Sebastian Deffner @quthermo.bsky.social · 23/09/2026physics.umbc.edu/home/news/po...physics.umbc.eduFrom Langenberg Award to Journal Publication: Gregory Behrendt's Research on Heat Engine EfficiencyEvery undergraduate student has learned that the maximal efficiency any heat engine can achieve is given by the Carnot efficiency, which describes the Carnot cycle and which is independent of the work... 000
Sebastian Deffner @quthermo.bsky.social · 20/09/2026New paper with Greg Behrendt: www.mdpi.com/1099-4300/28...mdpi.com 000
Sebastian Deffner @quthermo.bsky.social · 18/09/2026New preprint: arxiv.org/abs/2609.20757arxiv.orgProcrastinating einselection in non-Markovian quantum dynamicsAmong the processes governed by open-system and dissipative quantum dynamics, environment-induced superselection, or einselection, is particularly foundational, since it describes the formation of a p... 010
Sebastian Deffner @quthermo.bsky.social · 13/08/2026A little while ago, I asked a question to which I thought I really should now the answer....but I didn't. Given a particular heat engine cycle, what is the optimal working medium that gives the highest efficiency? New preprint by Gregory Behrendt with the answer: arxiv.org/abs/2608.11966arxiv.orgIdeal heat engine cycles at maximal efficiency -- the ideal gas and beyondGiven a particular heat engine cycle, what is the optimal working medium that results in the highest efficiency? While one might jump to the conclusion that it must surely be the ideal gas, the situat... 010
Sebastian Deffner @quthermo.bsky.social · 10/08/2026physicstoday.aip.org/features/the...physicstoday.aip.orgThe decline in physics bachelor’s degrees: Contributors and consequencesAs higher-education programs compete for a shrinking pool of students, departments must better communicate the value that a physics major brings. 021
Sebastian Deffner @quthermo.bsky.social · 16/07/2026iopscience.iop.org/article/10.1...iopscience.iop.orgFrom compatibility of measurements to exploring quantum Darwinism on NISQFrom compatibility of measurements to exploring quantum Darwinism on NISQ, Doucet, Emery, Deffner, Sebastian 000
Sebastian Deffner @quthermo.bsky.social · 10/07/2026New preprint: arxiv.org/abs/2607.07988arxiv.orgProcrustes Tomography -- reconstructing noisy quantum channels made easyWhat is the most expensive part of quantum device characterization? Clearly, the answer is quantum process tomography. However, especially for noisy intermediate-scale quantum (NISQ) computers, a comp... 001
Sebastian Deffner @quthermo.bsky.social · 27/05/2026New paper in New Journal of Physics @ioppublishing.bsky.social @iopp-quantum.bsky.social: We show that the precise way you code your quantum algorithm for quantum annealers can have tremendous thermodynamic consequences. With @reecejrobertson.bsky.social iopscience.iop.org/article/10.1...iopscience.iop.orgThermodynamic significance of QUBO encoding on quantum annealersThermodynamic significance of QUBO encoding on quantum annealers, Doucet, Emery, Mzaouali, Zakaria, Robertson, Reece, Gardas, Bartłomiej, Deffner, Sebastian, Domino, Krzysztof 031
Sebastian Deffner @quthermo.bsky.social · 22/05/2026Congratulations to Maggie Williams for receiving her Master of Science in Physics from UMBC!! And as perfect timing goes, here is also her first published paper now available in Journal of Nonequilibrium Thermodynamics: www.degruyterbrill.com/document/doi...degruyterbrill.com 030
Sebastian Deffner @quthermo.bsky.social · 11/05/2026Last chance to sign up for "Natural and Engineered Complex Quantum Systems Workshop at UMBC" forms.gle/qrNbVKFjsUGb...forms.gleRegistration: Natural and Engineered Complex Quantum Systems Workshop at UMBCRegistration for the workshop held at UMBC on May 26th and 27th 2026 020
Reposted by Sebastian DeffnerEPL (Europhysics Letters) @epljournal.bsky.social · 07/05/2026EPL celebrates its 40th anniversary! 🎉 To celebrate, we launch a series of 40th Anniversary Highlights, written by our Editor-in-Chief Dr Richard Blythe and our three Deputy Editors, and revisiting key papers published in EPL. 121
Sebastian Deffner @quthermo.bsky.social · 07/05/2026Implementing quantum error correction is generally expected to be absolutely crucial in achieving fault tolerance. However, bigger is not always better! And the specific implementation matters a lot! @joseystevens.bsky.social exploring the energy-error tradeoff: arxiv.org/abs/2605.04329arxiv.orgEnergy-error tradeoff in encoding quantum error correctionWhile it has been widely recognized that genuine quantum advantage for practical problems might only be achieved with fault-tolerant quantum computers, it is still not entirely clear whether the requi... 120
Reposted by Sebastian DeffnerAPS DSNP @aps-dsnp.bsky.social · 07/05/2026📌 We are thrilled to host Sidney Redner (Santa Fe Institute) for our next klogW seminar on May 12 at 12PM EST on "First-Passage Processes with Applications to Resetting-Driven Optimization, Wealth Sharing, and Forest Fires" 🔥 Register here: engage.aps.org/dsnp/resourc... 011
Sebastian Deffner @quthermo.bsky.social · 30/04/2026New preprint celebrating Amir O. Caldeira's contributions to the understanding of Quantum Brownian Motion: arxiv.org/abs/2604.26524arxiv.orgOver forty years of research towards the understanding of Quantum Brownian Motion -- the contributions of A. O. CaldeiraThis article presents a brief account of Amir O. Caldeira's contributions to the theory of quantum Brownian motion. Motivated by its importance, we outline the description of Brownian motion in the qu... 010
Sebastian Deffner @quthermo.bsky.social · 28/04/2026New preprint: Quantum speed limit for measurement probabilities arxiv.org/abs/2604.23160arxiv.orgQuantum speed limit for measurement probabilitiesAny protocol to process quantum information has to conclude with a measurement, aimed at producing a specific set of probabilities of measurement outcomes. In this work, we investigate the time, energ... 110
Reposted by Sebastian DeffnerKatie Mack @astrokatie.com · 23/04/2026When Einstein developed general relativity the closest thing to a practical application that could even be imagined at the time was a slightly more precise description of where to look for the planet Mercury in the sky, and yet now we’d all be literally lost without it. Anyway: fund basic research. 5362851670
Sebastian Deffner @quthermo.bsky.social · 23/04/2026Undergrad researcher Monty presenting his project on solving PDEs on NISQ advised by @reecejrobertson.bsky.social @umbc.edu 010
Sebastian Deffner @quthermo.bsky.social · 22/04/2026New paper: Quantum speed limit for observables from quantum asymmetry @physreva.bsky.social journals.aps.org/pra/abstract...journals.aps.orgQuantum speed limit for observables from quantum asymmetryQuantum asymmetry and coherence are genuinely quantum resources that are essential to realize quantum advantage in information technologies. However, all quantum processes are fundamentally constraine... 010
Reposted by Sebastian DeffnerAPS DSNP @aps-dsnp.bsky.social · 17/04/2026📣 We’re kicking off the first klogW seminar of the year! Join us on April 21st at 12PM EST for a talk by Douglas Jerolmack (UPenn) — 2026 APS-DSNP Fellow — presenting "Fragility of Soft Earth Materials" 🌎🌍🌏 Registration link: apsphysics.zoom.us/webinar/regi... 011
Sebastian Deffner @quthermo.bsky.social · 08/04/2026New paper in @physreve.bsky.social: Quantum thermodynamics of Gross-Pitaevskii qubits journals.aps.org/pre/abstract...journals.aps.orgQuantum thermodynamics of Gross-Pitaevskii qubitsWhat are the resources that can be leveraged for a thermodynamic device to exhibit genuine quantum advantage? Typically, the answer to this question is sought in quantum correlations. In the present w... 020
Sebastian Deffner @quthermo.bsky.social · 08/04/2026Congrats to QSI Graduate Fellow @reecejrobertson.bsky.social for winning UMBC's 3MT competition today! Next stop, Regionals! gears.umbc.edu/3mt/ 011
Reposted by Sebastian DeffnerAPS DSNP @aps-dsnp.bsky.social · 26/03/2026📣 DSNP Early-Career Spotlight: Megan Engel from University of Calgary! Her research focuses on molecular motors' efficiency—and how to apply these principles to bio-nanotechnology. Check out the interview below! Want to suggest who to feature next? Email us at gsnpsocialmedia@gmail.com 122
Reposted by Sebastian DeffnerAPS DSNP @aps-dsnp.bsky.social · 16/03/2026📣 After a fantastic Squishy Sunday event, the APS Global Physics Summit 2026 has officially started! Check out the DSNP session schedule below. Come say hi at the DSNP table and get your members-only T-shirt! #APSSummit2026 #GlobalPhysicsSummit #DSNP #StatisticalPhysics #NonlinearPhysics #APS 011
Reposted by Sebastian DeffnerAPS DSNP @aps-dsnp.bsky.social · 14/03/2026🎉 30 years of Statistical & Nonlinear Physics — and we're just getting started! To mark the transition from APS G to D, @physreve.bsky.social have highlighted the most influential papers that drew the map of the field. 📖 journals.aps.org/over-30-years #StatisticalPhysics #DSNP #Physicsjournals.aps.orgOver 30 years of Statistical and Nonlinear Physics in _Physical Review E_APS Division of Statistical and Nonlinear Physics and <em>Physical Review E</em> review over 30 years of research in the division’s areas. 022
Reposted by Sebastian DeffnerAPS DSNP @aps-dsnp.bsky.social · 13/03/2026Excited for #APSSummit26? We are too! Come join us, we’re looking for volunteers! @apsphysics.bsky.social #StatsPhys #NonlinearPhys Details 👇 122
Reposted by Sebastian DeffnerAPS DSNP @aps-dsnp.bsky.social · 12/03/2026We’re delighted to share a new editorial in @physreve.bsky.social (PRE) on the DSNP Dissertation Award in #Statistical & #Nonlinear Physics, marking the inaugural year of PRE sponsorship. Congratulations to the winner, 𝐉𝐨𝐧𝐚𝐬 𝐕𝐞𝐞𝐧𝐬𝐭𝐫𝐚, from UvA 🎉 Read more: journals.aps.org/pre/abstract...journals.aps.orgEditorial: DSNP Dissertation Award 2025 -- Pushing the limits of active metamaterialsThe DSNP Dissertation Award Selection Committee presents the 2025 Award sponsored by Physical Review E. 031
Sebastian Deffner @quthermo.bsky.social · 12/03/2026At the upcoming Global Physics Summit in Denver, @aps-dsnp.bsky.social will be celebrating our advancement from Topical Group to Division! To kick the party off, here is a collection of highlights published in @physreve.bsky.social: journals.aps.org/over-30-yearsjournals.aps.orgOver 30 years of Statistical and Nonlinear Physics in _Physical Review E_APS Division of Statistical and Nonlinear Physics and <em>Physical Review E</em> review over 30 years of research in the division’s areas. 031
Reposted by Sebastian DeffnerThe Hilbert Space Post @hilbertspacepost.bsky.social · 05/03/2026A variational quantum algorithm is implemented on IonQ hardware to prepare Gibbs states of the transverse-field Ising model, with fidelities evaluated via state tomography. @reecejrobertson.bsky.social, @quthermo.bsky.social arxiv.org/abs/2603.03801arxiv.orgVariational Gibbs State Preparation on Trapped-Ion DevicesWe implement a variational quantum algorithm for Gibbs state preparation of a transverse-field Ising model on IonQ's quantum computers. To this end, we train the variational parameters via classical s... 122
Sebastian Deffner @quthermo.bsky.social · 05/03/2026What are NISQ computers good for? Well, possibly many things. But definitely for the preparation of Gibbs states: arxiv.org/abs/2603.03801arxiv.orgVariational Gibbs State Preparation on Trapped-Ion DevicesWe implement a variational quantum algorithm for Gibbs state preparation of a transverse-field Ising model on IonQ's quantum computers. To this end, we train the variational parameters via classical s... 121
Reposted by Sebastian DeffnerJake Xuereb @curlyqubit.bsky.social · 04/03/2026The Qalypso School on Quantum Science in Malta returns for its 3rd edition Aug 31 - Sep 4 this year! 🏖️ We have a great line up of lecturers covering Quantum Optimisation, Quantum Thermodynamics and Quantum Gibbs Sampling. Pre-registrations opens today at forms.gle/3NkMJ3Br9V8b... Do Share! 0199
Sebastian Deffner @quthermo.bsky.social · 30/01/2026The amazing Prof. Nakalembe taking the TED stage: www.ted.com/talks/cather...ted.comWhy can't we better prepare for extreme weather?Thanks to advanced technology, we can now see droughts and crop failures months before they hit. So why are millions of people still going hungry? TED Fellow Catherine Nakalembe, director of the NASA ... 000
Reposted by Sebastian DeffnerReece Robertson @reecejrobertson.bsky.social · 29/01/2026New paper on #QuantumComputing emulation just posted to @ieeexplore.bsky.social! I was thrilled to share this work at the @ieeeorg.bsky.social #CASCON2025 conference last November. The project @github.com was awarded an IEEE Research Object Reviewed Badge. ieeexplore.ieee.org/document/113...ieeexplore.ieee.orgIntroducing UNIQuE: The Unconventional Noiseless Intermediate Quantum EmulatorWe implement an open-source quantum computing emulator that includes arithmetic operations, the quantum Fourier transform, and quantum phase estimation. The emulator provides significant savings in bo... 043
Sebastian Deffner @quthermo.bsky.social · 17/01/2026journals.aps.org/pra/abstract...journals.aps.orgQuantum speed limit for the out-of-time-ordered correlator from an open-system perspectiveA quantum speed limit for the decay of out-of-time-ordered correlators is established by interpreting information scrambling in a closed quantum system as effective decoherence, relating the scramblin... 031
Sebastian Deffner @quthermo.bsky.social · 12/01/2026New preprint: employing NISQ to verify the tenets of Quantum Darwinism arxiv.org/abs/2601.05350arxiv.orgFrom compatibility of measurements to exploring Quantum Darwinism on NISQQuantum Darwinism explains how tenets of classical reality, such as objectivity and repeatability, emerge within a quantum universe. As a mathematical framework, Quantum Darwinism also provides guidin... 030
Sebastian Deffner @quthermo.bsky.social · 09/01/2026Does it matter thermodynamically how to code your algorithm? On quantum annealers it matters a lot: arxiv.org/abs/2601.04402arxiv.orgThermodynamic significance of QUBO encoding on quantum annealersQuadratic unconstrained binary optimization (QUBO) is the standard interface to quantum annealers, yet a single constrained task admits many QUBO encodings whose penalty choices reshape the energy lan... 020
Reposted by Sebastian DeffnerJens Eisert @jenseisert.bsky.social · 09/01/2026To what extent can noisy quantum circuits be classically simulated? And at what point is this no longer true, so that one can hope for a quantum advantage? This is a compelling research question. Here, we suggest frames to do so, extending known Monte Carlo methods. scirate.com/arxiv/2601.0... 082
Reposted by Sebastian DeffnerJens Eisert @jenseisert.bsky.social · 05/01/2026Do Bose-Hubbard type systems have a speed of sound for particle propagation? scirate.com/arxiv/2601.001… Yes. This work proves a strikingly simple bound of this kind for particle propagation for generalized Bose–Hubbard models defined on general lattices. 182
Sebastian Deffner @quthermo.bsky.social · 02/01/2026Happy 40th Birthday @epljournal.bsky.social iopscience.iop.org/article/10.1...iopscience.iop.orgRadware Bot Manager CaptchaTo ensure we keep this website safe, please can you confirm you are a human by ticking the box below. 010
Sebastian Deffner @quthermo.bsky.social · 13/12/2025Fluctuation theorems for autonomous work | PNAS www.pnas.org/doi/10.1073/...pnas.orgFluctuation theorems for autonomous work | PNASClassical fluctuation theorems for work have been obtained theoretically, and verified experimentally, within a nonautonomous framework in which wo... 040
Reposted by Sebastian Deffnerdavidasivak.bsky.social @davidasivak.bsky.social · 05/12/2025We’re hiring! The Department of Physics @sfuphysics.bsky.social at Simon Fraser U (in beautiful and vibrant Vancouver) seeks applications for an Assistant or Associate Professor in Experimental Biophysics, encompassing all scales of life from molecules to ecosystems. @sfuscience.bsky.social 1159
Sebastian Deffner @quthermo.bsky.social · 26/11/2025Do you wonder what Shortcuts to Adiabaticity are really good for? How about correcting quantum gate errors? New publication in @epljournal.bsky.social iopscience.iop.org/article/10.1...iopscience.iop.orgRadware Bot Manager CaptchaTo ensure we keep this website safe, please can you confirm you are a human by ticking the box below. 071
Sebastian Deffner @quthermo.bsky.social · 20/11/2025Have you ever wondered if Maxwell's demon could get dementia? And if so, how would you model it? Wonder no further! Here is the very first manuscript of my grad student Maggie Williams together with Emery Doucet. arxiv.org/abs/2511.15691arxiv.orgDemon with dementia - the deterioration of information transcriptionIn introductory biology, aging is typically explained as a result of mutations during the DNA replication process within cells. Upon abstraction, we recognize that cellular aging can be understood as ... 060
Reposted by Sebastian DeffnerThe Washington Post @washingtonpost.com · 18/11/2025The Trump administration’s crackdown on legal immigration is making it tougher for doctors, engineers, professors and artists to get permission to work and live in the U.S. For foreign professionals, the crackdown has meant new levels of anguish and fear. washingtonpost.comTrump’s immigration crackdown is keeping foreign professionals outFederal authorities are denying more work visas and green cards, vetting social media posts and applying enhanced scrutiny to foreign employees’ credentials. 85623
Reposted by Sebastian DeffnerAlison Banwell @alibanwell.bsky.social · 02/11/2025Yup! 75% of us are considering leaving (/made plans to leave/already left) 😢 🧪 www.pbs.org/newshour/sho...pbs.orgTop researchers consider leaving U.S. amid funding cuts: 'The science world is ending'A poll from the journal Nature found that 75% of researchers in the U.S. are considering leaving the country. That includes a man who’s been dubbed the "Mozart of Math." Stephanie Sy examines what’s b... 1618662
Sebastian Deffner @quthermo.bsky.social · 28/10/2025Quantum Science Institute @umbc.bsky.social representation at the Quantum Leap Career Nexus! 020
Reposted by Sebastian DeffnerJens Eisert @jenseisert.bsky.social · 22/10/2025This is a manuscript I am particularly happy with. It concerns topics I have been working on for my PhD, entanglement theory, going back to the work of Bennett et al. Yet it still has a fresh flavour, relating the subject to modern developments in quantum computing. www.nature.com/articles/s41... 0172
Sebastian Deffner @quthermo.bsky.social · 21/10/2025Train scheduling goes quantum feat. Dr. Emery Doucet and Reece Robertson: www.youtube.com/watch?v=xWKR... www.nature.com/articles/s41...youtube.comQuantum on Track: Quantum Computing for Urban Train SchedulingYouTube video by UMBCtube 000
Sebastian Deffner @quthermo.bsky.social · 21/10/2025Do you want to do a postdoc with me? 10 days left to apply! apply.interfolio.com/172719apply.interfolio.com Apply - Interfolio {{$ctrl.$state.data.pageTitle}} - Apply - Interfolio 000