QuIT Physics
@quitphysics.info
Theory division of TU Wien's Atominstitut, encompassing groups for Quantum Info, Thermo, Foundations, Computing, Optics, Many-Body physics and more! We like open, diverse science + good coffee! Account run by @tomrivlin.com
https://www.quitphysics.info/
https://www.quitphysics.info/
November 11, 2025 at 8:34 AM
New preprint! Eliza and colleagues demonstrate how a quasiprobability representation of a measurement is altered when said measurement is over- or undercomplete, including in scenarios with noise. This has implications for which states can be called 'classical'
arxiv.org/abs/2511.04274
arxiv.org/abs/2511.04274
November 10, 2025 at 10:27 AM
New preprint! Eliza and colleagues demonstrate how a quasiprobability representation of a measurement is altered when said measurement is over- or undercomplete, including in scenarios with noise. This has implications for which states can be called 'classical'
arxiv.org/abs/2511.04274
arxiv.org/abs/2511.04274
Two new arXiv postings by Shuheng today! Both on the subject of using Wigner functions to detect genuine multipartite entanglement (GME). The first preprint shows that if you have "enough" negativity in your Wigner function, that certifies that you have GME arxiv.org/abs/2510.26761
October 31, 2025 at 10:37 AM
Two new arXiv postings by Shuheng today! Both on the subject of using Wigner functions to detect genuine multipartite entanglement (GME). The first preprint shows that if you have "enough" negativity in your Wigner function, that certifies that you have GME arxiv.org/abs/2510.26761
Reposted by QuIT Physics
In our new paper arxiv.org/abs/2510.15693, EntaQCT www.quitphysics.info/entaqct team member Ida Mishra and myself on the side of @tuwien.at had the pleasure of collaborating with the team of Ben Lanyon at the @uniinnsbruck.bsky.social 4/8
Generation of multipartite photonic entanglement using a trapped-ion quantum processing node
The ability to establish entanglement between the nodes of future quantum networks is essential for enabling a wide range of new applications in science and technology. A promising approach involves t...
arxiv.org
October 24, 2025 at 7:40 AM
In our new paper arxiv.org/abs/2510.15693, EntaQCT www.quitphysics.info/entaqct team member Ida Mishra and myself on the side of @tuwien.at had the pleasure of collaborating with the team of Ben Lanyon at the @uniinnsbruck.bsky.social 4/8
Reposted by QuIT Physics
Quantum networks might one day enable more secure options for communication and distributed computation and are therefore currently a hot research topic, one which presents many challenges: One is the on-demand distribution of quantum systems that feature genuine multipartite entanglement (GME). 1/8
October 24, 2025 at 7:40 AM
Quantum networks might one day enable more secure options for communication and distributed computation and are therefore currently a hot research topic, one which presents many challenges: One is the on-demand distribution of quantum systems that feature genuine multipartite entanglement (GME). 1/8
New preprint! Ida and Nico join a team of experimentalists working on new ways to produce genuinely multipartite entanglement in photons using a trapped-ion quantum processor
arxiv.org/abs/2510.15693
arxiv.org/abs/2510.15693
Generation of multipartite photonic entanglement using a trapped-ion quantum processing node
The ability to establish entanglement between the nodes of future quantum networks is essential for enabling a wide range of new applications in science and technology. A promising approach involves t...
arxiv.org
October 20, 2025 at 11:55 AM
New preprint! Ida and Nico join a team of experimentalists working on new ways to produce genuinely multipartite entanglement in photons using a trapped-ion quantum processor
arxiv.org/abs/2510.15693
arxiv.org/abs/2510.15693
Congrats to Phila for being the DPG "Physikerin der Woche" this week! www.dpg-physik.de/vereinigunge...
October 17, 2025 at 11:33 AM
Congrats to Phila for being the DPG "Physikerin der Woche" this week! www.dpg-physik.de/vereinigunge...
New preprint from Nico. A pretty cool theoretical result demonstrated experimentally: genuine multipartite entanglement activation from two copies of a biseparable three-qubit state
arxiv.org/abs/2510.12457
arxiv.org/abs/2510.12457
Experimental verification of multi-copy activation of genuine multipartite entanglement
A central concept in quantum information processing is genuine multipartite entanglement (GME), a type of correlation beyond biseparability, that is, correlations that cannot be explained by statistic...
arxiv.org
October 15, 2025 at 11:20 AM
New preprint from Nico. A pretty cool theoretical result demonstrated experimentally: genuine multipartite entanglement activation from two copies of a biseparable three-qubit state
arxiv.org/abs/2510.12457
arxiv.org/abs/2510.12457
Congrats to the three new physics Nobel laureates, who helped lay the groundwork for superconducting quantum computing. As always, nobelprize.org has a great technical summary of the results that won the prize and the wider research context
www.nobelprize.org/prizes/physi...
www.nobelprize.org/prizes/physi...
Nobel Prize in Physics 2025
The Nobel Prize in Physics 2025 was awarded to John Clarke, Michel H. Devoret and John M. Martinis “for the discovery of macroscopic quantum mechanical tunnelling and energy quantisation in an electri...
www.nobelprize.org
October 7, 2025 at 10:14 AM
Congrats to the three new physics Nobel laureates, who helped lay the groundwork for superconducting quantum computing. As always, nobelprize.org has a great technical summary of the results that won the prize and the wider research context
www.nobelprize.org/prizes/physi...
www.nobelprize.org/prizes/physi...
Reposted by QuIT Physics
Amazing to see the work of @itsmealeale.bsky.social and Partyk L Bartosik highlighted like this.
Having followed it as it was written and knowing the hard work that was poured into it, really brings a smile to one's face to see it highlighted.
Yes to detecting entanglement using thermodynamics!
Having followed it as it was written and knowing the hard work that was poured into it, really brings a smile to one's face to see it highlighted.
Yes to detecting entanglement using thermodynamics!
A Thermometer for Measuring Quantumness | Quanta Magazine
“Anomalous” heat flow, which at first appears to violate the second law of thermodynamics, gives physicists a way to detect quantum entanglement without destroying it.
www.quantamagazine.org
October 1, 2025 at 3:00 PM
Amazing to see the work of @itsmealeale.bsky.social and Partyk L Bartosik highlighted like this.
Having followed it as it was written and knowing the hard work that was poured into it, really brings a smile to one's face to see it highlighted.
Yes to detecting entanglement using thermodynamics!
Having followed it as it was written and knowing the hard work that was poured into it, really brings a smile to one's face to see it highlighted.
Yes to detecting entanglement using thermodynamics!
Yet another new preprint from Philipp this week! Here, he and his colleagues introduce a full quantum model for bright squeezed vacuum pulses on femtosecond timescales in strongly light-driven nonlinear media
arxiv.org/abs/2509.19608
arxiv.org/abs/2509.19608
September 26, 2025 at 9:20 AM
Yet another new preprint from Philipp this week! Here, he and his colleagues introduce a full quantum model for bright squeezed vacuum pulses on femtosecond timescales in strongly light-driven nonlinear media
arxiv.org/abs/2509.19608
arxiv.org/abs/2509.19608
New preprint! Here Philipp takes a look at the connection between high harmonic generation and Bose-Einstein condensates, asking what happens to a BEC when it's hit by an intense, short laser pulse
arxiv.org/abs/2509.19022
arxiv.org/abs/2509.19022
High harmonic generation from a Bose-Einstein condensate
Lasers provide intense coherent radiation, essential to cool and trap atoms into a Bose-Einstein condensate or can alternatively drive the non-linear dynamics of high-order harmonic generation. Yet, t...
arxiv.org
September 24, 2025 at 12:03 PM
New preprint! Here Philipp takes a look at the connection between high harmonic generation and Bose-Einstein condensates, asking what happens to a BEC when it's hit by an intense, short laser pulse
arxiv.org/abs/2509.19022
arxiv.org/abs/2509.19022
Does our Research Unit endorse the view expressed by our employee here that "so much quantum tech is way over-hyped"? 🤔🤔🤔🤔
New from me at @scishow.bsky.social! In news stories, why do quantum computers look like a 'steampunk chandelier'? Well, turns out: that's not the computer!
(But that's all just setup for my rant at the end about how so much quantum tech is way over-hyped 👀👀👀)
www.youtube.com/watch?v=Lhou...
(But that's all just setup for my rant at the end about how so much quantum tech is way over-hyped 👀👀👀)
www.youtube.com/watch?v=Lhou...
Quantum Computers Look Like Chandeliers. This is Why.
YouTube video by SciShow
www.youtube.com
September 23, 2025 at 12:19 PM
Does our Research Unit endorse the view expressed by our employee here that "so much quantum tech is way over-hyped"? 🤔🤔🤔🤔
New PRL! Moha and his collaborators show how any set of n measurements on CV systems can be made compatible with the right loss channels, but also that no loss channel can break the incompatibility of all measurements.
journals.aps.org/prl/abstract...
journals.aps.org/prl/abstract...
Measurement Incompatibility under Loss
We investigate the measurement incompatibility of continuous-variable systems with infinite-dimensional Hilbert spaces under the influence of pure losses, a fundamental noise source in quantum optics,...
journals.aps.org
September 5, 2025 at 9:57 AM
New PRL! Moha and his collaborators show how any set of n measurements on CV systems can be made compatible with the right loss channels, but also that no loss channel can break the incompatibility of all measurements.
journals.aps.org/prl/abstract...
journals.aps.org/prl/abstract...
New preprint! Here, Shuheng, Marcus, and Giuseppe find Schmidt number witnesses for continuous-variable systems, connecting entanglement witnessing to the world of phase space quasiprobabilities
arxiv.org/abs/2509.02743
arxiv.org/abs/2509.02743
Entanglement Dimensionality of Continuous Variable States From Phase-Space Quasi-Probabilities
The dimensionality of entanglement is a core tenet of quantum information processing, especially quantum communication and computation. While it is natural to think of this dimensionality in finite di...
arxiv.org
September 4, 2025 at 11:00 AM
New preprint! Here, Shuheng, Marcus, and Giuseppe find Schmidt number witnesses for continuous-variable systems, connecting entanglement witnessing to the world of phase space quasiprobabilities
arxiv.org/abs/2509.02743
arxiv.org/abs/2509.02743
Alberto has a new preprint out today: here he looks at the optimal ways to extract work from two-level systems using thermodynamic protocols
arxiv.org/abs/2508.19341
arxiv.org/abs/2508.19341
Optimal Finite-Time Thermodynamics of Effective Two-Level Systems
The optimization of the conversion of thermal energy into work and the minimization of dissipation for nano- and mesoscopic systems is a complex challenge because of the important role fluctuations pl...
arxiv.org
August 28, 2025 at 9:34 AM
Alberto has a new preprint out today: here he looks at the optimal ways to extract work from two-level systems using thermodynamic protocols
arxiv.org/abs/2508.19341
arxiv.org/abs/2508.19341
New preprint from Manu, Max, and Marcus. With their colleagues they designed a minimal model of a quantum measuring device to study an important question: does it take more entropy production to extract better quality information from a measurement?
arxiv.org/abs/2508.16375
arxiv.org/abs/2508.16375
Quantum detectors as autonomous machines: assessing the nonequilibrium thermodynamics of information acquisition
We formulate a minimal model of a quantum particle detector as an autonomous quantum thermal machine. Our goal is to establish how entropy production, which is needed to maintain the detector out of e...
arxiv.org
August 25, 2025 at 11:15 AM
New preprint from Manu, Max, and Marcus. With their colleagues they designed a minimal model of a quantum measuring device to study an important question: does it take more entropy production to extract better quality information from a measurement?
arxiv.org/abs/2508.16375
arxiv.org/abs/2508.16375
THREE new preprints out from Philipp:
-A theory of above-threshold ionisation w/ squeezed light:
arxiv.org/abs/2508.01621
-A link between attosecond interferometry & weak values:
arxiv.org/abs/2508.09048
-An open-systems approach to non-linear light emission
arxiv.org/abs/2508.09049
Good stuff!
-A theory of above-threshold ionisation w/ squeezed light:
arxiv.org/abs/2508.01621
-A link between attosecond interferometry & weak values:
arxiv.org/abs/2508.09048
-An open-systems approach to non-linear light emission
arxiv.org/abs/2508.09049
Good stuff!
August 13, 2025 at 3:30 PM
THREE new preprints out from Philipp:
-A theory of above-threshold ionisation w/ squeezed light:
arxiv.org/abs/2508.01621
-A link between attosecond interferometry & weak values:
arxiv.org/abs/2508.09048
-An open-systems approach to non-linear light emission
arxiv.org/abs/2508.09049
Good stuff!
-A theory of above-threshold ionisation w/ squeezed light:
arxiv.org/abs/2508.01621
-A link between attosecond interferometry & weak values:
arxiv.org/abs/2508.09048
-An open-systems approach to non-linear light emission
arxiv.org/abs/2508.09049
Good stuff!
Reposted by QuIT Physics
New preprint! Really excited about this. It's some of my best work ever, IMO: an analytic and numerical study of the Wigner's Friend problem(s) with a specific model of the measurement process and a decohering environment.
arxiv.org/abs/2507.21221
arxiv.org/abs/2507.21221
Emergence of Classicality in Wigner's Friend Scenarios
The Wigner's Friend (WF) thought experiment concerns quantum measurements by a 'superobserver' of an observer measuring a quantum system. Variations on the setup and its extended versions have seen a ...
arxiv.org
July 30, 2025 at 8:47 AM
New preprint! Really excited about this. It's some of my best work ever, IMO: an analytic and numerical study of the Wigner's Friend problem(s) with a specific model of the measurement process and a decohering environment.
arxiv.org/abs/2507.21221
arxiv.org/abs/2507.21221
New in Light: Science & Applications: Florian joins a team presenting experimental results for a quantum key distribution method that relies on discretely-modulated continuous variables, including security proofs and more
www.nature.com/articles/s41...
www.nature.com/articles/s41...
Experimental composable key distribution using discrete-modulated continuous variable quantum cryptography - Light: Science & Applications
We demonstrate the first four-state DM CVQKD system generating composable secure keys over 20 km fiber, marking progress toward practical, high-performance, cost-effective, and highly secure QKD netwo...
www.nature.com
July 29, 2025 at 2:26 PM
New in Light: Science & Applications: Florian joins a team presenting experimental results for a quantum key distribution method that relies on discretely-modulated continuous variables, including security proofs and more
www.nature.com/articles/s41...
www.nature.com/articles/s41...
Thanks to Physics World for this fab write-up of the work by our group members, including some lovely quotes from lead author Florian
According to the 2nd law of thermodynamics, making a clock more precise means adding energy + increasing waste heat. The more precise the clock, the more entropy increases – and the tighter the limits on the clock’s precision become.
Unavoidable? Maybe not! 🧪⚛️ physicsworld.com/a/how-to-kee...
Unavoidable? Maybe not! 🧪⚛️ physicsworld.com/a/how-to-kee...
How to keep the second law of thermodynamics from limiting clock precision – Physics World
Certain types of quantum clocks could circumvent thermal dissipation, say physicists
physicsworld.com
July 29, 2025 at 2:19 PM
Thanks to Physics World for this fab write-up of the work by our group members, including some lovely quotes from lead author Florian
Reposted by QuIT Physics
(1/3) Updated on the arXiv this morning! No more painful typos and new appendices. One comparing our sample complexity with that of classical probabilistic approaches and another providing a recipe for oracles to prepare thermal machines.
arxiv.org/abs/2505.15887
arxiv.org/abs/2505.15887
July 29, 2025 at 6:37 AM
(1/3) Updated on the arXiv this morning! No more painful typos and new appendices. One comparing our sample complexity with that of classical probabilistic approaches and another providing a recipe for oracles to prepare thermal machines.
arxiv.org/abs/2505.15887
arxiv.org/abs/2505.15887
Nice piece that ends with a nice quote from our very own Max!
One hundred years after quantum mecahnics was created, Matin Durrani reveals what happened at the Helgoland 2025 cetnenary conference, which saw more than 300 top quantum physicists gather on the tiny German island. 🔭🧪⚛️
physicsworld.com/a/helgoland-...
physicsworld.com/a/helgoland-...
Helgoland 2025: the inside story of what happened on the 'quantum island' – Physics World
Matin Durrani reports from the Helgoland 2025 conference marking 100 years of quantum mechanics
physicsworld.com
July 3, 2025 at 12:53 PM
Nice piece that ends with a nice quote from our very own Max!
Congrats to QuITter Phila Rembold on being awarded an FWF ESPRIT award! Among other things, she'll be using her expertise in quantum optimal control to develop new techniques for entanglement estimation, sensing and metrology 🥳🥳
www.fwf.ac.at/forschungsra...
www.fwf.ac.at/forschungsra...
Projektdetail
www.fwf.ac.at
July 3, 2025 at 10:59 AM
Congrats to QuITter Phila Rembold on being awarded an FWF ESPRIT award! Among other things, she'll be using her expertise in quantum optimal control to develop new techniques for entanglement estimation, sensing and metrology 🥳🥳
www.fwf.ac.at/forschungsra...
www.fwf.ac.at/forschungsra...
New PRL! Here, Florian and Marcus propose a new framework for computing key rates in quantum key distribution, for the tricky case of high-dimensional entanglement
journals.aps.org/prl/abstract...
journals.aps.org/prl/abstract...
Practical Framework for Analyzing High-Dimensional Quantum Key Distribution Setups
High-dimensional (HD) entanglement promises both enhanced key rates and overcoming obstacles faced by modern-day quantum communication. However, modern convex optimization-based security arguments are...
journals.aps.org
July 3, 2025 at 10:54 AM
New PRL! Here, Florian and Marcus propose a new framework for computing key rates in quantum key distribution, for the tricky case of high-dimensional entanglement
journals.aps.org/prl/abstract...
journals.aps.org/prl/abstract...