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Mastodon @chrisheunen@mathstodon.xyz

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Followers

122

Account age

3 yrs

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Known for

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 @llemonnier and @manchegobaby.bsky.social gives a practically useful explanation: arxiv.org/abs/2510.05032.
The key is that circuits contain controlled gates. It's not quite data flow, nor control flow, in the usual computer science se

26 views 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 @llemonnier and @manchegobaby.bsky.social gives a practically useful explanation: arxiv.org/abs/2510.05032. The key is that circuits contain controlled gates. It's not quite data flow, nor control flow, in the usual computer science se

Coverages, or Grothendieck topologies, describe when a collection of regions covers another region in a space. But what if your space is a spacetime? The topological space may have a causal order saying which (spacetime) points 'come before' which other points, for example.
Well, you don't need points to describe that, and can do it purely with open sets. This new paper with Nesta van der Schaaf d

7 views Coverages, or Grothendieck topologies, describe when a collection of regions covers another region in a space. But what if your space is a spacetime? The topological space may have a causal order saying which (spacetime) points 'come before' which other points, for example. Well, you don't need points to describe that, and can do it purely with open sets. This new paper with Nesta van der Schaaf d

📊 Post engagement

📊 Activity & format

Posting cadence

0.07 / week

A lower-frequency account — each post lands with more weight.

Content mix

Mostly text

Recent: 10 text · 2 image · 0 video.

Follower / following

4.7×

Follows 26 back. A more reciprocal / networked account.

Recent posts

View on Mastodon ↗

🔥 Top post I really like this paper, with @JacquesC2, @rkaarsgaard , and Amr Sabry: "With a few square roots, Quantum Computing is as easy as Pi", https://arxiv.org/abs/2310.14056, to appear at POPL24. The idea is that you can forget about all details of matrices and build up quantum comp… ★ 87

Now published as Editor's Pick in the Journal of Mathematical Physics: https://doi.org/10.1063/5.0332267 ★ 4 Quantum computing is usually framed in complex linear algebra. This paper asks: what is the least you need to add to reversible classical computing to recover quantum computation? https://www.pnas.org/doi/10.1073/pnas.2510881123 The answer… ★ 33

Coverages, or Grothendieck topologies, describe when a collection of regions covers another region in a space. But what if your space is a spacetime? The topological space may have a causal order saying which (spacetime) points 'come befor… ★ 7 So much material for titles here, too! "If you liked it you shoulda put a rig on it", "The rig is up", "Taking back control". What's your favourite? ★ 3

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 @llemonnier and @manchegobaby.bsky.social gives a practically useful expla… ★ 26 🚨 New preprint alert 🚨 Always wanted to know the connection between analytic limits and categorical limits? Tired of having to establish directed colimits of contractions when directed colimits of isometries suffice? You're in luck! This … ★ 12 The saga continues! Axioms for the category of finite-dimensional Hilbert spaces and linear contractions, with Matt Di Meglio, now on https://arxiv.org/abs/2401.06584. After axiomatising Hilbert spaces and bounded linear maps, and Hilbert… ★ 22 New paper alert! "Categories of sets with infinite addition", with Pablo Andres-Martinez, https://arxiv.org/pdf/2308.15183. In a commutative monoid you can add finitely many elements. But why stop at finite? This paper is about sets where… ★ 3 We're looking for three postdocs on Quantum Programming for three years each! Be part of a large team in Quantum Informatics, and the NQCC Quantum Software Lab. Apply here: https://elxw.fa.em3.oraclecloud.com/hcmUI/CandidateExperience/en/s… ★ 15 CATNIP: June 14, Edinburgh https://sites.google.com/view/catniporg/home Spread the word! ★ 5 We are hiring up to two Chancellor’s Fellows with a strong track record in the area of quantum computation. Join a wonderful team in lovely Edinburgh! https://elxw.fa.em3.oraclecloud.com/hcmUI/CandidateExperience/en/sites/CX_1001/job/7240

🐘 Community & instance

Home server

mathstodon.xyz

Their home server on the fediverse — the instance a creator picks signals the community they belong to.

On Mastodon since

Dec 2022

Joined in the Twitter-exodus wave of late 2022 — part of the migration that made Mastodon a real destination.

💡 Facts

🗓️Joined Mastodon in 2022 — 3 years ago.

👁️Averages 20 views per post.

📤Posts about 0.1× per week.

🕵️ Fake follower check

Estimated

66/100

Good Credibility score

89%

Real Real audience

Low Fake-follower risk

High Data confidence

Est. 89% real, active audience · Low fake-follower risk.
Engagement (~0.2× of followers engage each post) is around typical for Mastodon.
Established account (3+ years old).

Heuristic estimate from engagement, follower ratios, account age & growth — a screening signal, not a guarantee.

About

Computer scientist, mathematician, father, karateka, pianist

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Google 31.9M

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🔀 Audience overlap

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Estimated shared audience with similar creators — useful for avoiding overlap (or doubling down) when planning a campaign.

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122 Followers

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