QUINTO project

Second and last call to submit oral contributions to the Quantum Matter conference, to take place in Barcelona, April 27-30 This is a very exciting and complete conference, covering all aspects of quantum technologies and quantum materials, from research to industry
www.quantumconf.eu/2026/

Two great papers on the arXiv today!

One has a title echoing that of Kitaev's "Fault-tolerant quantum computation by anyons" almost 30 years ago. Finally Anasuya Lyons and @benbrown.bsky.social shown how to make it work from encoding to decoding.

arxiv.org/abs/2602.11258

JCCM_January_2026_03 @condmatjclub.bsky.social

"Topological Quantum Orders at Finite Temperature", a commentary by Ashvin Vishwanath, Harvard University

doi.org/10.36471/JCC...

#condmat #physics

Logical qubits encoded in the fusion space of non-Abelian anyons in a generalized surface code.

Not the most efficient way to build a quantum computer, but definitely the coolest!

Quantinuum and co show how it's done on one of their H2 devices.

arxiv.org/abs/2601.20956

Has quantum advantage been achieved? Recently, I gave a couple of perspective talks on quantum advantage, one at the annual retreat of the CIQC and one at a recent KITP programme. I started off by polling the audience on who believed …

Dominik Hangleiter weighs in with an informative post about a much debated question: Has quantum advantage been achieved? This is the first post in a three-part series.
quantumfrontiers.com/2026/01/06/h...

I note that this work spans much beyond the QUINTO project (see the long acknowledgements list) and was started four years ago. I joined the group in @icfo.eu two years ago and contributed mostly numerical calculations;.
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Also, this work naturally fits with real experimental attempts to couple Rydberg arrays with optical cavities.
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Can we use the cavity to measure the anyonic excitations? Can the fact that the S=0 manifold is dark to the cavity (emits no photons into the cavity) be used to prepare the states?
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Our work opens up a number of questions: what happens with anyonic excitations with S=1? How can we understand the spin liquid if the whole theory of such systems (topological order) is based on assumption of locality, while our system is clearly nonlocal?
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This works only in S=0 sector, but it is enough, as the S=0 sector of the corresponding Heisenberg models often can host spin liquids - paradigmatic strongly-correlated phase characherized by emergent gauge fields and anyonic excitations
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Without the cavity, the Rydberg system is a classical Ising antiferromagnet. However, addition of the cavity turns the Ising model into a Heisenberg model via a counterintuitive but simple projection mechanism.
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Here, we turn the conventional wisdom on its head, showing that the cavity can actually be a *resource* pushing systems into strong correlation. What we need is to look at the S=0 manifold of the total spin and enrich it with local structure by adding a Rydberg interaction between atoms
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Why is it unexpected? An optical cavity generates equal-strength all-to-all interaction between atoms. This is usually associated with a large collective spin that can be described within the mean-field framework, incompatible with the strongly-correlated physics like spin liquids.
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The title and abstract of the paper (screenshot from Arxiv) with large red word "Preprint" written over

Here it is!

arxiv.org/abs/2512.05630

In this paper, we show unexpected emergence of the spin liquids in arrays of Rydberg atoms coupled to a single cavity mode.

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#quantum #physics #ColdAtoms #ultracold #QuantumOptics #CondMat #CondensedMatter #QuantumSimulation

It seems that the quantum info community is well represented on bsky, there is some quantum optics and cold atoms, but I didn't find many representatives of theoretical condensed matter or solid state physicists. Maybe that's because I started my search with quantum opticians.
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Any spin liquid or fractional quantum Hall effect specialists here?

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#Science #Physics #CondensedMatter #CondMat #TopologicalOrder #SolidStatePhysics #SpinLiquid #FractionalQuantumHallEffect

While the presence on Mastodon is important (open source FTW!), I decided to open an account here, especially to advertise a major preprint (partly coming from our project, but bigger than that) that will appear on Arxiv soon.
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We started in 2024 and were previously on Mastodon and Facebook (the latter rather for the outreach for Polish audiences as I'm originally from Poland), but the number of quantum physicists on Mastodon is quite limited especially since qubit-social.xyz no longer exists.
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On the left: Picture of atom array (balls denoting atoms arranged in a regular grid, wavy arrows denoting photons in between of some pairs of balls). Labels: "Atom arrays", "Quantum optics", "Paradigms of understanding many-body effects in arrays" On the right Picture of topologically distinct objects: a flattened ball, a torus, a double and triple torus. Labels "Topological order", "Condensed matter physics", "New platform for topological order". Arrows go from left to right and from right to left

Hi! We are a theoretical physics research project in ICFO, Barcelona, which tries to find a way to use atoms and light (especially: atoms arranged in regular arrays, exchanging photons) to study complex quantum states known as topological orders.
#physics #science #QuantumOptics #CondMat
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