversity of Technology and the University of Gothenburg.</div> <div>12:00 <b>The end</b></div> <div><br /></div> <div><a href="https://www.actsustainable.se/thursday21" target="_blank" title="link to Act Sustainable website"><img class="ms-asset-icon ms-rtePosition-4" src="/_layouts/images/icgen.gif" alt="" />Read more and register here</a>​</div> <div><br /></div> <div><br /></div> <div><br /></div></div>https://www.chalmers.se/en/research/strong/nano/calendar/Pages/ei_nano_seminar_22_nov.aspxhttps://www.chalmers.se/en/research/strong/nano/calendar/Pages/ei_nano_seminar_22_nov.aspxSmallTalks [about Nanoscience] RNA and Fluorescence<p>tbd</p><p>​Welcome to a seminar in the series SmallTalks [about Nanoscience] arranged by the Excellence Initiative Nano​. Jesper Nilsson from Chemistry and Biochemistry Lab and FoRmulaEx, Department of Chemistry will talk about RNA and Fluorescence. The title for the second part of this seminar will be announced soon.  Join from PC, Mac, Linux, iOS or Android: https://chalmers.zoom.us/j/63018620593</p><a href="/SiteCollectionDocuments/SO%20Nano/SmallTalks/Decisiontree_EI_NanoSeminar2021_SC%203.pdf" style="outline:currentcolor none 0px"><img src="/SiteCollectionImages/Areas%20of%20Advance/Nano/SmallTalk%20about%20Nanoscience/Decisiontree_EI_NanoSeminar2021_SC%203.jpg" class="chalmersPosition-FloatRight" alt="" style="margin:5px;height:207px;width:150px" />​</a><span style="background-color:initial">In c</span><span style="background-color:initial">ase you are not sure yet, whether you want to attend or not, we have prepared a decision tree that might help you! </span><div><span style="background-color:initial">Click to get a larger picture.</span><a href="/SiteCollectionDocuments/SO%20Nano/SmallTalks/Decisiontree_EI_NanoSeminar2021_SC%203.pdf">​</a><div><p class="chalmersElement-P"><br />​​</p></div></div> https://www.chalmers.se/en/research/strong/nano/calendar/Pages/ei_nano_seminar_6_dec.aspxhttps://www.chalmers.se/en/research/strong/nano/calendar/Pages/ei_nano_seminar_6_dec.aspxSmallTalks [about Nanoscience] Quantum Thermodynamics<p>tbd</p><p>​Welcome to a seminar in the series SmallTalks [about Nanoscience] arranged by the Excellence Initiative Nano​. Juliette Monsel from Applied quantum physics Lab, Department for Microtechnology and Nanoscience will talk about Quantum Thermodynamics. The title for the second part of this seminar will be announced soon.  Join from PC, Mac, Linux, iOS or Android: https://chalmers.zoom.us/j/63018620593 ​</p><a href="/SiteCollectionDocuments/SO%20Nano/SmallTalks/Decisiontree_EI_NanoSeminar2021_SC%203.pdf" style="outline:0px"><img src="/SiteCollectionImages/Areas%20of%20Advance/Nano/SmallTalk%20about%20Nanoscience/Decisiontree_EI_NanoSeminar2021_SC%203.jpg" class="chalmersPosition-FloatRight" alt="" style="margin:5px;height:207px;width:150px" />​</a><span style="background-color:initial">In c</span><span style="background-color:initial">ase you are not sure yet, whether you want to attend or not, we have prepared a decision tree that might help you! </span><div><span style="background-color:initial">Click to get a larger picture.</span><a href="/SiteCollectionDocuments/SO%20Nano/SmallTalks/Decisiontree_EI_NanoSeminar2021_SC%203.pdf">​</a><div><p class="chalmersElement-P"><br />​​</p></div></div>