News

• 27 Oct 2026 New paper on arXiv: Felix, Daniel and Davide present an algorithm that decides, from the coefficients of a Hermitian polynomial in x and p alone, whether it defines exactly one quantum dynamics, none, or infinitely many — and a web interface that runs it in the browser.

• 27 Jul 2026 New paper on arXiv: Felix, Daniel and Davide establish that a wide family of operators describing k-photon light–matter interactions (k≥3), including the k-photon Rabi model, admit distinct self-adjoint realizations indexed by 2k×2k unitary matrices.

• 25 May 2026 New paper on arXiv: Lenni, Daniel and Davide provide a general construction of effective Hamiltonians approximating the dynamics of unbounded time-periodic Hamiltonians up to the desired order, and show that it reproduces the Floquet–Magnus (FM) expansion whenever the latter is defined, thus providing the first extension of FM to the unbounded case.

• 21 May 2026 New paper on arXiv: Felix, Daniel and Davide analyze how the full family of self-adjoint extensions of some Jacobi operators can be reproduced via small diagonal perturbations, and apply this knowledge to higher-order squeezing operators in quantum optics.

• 12 May 2026 The 2nd Erlangen–Padernorn mini-workshop will take place on 22 May 2026 in Erlangen, close to the Bergkirchweih venue. See here for all details.