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Dr Jared Jeyaretnam ⚛️🧪

@jaredjeya.github.io
861 followers 497 following 299 posts

I study non-equilibrium quantum many-body physics from a quantum circuit perspective at the University of Nottingham. Also passionate about science outreach! He/him 🌐 jaredjeya.github.io PS: All opinions solely my own.

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Dr Jared Jeyaretnam ⚛️🧪 @jaredjeya.github.io · 24/08/2026
As true in the UK as it is in the US. There’s literally a levy on international students and it’s precipitated a slow-motion crisis. The UK government could step in at any time.
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Dr Jared Jeyaretnam ⚛️🧪 @jaredjeya.github.io · 31/07/2026
New paper! arxiv.org/abs/2607.26156 ⚛️🧪 We study disorder-free localisation (DFL) - an intriguing phenomenon where dynamical degrees of freedom become localised and frozen, in the absence of the strong disorder (such as a random on-site magnetic field) normally needed to induce this effect. 🧵
Figure 1. (a) Schematic of a Z2 lattice gauge theory and its mapping to an effective spin chain with n-level bond disorder.
Top: Z2 gauge fields coupled to matter, with static external “flavor” particles coupled to the matter. Middle: After gauge fixing
and eliminating matter fields (see Appendix A), the model maps to a mixed-field Ising chain with disordered couplings gj , whose
signs and magnitudes are set by the occupations of the flavor particles. Bottom: Introducing n-level ancilla
Sj+1/2 renders
the model translationally invariant, enabling efficient disorder averaging (see Sec. V). (b) Each n-level ancilla requires log2(n)
qubits, with consequences for experimental simulation of disordered models. (c) Schematic summary of the phase diagrams
obtained in this work as a function of longitudinal field h and coupling µ. For n = 2 the system remains chaotic throughout
with slow dynamics at large h, while for n>2 localized and fragmented regimes emerge at large µ and h respectively.
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David Roberts @volts.wtf · 25/07/2026
Whew, the editors of @science.org are getting real.
science.org
The Assault On Science Funding Continues
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Jacquelyn Gill @jacquelyngill.bsky.social · 29/05/2026
🧵 Public science in the US has taken some heavy hits over the last year, but the White House OMB is proposing a series of changes that will result in a TKO for science as we know it unless we fight back. Here's what's happening, and why it matters. 1/n
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Dr Jared Jeyaretnam ⚛️🧪 @jaredjeya.github.io · 25/05/2026
I’m 95% of the way towards publishing in Nature. The remaining 5% of work is focused on obtaining a groundbreaking result and writing it up.
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University and College Union (UCU) @ucu.org.uk · 22/05/2026
Equality is not conditional. Dignity at work is not negotiable. The EHRC Code of Practice has been published. UCU is examining it urgently. This is a significant and unsettling moment and we will not leave branches to navigate it alone. www.ucu.org.uk/article/1451...
Please see link for full statement. Please see link for main statement. Please see full statement.
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University of Nottingham UCU branch @uonucu.bsky.social · 20/05/2026
If you wish to support our efforts, you can do so here. Any funds donated here will be used to off set any loss income suffered by those of us mabbing. www.justgiving.com/crowdfunding... You can also donate here: UCU Nottingham LA63 Hardship Fund Account number: 20346359 Sort code: 60-83-01
justgiving.com
Help raise £10000 to support the Nottingham UCU hardship fund – JustGiving Crowdfunding
Iʼm raising money to support the Nottingham UCU hardship fund. Support this JustGiving Crowdfunding Page.
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Dr Jared Jeyaretnam ⚛️🧪 @jaredjeya.github.io · 15/05/2026
If you’re a physicist please sign this! ⚛️🧪
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Anne Green @ultrawimp.bsky.social · 14/05/2026
Physicists: please consider signing this open letter of support: nottinghamphysics.github.io/Open_Letter/ The University wants to cut a third of academic and related staff from the School of Physics and Astronomy.
nottinghamphysics.github.io
Save Nottingham Physics and Astronomy
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Astronomer Royal for Scotland | Catherine Heymans @astroroyalscot.bsky.social · 14/05/2026
Yesterday, 56 of our fab colleagues at the Physics & Astronomy dept in Nottingham, received “at risk of redundancy” letters. The Uni is planning to reduce the size of the Physics dept by almost a third.🧪⚛️🔭 Sign this petition to show them your support ✍️: nottinghamphysics.github.io/Open_Letter/
Petition statement

We, the undersigned, call on the University of Nottingham to reverse its plans to impose compulsory redundancies on its staff in the School of Physics and Astronomy.

The University threatens to cut twenty members of staff out of the seventy one currently in the School. On 12 May, fifty six of those members of staff received letters notifying them that they were at risk of redundancy. This affects academic and technical staff at all levels, from Research Fellows to Professors.
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The Hilbert Space Post @hilbertspacepost.bsky.social · 12/05/2026
In the May 12th edition: - Quantum simulation of magnetic materials - Photonic quantum machine learning - quantum metrology via partial quantum error correction - Real-time QLDPC decoding - Quantum simulation of quantum non-equilibrium steady state More details and links below:
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The Hilbert Space Post @hilbertspacepost.bsky.social · 12/05/2026
A trapped-ion quantum computer can experimentally simulate the stochastic dynamics of interacting open quantum systems in two dimensions using quantum trajectories. This enables the study of non-equilibrium transport phenomena. arxiv.org/abs/2605.08350
arxiv.org
Quantum trajectory simulation of two-dimensional non-equilibrium steady states with a trapped ion quantum processor
Digital quantum computers offer a promising route for studying complex many-body systems that are otherwise inaccessible by their classical counterparts. Capabilities including mid-circuit measurement...
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Nadia Whittome MP @nadiawhittomemp.bsky.social · 14/05/2026
Every affiliated trade union has said that Keir Starmer cannot lead us into the next election and calls for a new leader. We need to show that we’ve learnt from the government’s mistakes and get on with delivering the change that people expected. 1/2
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Glen O'Hara @gsoh31.bsky.social · 12/05/2026
What can one even say any more. The Nothing will eat almost the entire sector if controls aren't brought into force. Hey, government! Anyone there? www.bbc.co.uk/news/article...
bbc.co.uk
University of Nottingham puts 2,700 staff at risk of redundancy
The University of Nottingham says it is facing
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Dreamliner Ontario @mostlyharmless.northsky.social · 14/05/2026
I’m just going to celebrate the fact that he’s not health secretary any more 🥳
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Chris Tregenza @tregenza.bsky.social · 12/05/2026
2,700 staff at the University of Nottingham have received 'at risk' letters from the management. The same management which refused to cut their own pay, and the same management which refused to resign after losing £60 million on a disastrous attempt to build a new campus. #JoinAUnion
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Dr Jared Jeyaretnam ⚛️🧪 @jaredjeya.github.io · 12/05/2026
New paper from our group today! arxiv.org/abs/2605.08350 Using a quantum computer, we simulated trajectories of an open quantum system - that is, one that interacts with the surrounding environment, in this case by injecting particles at one end of a 2D lattice and removing them from the other. ⚛️🧪
FIG. 1. (a) The setup consists of a 4 × 4 square lattice with nearest neighbour hopping (directed arrows) and interactions (dashed line). Stochastic driving acts on the two corner sites labelled “source” (red) and “drain” (blue) with probability p.

(b) Schematic of the quantum trajectory realised by our driving scheme, showing the local density on the source (top) and the total particle number (bottom). The black line is a single trajectory, with source and drain jumps indicated by dashed lines, and grey line indicates the average.

(c) The corresponding circuit starts with unitary state preparation followed by unitary evolution using a Trotter decomposition. The non-unitary step uses an ancilla qubit for a “quantum coin flip” with probability p that classically conditions a measurement and reset on the source and drain. After m timesteps of the unitary and non-unitary drive we perform a full-circuit measurement to extract observables such as local densities and currents
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Dr Jared Jeyaretnam ⚛️🧪 @jaredjeya.github.io · 24/04/2026
This is a full-frontal attack on academic freedom. I hope some thesis advisors there will be brave enough to challenge it.
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Minas Karamanis @minaskar.bsky.social · 30/03/2026
Hey, I wrote a thing about AI in astrophysics ergosphere.blog/posts/the-ma...
ergosphere.blog
The machines are fine. I'm worried about us.
On AI agents, grunt work, and the part of science that isn't replaceable.
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Dr Jared Jeyaretnam ⚛️🧪 @jaredjeya.github.io · 05/04/2026
We were decorating hot cross buns today so I attempted to make a quantum physics one…I’ll have to work on my icing skills 😅
A brown, rounded bun with icing on it. The icing reads, in terrible handwriting, Hψ = i dψ/dt
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Dr Jared Jeyaretnam ⚛️🧪 @jaredjeya.github.io · 20/03/2026
Watched the new Spiderman trailer, why is *this* the moment I’m excited by? 😅 (No, not Bruce Banner, what’s behind him!)
A still from the new Spider-Man trailer. It shows Bruce Banner (played by Mark Ruffalo) standing in front of a presentation slide on “Lattice Quantum Chromodynamics (QCD)”, although he’s standing in the way of most of it
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Jack Bailey @jack-bailey.co.uk · 02/03/2026
I know so many immensely talented people who are just not going to get jobs in academia. The number of post-docs and job openings is so much lower than just a few years ago. The conditions are brutal.
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Dr Jared Jeyaretnam ⚛️🧪 @jaredjeya.github.io · 27/02/2026
Weirdest Disney On Ice show I’ve ever seen
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Dr Jared Jeyaretnam ⚛️🧪 @jaredjeya.github.io · 26/02/2026
A fake headline by Allister Heath reading:

The elite's fanatical obsession with quantum computing borders on a religious cult
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Dr Jared Jeyaretnam ⚛️🧪 @jaredjeya.github.io · 24/12/2025
It’s Christmas Eve, I’m on holiday in France, and somehow I’m getting emails from a journal chasing me up about whether I’m going to review a paper. They want me to reply within 3 days! Even their own offices are closed right now, according to their website…
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Dr Jared Jeyaretnam ⚛️🧪 @jaredjeya.github.io · 24/11/2025
Are they actually trying to destroy British universities???
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Nadia Whittome MP @nadiawhittomemp.bsky.social · 12/11/2025
Solidarity with @uonucu.bsky.social members striking over the possible 200+ job cuts at the University of Nottingham, after 650 staff lost their jobs in the past two years. I also share their deep concerns about new plans to suspend 48 courses, including nursing, modern languages, and music.
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Alessandra Quigley @alessandraquig.bsky.social · 09/11/2025
She smiles and says “I will always love you”
media.tenor.com
a close up of a woman 's face and neck
Alt: Dedra from Andor smiling
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Nicki Hitchcott @nickihitchcott.bsky.social · 08/11/2025
Did @uniofnottingham.bsky.social consult any students before announcing the proposed course closures? @uonucu.bsky.social www.bbc.com/news/article...
bbc.com
University of Nottingham students fight 'insane' cull of courses
Traitors composer Sam Watts is among those against plans to cut University of Nottingham courses.
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University of Nottingham UCU branch @uonucu.bsky.social · 07/11/2025
You know it's a pretty bad decision when the response from people is to create about 100 different petitions... Sign every one. Let's fight this by all means necessary.
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Dr Jared Jeyaretnam ⚛️🧪 @jaredjeya.github.io · 07/11/2025
Wake me up when this has been independently verified by an external research group!
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Dr Jared Jeyaretnam ⚛️🧪 @jaredjeya.github.io · 07/11/2025
Some petitions to sign to protest Nottingham’s cuts! #AcademicSky Save Modern Languages - c.org/D5v6qstzyW Save Agriculture - c.org/bgxhcKVHYk
c.org
Sign the Petition
Stop the removal of Modern Languages courses at the University of Nottingham!
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Tony Padilla #JFT97 Don’t buy the S*n @proftonypadilla.bsky.social · 06/11/2025
Mathematical Physics MSci at UoN earmarked for closure as mgmt start the cuts. As the custodians of Einstein’s famous blackboard, this is especially worrying. Will we still teach his greatest ideas in years to come? @uonucu.bsky.social @ucu.org.uk
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University of Nottingham UCU branch @uonucu.bsky.social · 06/11/2025
It's not just music and language courses- it's 48 courses across the university. But here's the thing- our UCU colleagues at other universities (like @Cardiffucu.bsky.social) have faced the exact same threats, fought back, and won. So we can too.
A screenshot of a BBC story with the headline "University to suspend music and language courses"A screenshot of a BBC story with the following headline "University scraps plan to cut music and languages"
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Dr Jared Jeyaretnam ⚛️🧪 @jaredjeya.github.io · 06/11/2025
I can't express how damaging this is, music and languages aren't just optional extras, they are at the core of what a university does: cultivate knowledge and culture in the next generation. And if they'll cut those, what's next? It's institutional self-destruction. www.bbc.com/news/article...
bbc.com
Music and modern languages courses suspended at University of Nottingham
In a statement the institution also says it is "proposing to reduce its nursing offer".
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Dr Jared Jeyaretnam ⚛️🧪 @jaredjeya.github.io · 02/11/2025
I’ve always thought the problem with quantum computers is that they don’t cost nearly enough money (ideally, at least a million dollars per kg!), and should experience heavy vibrations and crushing G-forces after being calibrated. ⚛️🧪
E*** M*** on X, The Everything App:

“Quantum computing is best done in the permanently shadowed craters on the Moon”

107,000 idiots have liked this Xeet.
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Omar Rivasplata @omarrivasplata.bsky.social · 18/10/2025
Reminder of the preferred approach when sharing arXiv preprint links
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Katie Mack @astrokatie.com · 03/10/2025
As a theoretical cosmologist, I'm frequently asked "what is the benefit of the work you're doing for people's lives?" Nothing I work on makes money or cures disease. There are a few different answers one can give, at various levels of "convincing" / "actually relevant to why the work is done." 1/🧵
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Tony Padilla #JFT97 Don’t buy the S*n @proftonypadilla.bsky.social · 27/09/2025
Dear students, unless UoN commits to rule out compulsory redundancies, I expect my Principles of Dynamics lectures to be affected by @uonucu.bsky.social industrial action next week. I was gonna tell you by email but the uni says we can’t. If you see this, pls let other students know
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Dr Jared Jeyaretnam ⚛️🧪 @jaredjeya.github.io · 26/09/2025
Just finished the final day of the Nottingham Workshop on Quantum Non-Equilibrium Dynamics!! Lots of great talks, and great discussions too 😄
A photo of one of the talks. People are sitting in chairs watching someone present a talk, specifically Mark Mitchison (KCL) on the topic of process tensors.
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University of Nottingham UCU branch @uonucu.bsky.social · 19/09/2025
We have made it clear from the beginning: our industrial action ends as soon as the university agrees to no compulsory redundancies. This is a demand that the university takes on the responsibility and consequences of their poor financial decisions without putting it on us.
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University of Nottingham UCU branch @uonucu.bsky.social · 19/09/2025
After hearing this news, UCU branch representatives reached out to the university again demanding that compulsory redundancies for our members be suspended. They declined to remove this threat.
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Dr Jared Jeyaretnam ⚛️🧪 @jaredjeya.github.io · 20/09/2025
It’s a really dire situation in UK academia. Here at Nottingham, we’re being told to expect 20% cuts across the board. All because the university mismanaged its money: spending millions on a new campus without a plan, that now has to be sold! And now they want £50m more for a new medical building.
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Dr Jared Jeyaretnam ⚛️🧪 @jaredjeya.github.io · 19/09/2025
Check out my brand new handle 😎 By the way, this was literally as easy as uploading a single text file to my website (and making it publicly available). A simple guide: lucacozzuto.medium.com/how-to-use-g...
lucacozzuto.medium.com
How to use GitHub to be verified on Bluesky
Like many scientists, I joined Buesky since X (former Twitter) is becoming a horrible place. Here you don’t need to pay the platform to be…
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University of Nottingham UCU branch @uonucu.bsky.social · 18/09/2025
If you want to know more about our strike action, you can find it here: www.canva.com/design/DAGzC...
canva.com
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University of Nottingham UCU branch @uonucu.bsky.social · 15/09/2025
Strike action is ON!!! Next week will be the first of 4 weeks of striking from our members as we continue to say NO to the compulsory redundancies forced on us by the university for their poor financial choices. #StopTheCuts #SaveHE
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Dr Jared Jeyaretnam ⚛️🧪 @jaredjeya.github.io · 19/09/2025
Good news. The Royal Society has disgraced itself by keeping one of the most evil people in the world among its ranks. (In case you need reminding, it's estimated his cuts to USAID had ALREADY killed hundreds of thousands of people by July, and will kill 14 million by 2030)
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Dr Jared Jeyaretnam ⚛️🧪 @jaredjeya.github.io · 10/09/2025
The British Isles, according to the New York Times. (I think some of my old colleagues from Leeds might have an aneurysm if they see this!)
A screenshot from a New York Times article: 

"I have great sympathy for the police," said Paul Wragg, a professor of media law at the University of Leeds, north of London. He said that the public would likely be…”An outline map of the British Isles. London is labelled, and every other part is labelled relative to London: for example, Wales is “West of London”, Scotland is “far north of London”, and Ireland is “Far west of London”
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Dulwich Quantum Computing @dulwichquantum.bsky.social · 13/08/2025
"My bold prediction? Scholar gets the axe within 5 years. Google will announce it with 12 months' notice, Bluesky will have a collective meltdown, universities will scramble for alternatives, and research workflows will be in chaos for years."
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