quantumrw.bsky.social
Rafael Wagner
@quantumrw.bsky.social
1.1K followers 2.3K following 270 posts
PhD Student in quantum foundations and quantum information
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quantumrw.bsky.social
Rafael Wagner @quantumrw.bsky.social · 15d
New paper out in #PRX_Quantum! 📃📃

We show when a heat-flow reversal is actually a signature of quantum nonclassicality as described by quantum generalized contextuality.

#QuantumInformation #Contextuality #Nonclassicality #QuantumThermodynamics

journals.aps.org/prxquantum/a...
Contextuality in Anomalous Heat Flow
For a class of quantum systems that exhibit contextuality, a rigorous theoretical connection between anomalous heat flow and quantumness is established, thereby opening avenues to explore nonclassical...
journals.aps.org
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Reposted by Rafael Wagner
nicoleyh11.bsky.social
Nicole Yunger Halpern @nicoleyh11.bsky.social · 1d
Happy physics Nobel Prize to all my superconducting-qubit friends!
4 13
quantumrw.bsky.social
Rafael Wagner @quantumrw.bsky.social · 1d
Nobel prize for physics goes to physics this year
telescoper.bsky.social
El Espectro 👻 🎃 @telescoper.bsky.social · 1d
The #NobelPrize for #Physics goes to John Clarke, Michel H. Devoret and John M. Martinis “for the discovery of macroscopic quantum mechanical tunnelling and energy quantisation in an electric circuit”...

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
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quantumrw.bsky.social
Rafael Wagner @quantumrw.bsky.social · 1d
My dream conference
bartoszregula.bsky.social
Bartosz Regula @bartoszregula.bsky.social · 15d
The workshop Quantum Resources is back! The next edition will take place in Tokyo in March.

2026.quantumresources.science

Submission deadline: 31 October 2025
Workshop: 16–20 March 2026
Quantum Resources workshop 2026
The workshop "Quantum Resources 2026" will take place in Tokyo, Japan in March. Submissions welcome!
2026.quantumresources.science
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Reposted by Rafael Wagner
zhenyucai.bsky.social
Zhenyu Cai @zhenyucai.bsky.social · 2d
Can you correct both X and Z quantum noise using only a bit-flip classical codes? The answer is a surprising YES, using only ONE additional qubit and some post-processing! Check out our new work to see how:
scirate.com/arxiv/2510.0...
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Reposted by Rafael Wagner
chrisheunen.bsky.social
Chris Heunen @chrisheunen.bsky.social · 2d
Have you ever wondered why we describe circuits with matrices? I mean, circuits are about tensor products, while matrices are about direct sums. This new paper with Louis Lemonnier and @manchegobaby.bsky.social gives a practically useful explanation: arxiv.org/abs/2510.05032.
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Reposted by Rafael Wagner
schrodcatpost.bsky.social
The Schrodinger cat's Post @schrodcatpost.bsky.social · 2d
Today #quantum article selection:
- Tradeoff between rate, distance and accessibility of FT codes
- quantum sensor of superconductivity
- Quantum simulation of spectroscopy
- Quantum state preparation
- Mitigating the barren plateau

More details and links below:
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quantumrw.bsky.social
Rafael Wagner @quantumrw.bsky.social · 8d
I am very familiar with Quantum Darwinism (mostly from the Brandão, Piani, Horodecki point of view).

Its still unclear from what you wrote what is the mechanism you use to propose a concrete interpretation using a notion of continuity
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quantumrw.bsky.social
Rafael Wagner @quantumrw.bsky.social · 8d
Ok, favor, I got that.

But still, it is not clear why continuity play such a relevant role (and how it does).

What is it in your idea?
1 1
Reposted by Rafael Wagner
jjmeyer.bsky.social
Johannes Jakob Meyer @jjmeyer.bsky.social · 12d
You think we already have enough entropies and divergence measures? I don't think so!

In our latest work (arxiv.org/abs/2509.20472), we introduce yet another information theoretic measure -- the computational relative entropy.

Let's have a quick rundown👇
The distracted boyfriend meme, with the "girlfriend" being the relative entropy and the distraction being the computational relative entropy.
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Reposted by Rafael Wagner
opg.optica.org
Optica Publishing Group @opg.optica.org · 12d
Via #OPG_OpticaQ: Variational quantum cloning machine on an integrated photonic interferometer opg.optica.org/opticaq/full... #QuantumInformation #IntegratedPhotonics
3 3
quantumrw.bsky.social
Rafael Wagner @quantumrw.bsky.social · 10d
What exactly 'continuity' means here?
1 1
Reposted by Rafael Wagner
rakhim.org
Rakhim Davletkali @rakhim.org · 14d
I've heard this opinion in quantum circles a few times: NISQ-level circuit transpilation/routing/optimization is a solved problem, and we should invest all efforts into QEC transpilers.

I feel we're too eager to skip the reality of NISQ. It's here, we're here, and the software is not good.
3 1 5
Reposted by Rafael Wagner
mvscerezo.bsky.social
Marco Cerezo @mvscerezo.bsky.social · 13d
Hey quantum bsky!

Does any have any experience with becoming a Trusted Reviewer for Springer? Seems like the commitment is quite high for getting that title; you need to review one paper a month for them.

Interested in hearing anyone's thoughts on this.
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Reposted by Rafael Wagner
nicoleyh11.bsky.social
Nicole Yunger Halpern @nicoleyh11.bsky.social · 13d
Most quantum information scientists detest the noise that erodes the performance of quantum computers. QuICS postdoctoral fellow Yuxin Wang sees the glass as half-full: noise is a fascinating subject to study. From this week's JQI Seminar.
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quantumrw.bsky.social
Rafael Wagner @quantumrw.bsky.social · 13d
Duolingo now has Chess!
Reposted by Rafael Wagner
markwilde.bsky.social
Mark M. Wilde @markwilde.bsky.social · Jun 19
Two recent works joint w/ Hemant Mishra and @ludovicolami.bsky.social are ripe for quantum optics experimentalists to consider:

arxiv.org/abs/2303.04949
arxiv.org/abs/2505.20447

1st paper proves that the pretty good measurement for a bosonic Gaussian ensemble is a bosonic Gaussian measurement

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Pretty good measurement for bosonic Gaussian ensembles
The pretty good measurement is a fundamental analytical tool in quantum information theory, giving a method for inferring the classical label that identifies a quantum state chosen probabilistically f...
arxiv.org
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Reposted by Rafael Wagner
quantumyakar.bsky.social
Iftach Yakar @quantumyakar.bsky.social · 15d
Just published a Stim implementation of the [[16,4,4]] Tesseract code - the one used in Microsoft+Quantinnum's QECC experiment last year.
Simulation can be used to quickly benchmark the code under various parameters.

Contributions are welcome.
github.com/DeDuckProjec...
A plot showing the acceptance rate of the code under different noise parameters. X axis - number of rounds. Y axis - Acceptance rate A plot showing a comparison between the logical fidelity of the code under different noise parameters, with of without applying the error correction. X axis - number of rounds. Y axis - average fidelity
1 6
Reposted by Rafael Wagner
graemesmith.bsky.social
Graeme Smith @graemesmith.bsky.social · 15d
work on the rolls royce of quantum computers

rollsroyce.wd3.myworkdayjobs.com/professional...
Quantum Computing Specialist
Job Description Quantum Computing Specialist Derby - Hybrid (3 days a week on-site) 37 hours per week Rolls-Royce has an exciting opportunity for 2 Quantum Computing Specialists to join the Future Tec...
rollsroyce.wd3.myworkdayjobs.com
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quantumrw.bsky.social
Rafael Wagner @quantumrw.bsky.social · 15d
This ties to the consumption of correlations (mutual information) and a modified Clausius inequality — suggesting contextuality as a resource in quantum thermodynamics.
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quantumrw.bsky.social
Rafael Wagner @quantumrw.bsky.social · 15d
We connect out findings with experimental results on two-qubit interactions.

However, our results do not just apply to qubits: we also provide examples of two-qudit interactions where the

anomaly ⇔ contextuality

link holds generally.
1
quantumrw.bsky.social
Rafael Wagner @quantumrw.bsky.social · 15d
As one of our main results, we employ novel inequalities to show that for a broad class of energy-conserving interactions there is a critical time tau such that for any time t such that 0 < t < tau an observed heat anomaly implies a violation of a noncontextuality inequality — i.e. contextuality.
1
quantumrw.bsky.social
Rafael Wagner @quantumrw.bsky.social · 15d
We use generalized noncontextuality as the operational notion of “classical explanation.”

The notion of noncontextuality is fairly well established as a valid notion of classicality, first introduced by Robert Spekkens in 2005.

journals.aps.org/pra/abstract...
Contextuality for preparations, transformations, and unsharp measurements
The Bell-Kochen-Specker theorem establishes the impossibility of a noncontextual hidden variable model of quantum theory, or equivalently, that quantum theory is contextual. In this paper, an operatio...
journals.aps.org
1
quantumrw.bsky.social
Rafael Wagner @quantumrw.bsky.social · 15d
Classically heat flows hot → cold.

Correlations (classical or quantum) can temporarily reverse that flow. So: anomalous heat flow by itself ≠ proof of “quantumness.”

In our recent work we ask: When does anomalous heat flow force a genuinely nonclassical explanation?
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quantumrw.bsky.social
Rafael Wagner @quantumrw.bsky.social · 15d
New paper out in #PRX_Quantum! 📃📃

We show when a heat-flow reversal is actually a signature of quantum nonclassicality as described by quantum generalized contextuality.

#QuantumInformation #Contextuality #Nonclassicality #QuantumThermodynamics

journals.aps.org/prxquantum/a...
Contextuality in Anomalous Heat Flow
For a class of quantum systems that exhibit contextuality, a rigorous theoretical connection between anomalous heat flow and quantumness is established, thereby opening avenues to explore nonclassical...
journals.aps.org
1 2 9
Reposted by Rafael Wagner
anthony-leverrier.bsky.social @anthony-leverrier.bsky.social · 20d
Can ChatGPT help with research? Maybe not yet for finding new results, but it can certainly speed up some tedious tasks.

An example about quantum Tanner codes #qLDPC
Working with qudits (d=5) lets you use nice local codes [4,2,3]_5. Then the idea is simply to enumerate small groups and (1/4)
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