Author

N. Gisin

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Preprint Sep 2026

Quantum models of interaction Hamiltonians and their paradoxes

In quantum physics it is commonplace to model the interaction of remote systems with a many-body Hamiltonian. Taking such an action-at-a-distance description {\it \`a la lettre} leads to various paradoxes related to faster-than-light communication and apparent inconsistencies in local energy accounting. It also neglect...

N. Gisin, S. Massar, Jef Pauwels et al. · 0 citations

Preprint Jul 2026

Uncountably many inequivalent maximally entangled measurements for two qutrits

Every two-qubit measurement basis composed of maximally entangled eigenstates can be transformed into the Bell basis via local unitary operations. For higher dimensions, in contrast, there exist inequivalent bases composed of maximally entangled eigenstates. Here, we provide a single-parameter family of two-qutrit maxi...

Elna Svegborn, Jef Pauwels, N. Gisin et al. · 0 citations

Preprint Jul 2026

Tunable Families of Multiqubit Elegant Joint Measurements

We give a closed-form construction of the $n$-qubit Elegant Joint Measurement (EJM) proposed in [PRL \textbf{136}, 190201 (2026)] and show that it is part of a tunable family of measurements with tetrahedrally arranged Bloch vectors. The construction is based on the interference pattern implied by a single phase polyno...

Jef Pauwels, N. Gisin · 1 citation