@QuSysTCD

Group working on the boundaries between quantum theory, thermodynamics and non-equilibrium condensed matter lead by John Goold at Trinity College Dublin.

 Trinity College Dublin
qusys-tcd.com
Joined October 2017
  • Tweets4.4K
  • Following825
  • Followers1.5K
534Media
It's immensely satisfying when something that you have been thinking about for eight years gets finished - thanks to two outstanding @TCD_physics @QuSysTCD students Laetitia and Artur - the story of Information Geometry of NESS to NESS transitions is out: arxiv.org/abs/2501.08858
2
1
29
2,041
Goold_Group retweeted
Physical Review X@PhysRevX
Mar 25
This paper shows how resource theory provides a unified language to describe all Mpemba effects, demonstrating that both the thermal Mpemba effect and its symmetry-restoring analogues arise from the overlap of initial states with the slowest relaxing mode: go.aps.org/4bz3hS8
An illustration on the left is labeled resource theories and a graph on the right is labeled Mpemba effect. Inside of the illustration are icons labeled athermality, asymmetry, non-stationarity, and quantum coherence. It depicts how, in a resource-theoretic framework, the Mpemba effect occurs when a state that initially possesses more of a given resource depletes that resource faster than a less resourceful state, under the evolution by the same free operation, so that their resource monotones cross. An arrow points from the illustration to a graph with time on the x axis and resourcefulness on the y axis. A solid line is labeled p̂1 and a dashed line p̂2. The intersection of the lines is labeled Tc.

ALT An illustration on the left is labeled resource theories and a graph on the right is labeled Mpemba effect. Inside of the illustration are icons labeled athermality, asymmetry, non-stationarity, and quantum coherence. It depicts how, in a resource-theoretic framework, the Mpemba effect occurs when a state that initially possesses more of a given resource depletes that resource faster than a less resourceful state, under the evolution by the same free operation, so that their resource monotones cross. An arrow points from the illustration to a graph with time on the x axis and resourcefulness on the y axis. A solid line is labeled p̂1 and a dashed line p̂2. The intersection of the lines is labeled Tc.

2
14
46
8,887
In todays preprint we uncover universal thermodynamic scaling in dissipative quantum phase transitions arxiv.org/abs/2512.05074 . Using information geometry we show that the nonadiabatic entropy production scales universally with quench time
1
129
Very happy to be involved in this great work - a PRB editor’s suggestion by @tcddublin student Peter O Donavan
Physical Review B@PhysRevB
1 Aug 2025
PRB Editors' Suggestion: #Quantum master equation from the eigenstate #thermalization hypothesis P. O'Donovan, P. Strasberg, K. Modi, J. Goold, and M. T. Mitchison PRB 112, 014312 ➡️ go.aps.org/46swGLA #OpenAccess #EdSugg @APSPhysics #physics #condmat @modikk @QuSysTCD
EDITORS' SUGGESTION Quantum master equation from the eigenstate thermalization hypothesis 22 July, 2025 In the theory of open quantum systems, a thermal environment is usually modelled as an infinite, noninteracting system described by an equilibrium Gibbs ensemble. Here, instead, the authors show that chaos – as encoded by the eigenstate thermalisation hypothesis – suffices to derive a quantum master equation, which describes the effect of finite-sized, strongly interacting, nonequilibrium environments without invoking a thermal ensemble. The results are directly relevant to experiments on impurities coupled to isolated quantum many-body systems, e.g., ultracold atomic gases. Peter O'Donovan et al. Phys. Rev. B 112, 014312 (2025)

ALT EDITORS' SUGGESTION Quantum master equation from the eigenstate thermalization hypothesis 22 July, 2025 In the theory of open quantum systems, a thermal environment is usually modelled as an infinite, noninteracting system described by an equilibrium Gibbs ensemble. Here, instead, the authors show that chaos – as encoded by the eigenstate thermalisation hypothesis – suffices to derive a quantum master equation, which describes the effect of finite-sized, strongly interacting, nonequilibrium environments without invoking a thermal ensemble. The results are directly relevant to experiments on impurities coupled to isolated quantum many-body systems, e.g., ultracold atomic gases. Peter O'Donovan et al. Phys. Rev. B 112, 014312 (2025)

1
388
Physicists disagree wildly on what quantum mechanics says about reality, Nature survey shows nature.com/articles/d41586-0…
1
202
Our latest work is finally out - unifying many seemingly disparate instances of the notorious Mpemba effect in classical and quantum dynamics such as symmetry restoration and thermalisation using a resource theoretical approach: read here: arxiv.org/abs/2507.16976
10
567
Great to see the latest @QuSysTCD @tcddublin paper on Physical Review Letters today - where we show that quantum batteries with higher charge can discharge faster than less charged ones and other anomalous effects journals.aps.org/prl/abstrac…
2
12
570
Minister @lawlessj has secured Government approval to sign the European Quantum Pact, a joint declaration by EU science ministers recognising the transformative potential of quantum technologies. 🔗 gov.ie/en/department-of-furt…
4
3
7
1,010
The latest work from @QuSysTCD @tcddublin. Great work by postdoc Sam Jacob who derived Kubo formulae without time dep classical driving but rather autonomously by another quantum particle. A generalised FDT appears outside of linear response read here arxiv.org/abs/2505.03686
2
339
And it’s done - now time for a beer
5
366
Mountain biking the northern route of the Camino to Santiago - spectacular
3
471
Delighted to announce that we've signed a non-binding letter of intent with dMY Squared Technology Group to take @horizon_quantum public. We couldn't ask for better partners on the journey to the public markets than Harry You and @NiccoloDeMasi. horizonquantum.com/updates/n…

Horizon Quantum and dMY Squared Sign Non-Binding Letter of Intent for a Business Combination

Horizon Quantum and dMY Squared, a publicly traded special purpose acquisition company led by Harry You, have entered into a non-binding letter of intent for a business combination.

horizonquantum.com
11
11
6
64
12,137
All You Ever Wanted to Know About Quantum Error Correction In a brief yet thorough summary that appeared last week on the pre-print server, a group of quantum computing experts discussed the challenges on the way to commercially relevant quantum computers. Among other things, they confirm that speedups from quantum computers can reliably be expected for certain problems but that quantum error correction still has a long way to go to scale with platform size.
3
5
25
8,111
Interested in a career in Quantum? 💼 Don’t miss the #QuantumCareerFair tomorrow, Jan. 22, hosted by the U.S. Department of Energy (DOE) and its National Quantum Information Science (QIS) Research Centers. 📍 Register for free today: bnl.gov/nqisrccareerfair/exh…
2
13
1,144
Nice to have this one published - well done again to @QuSysTCD PhD student Laetitia Bettmann: Information geometry approach to quantum stochastic thermodynamics journals.aps.org/pre/abstrac…

Information geometry approach to quantum stochastic thermodynamics

Recent advancements have revealed new links between information geometry and classical stochastic thermodynamics, particularly through the Fisher information (FI) with respect to time. Recognizing...

journals.aps.org
1
16
881
I really like this perspective paper that provides some (as neutral as possible) consensus on timely questions in the field of quantum computing, as well as debunking myths. We need more of this. Thanks for the initiative!
Zoltán Zimborás@ZoltanZimboras
13 Jan 2025
To reach some consensus about the prospects of near-term (nisq and early ft) quantum computing, we had a 3-day discussion event (“Quantum Now”) in Lapland with both optimists and pessimists. This continued at SeeQA 2024 in Oxford. See our conclusions here arxiv.org/abs/2501.05694
1
6
1,024
Goold_Group retweeted
John Preskill
@preskill
14 Jan 2025
Useful perspective, clearly written and well-reasoned. arxiv.org/abs/2501.05694

Myths around quantum computation before full fault tolerance: What...

In this perspective article, we revisit and critically evaluate prevailing viewpoints on the capabilities and limitations of near-term quantum computing and its potential transition toward fully...

arxiv.org
9
74
5
295
30,231
Goold_Group retweeted
Zoe Holmes@qZoeHolmes
13 Jan 2025
We had fun arguing about the prospects of near-term quantum computing in Lapland/Oxford In arxiv.org/abs/2501.05694 we frame our (reasonably converged) conclusions around common 'myths' concerning error mitigation, VQAs and resource estimates. Feedback/discussion welcomed!
Zoltán Zimborás@ZoltanZimboras
13 Jan 2025
To reach some consensus about the prospects of near-term (nisq and early ft) quantum computing, we had a 3-day discussion event (“Quantum Now”) in Lapland with both optimists and pessimists. This continued at SeeQA 2024 in Oxford. See our conclusions here arxiv.org/abs/2501.05694
6
16
2
83
6,593
To reach some consensus about the prospects of near-term (nisq and early ft) quantum computing, we had a 3-day discussion event (“Quantum Now”) in Lapland with both optimists and pessimists. This continued at SeeQA 2024 in Oxford. See our conclusions here arxiv.org/abs/2501.05694
1
16
3
61
11,346
arxiv.org/abs/2501.05694 super perspective about myths around quantum computation before full fault tolerance today on arxiv - lead by the. great @ZoltanZimboras - super happy to be involved- it was the result of a three day discussion group at a workshop in Lapland last year
4
21
1,177
Load more