Oscar Dahlsten

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Oscar Dahlsten

Research Fellow, College Lecturer

I work on quantum information theory, including:

  • Role of information entropy in statistical mechanics (Szilard engines, Landauer's erasure, Second law, smooth entropies, single-shot statistical mechanics)
  • Typical entanglement in many-body systems (most states are maximally entangled, why is that, is it physically relevant or just a mathematical curiosity?)
  • Generalised probabilistic theories (non-local PR-boxes, axioms for quantum theory, generalised statistical mechanics, computational power of different theories).
  • Power of quantum computation, is it really better than classical and if so why?
  • Ontology for quantum effects, what is the quantum world made up of?
  • Consulting on quantum technologies and quantitative statistical models.

For more details see my publications on the arXiv.

2 new papers on arXiv:
Organic molecule fluorescence as an experimental test-bed for quantum jumps in thermodynamics
Tunnelling necessitates negative Wigner function

My view: EU referendum outcome creates a big challenge and distraction for UK science and technology, I agree with the mainstream view in UK academia on that. I was not allowed to vote but would certainly have voted IN. Here is something I wrote in the Guardian. A student I supervise was attacked on the night before the referendum and shouted at to go home, this was reported by the student and the police said this was part of a pattern of attacks in that area of London. I think we should stand firm against this wave of right-wing populism and respond proactively rather than feel destitute and victimised. Two key tasks seem to be: (i) find alternative communication channels to people than media controlled by the likes of Murdoch, in particular we need more European and international media (ii) equalising mechanisms-not cash handouts but spending on schools, libraries, training, youth services, tax cuts for low-end incomes etc. I also note an interesting article in a Swedish newspaper describing how the social democrats in the 30's cleverly appropriated the far right notions of Nation and People with the inclusive version of Folkhemmet ; this apparently completely swept away the rug from under these sinister movements.

Photonic Maxwell's Demon published arXiv| PRL Editor's suggestion |Oxford Science Blog| quantumlah | Phys.org.

Excited and honoured to be a Fellow of the London Institute for Mathematical Sciences.

Vlatko Vedral and myself are announcing an online course: What is reality? Quantum information and Computation. The starting date will be announced soon.

See for a highlight by Jenny Hogan on our recent paper relating to quantum pirouettes and also a blog I wrote about it for fqxi: "Quantum theory escapes locality by accepting uncertainty". And slides from a colloquium talk at Korea University Physics Department. And two videos of my tutorials at QPL 2015 on (i) entropy and majorisation in probabilistic theories.

See press-release for a recent Nature paper.

And a blog about another recent paper.

I did my Undergraduates and PhD at Imperial College London. Since then I have been at ETH and NUS Singapore. I taught 2/3 of the Advanced Solid State course to 40+ graduate students at NUS in the spring 2011. Presently I am moreover a Research Fellow of Wolfson College and a Lecturer for St Catherine's College.

Our offices in the Physics Department, Clarendon Laboaratory, are notoriously difficult to find, so pay attention.

You can take a train to Oxford from London, prebooking can be much cheaper. You can also go directly from Heathrow.

The physics dept is here:
Note that we are in the Clarendon laboratory.
Our (Vedral group) location in the laboratory is shown here: