Search FQXi

If you are aware of an interesting new academic paper (that has been published in a peer-reviewed journal or has appeared on the arXiv), a conference talk (at an official professional scientific meeting), an external blog post (by a professional scientist) or a news item (in the mainstream news media), which you think might make an interesting topic for an FQXi blog post, then please contact us at with a link to the original source and a sentence about why you think that the work is worthy of discussion. Please note that we receive many such suggestions and while we endeavour to respond to them, we may not be able to reply to all suggestions.

Please also note that we do not accept unsolicited posts and we cannot review, or open new threads for, unsolicited articles or papers. Requests to review or post such materials will not be answered. If you have your own novel physics theory or model, which you would like to post for further discussion among then FQXi community, then please add them directly to the "Alternative Models of Reality" thread, or to the "Alternative Models of Cosmology" thread. Thank you.

Forum Home
Terms of Use

Order posts by:
 chronological order
 most recent first

Posts by the blogger are highlighted in orange; posts by FQXi Members are highlighted in blue.

By using the FQXi Forum, you acknowledge reading and agree to abide by the Terms of Use

 RSS feed | RSS help

Peter Morgan: on 9/21/21 at 20:19pm UTC, wrote How much difference do you see between the classical and quantum parts of...

Jens Eisert: on 9/21/21 at 18:18pm UTC, wrote Date of seminar: 12 July 2021 - 4:00pm - 5:00pm (GST) Title: Learning...


Steve Dufourny: "How to formalise these couplings of scalar fields of the DE and DM in our..." in The Noise of Gravitons

Steve Dufourny: "even I d say that the numbers and the spheres are under specific partitions..." in The Noise of Gravitons

Steve Dufourny: "stop this please, FQXi is well moderated , so don t insist" in George Ellis - How can...

Martin Gray: "What are the different skin conditions that people often face? Every skin..." in George Ellis - How can...

Ulla Mattfolk: "In a statement posted on its website on 27 June, SNRIU said that "due to..." in Global Collaboration

Ulla Mattfolk: "Cont. Of the nuclear countries Sweden and Germany has said no thanks, they..." in Global Collaboration

Steve Dufourny: "Jonathan Dickau ,hope you are well, always cool to have your points of vue,..." in 16th Marcel Grossmann...

Steve Dufourny: "This platform is about theoretical physics, it is irritating to have these..." in 16th Marcel Grossmann...

click titles to read articles

The Math of Consciousness: Q&A with Kobi Kremnitzer
A meditating mathematician is developing a theory of conscious experience to help understand the boundary between the quantum and classical world.

Can We Feel What It’s Like to Be Quantum?
Underground experiments in the heart of the Italian mountains are testing the links between consciousness and collapse theories of quantum physics.

The Thermodynamic Limits of Intelligence: Q&A with David Wolpert
Calculating the energy needed to acquire and compute information could help explain the (in)efficiency of human brains and guide the search for extra-terrestrial intelligence.

Gambling Against the Second Law
Using precision thermometry to make mini heat engines, that might, momentarily, bust through the thermodynamic limit.

Mind and Machine: What Does It Mean to Be Sentient?
Using neural networks to test definitions of 'autonomy.'

July 3, 2022

CATEGORY: Blog [back]
TOPIC: Learning classical and quantum dynamical laws from data by Jens Eisert [refresh]
Bookmark and Share
Login or create account to post reply or comment.

Blogger Jens Eisert wrote on Sep. 21, 2021 @ 18:18 GMT
Date of seminar: 12 July 2021 - 4:00pm - 5:00pm (GST)

Title: Learning classical and quantum dynamical laws from data

Abstract: Traditionally, physical laws are being formulated in a largely heuristic fashion and subsequently their predictions are empirically explored. Generations of physics students are being told that Hamiltonians govern the dynamics of physical systems both in the quantum and classical realm. While this is perfectly right, much less is said on how these Hamiltonian are determined or characterized in the first place. Often, a-priori knowledge of some sort is available, but then the question emerges of how one can be sure that the actual Hamiltonian is close to the anticipated one based on physical reasoning. This issue seems particularly pressing for complex systems involving many degrees of freedom, or for systems in the quantum technologies where high precision is imperative.

These basic yet profound insights motivate efforts to learn Hamiltonians - or directly physical laws - from data. In the first part of this talk, we will be concerned with new ways of learning classical dynamical laws from data. We move on to learn instances of quantum Hamiltonians from data, and show how superconducting devices as experimented with by the Google AI team can be characterized to unprecedented precision. We will see how one can set up a tensor network based and machine learning inspired way of learning quantum many-body Hamiltonians from dynamical data. If time allows, I will mention aspects of rigorously minded quantum-assisted machine learning and of the recovery of quantum processes from data. In an outlook, we will discuss further perspectives of data-driven approaches in identifying physical laws from data.

Keywords: #iaf #quantum #foundations #data

Bookmark and Share
report post as inappropriate

This forum thread is open to the public.

Peter Warwick Morgan wrote on Sep. 21, 2021 @ 20:19 GMT
How much difference do you see between the classical and quantum parts of your talk, Jens? I wonder whether you think that Koopman's Hilbert space formalism for classical mechanics might help to bring them more together?

That's a somewhat leading question, as you'll know if you've seen my talk at IQOQI in March or my paper in Annals of Physics 2020. In both of those, I adopt a signal analysis approach to the interpretation of both classical and quantum mechanics, so I feel a lot of common cause with your approach and with your talk.

Koopman's Hilbert space formalism, however, is perhaps not as important as an algebraic understanding that nonabelian transformation algebras are as significant and as natural for classical measurement theory as they are for quantum measurement theory. Consequently, measurement incompatibility and contextuality need to be included as naturally as possible in any fully realized formalism for classical mechanics. [Even if we introduce noncommutativity into classical mechanics, there remain two other differences between classical and quantum mechanics, but I won't bother you with those here. I'll mention that I've discussed these ideas quite a bit with Marek Gluza, so you can ask him about them before responding here or elsewhere. In any case, Nice Talk!]

Bookmark and Share
report post as inappropriate

Login or create account to post reply or comment.

Please enter your e-mail address:
Note: Joining the FQXi mailing list does not give you a login account or constitute membership in the organization.