Author

C. S. Wever

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Preprint Jul 2026

Maximal complementarity in the n-qubit Pauli group

Observables in quantum mechanics are generally complementary, that is, they reveal mutually incompatible pieces of information about a given system. This property is not only a fundamental tenet of the quantum formalism, but also a key component in quantum cryptographic protocols. As such it has fuelled much research i...

Markus Frembs, Giovanni Natale, C. S. Wever et al. · 3 citations

Preprint Jul 2026

An algebraically closed family of informational n-qubit purity invariants

We present a family of quadratics in Pauli expectation values, and prove that they constitute state-independent invariants for all n-qubit pure states. This family generalises the two-qubit `pentagon identities', discovered in the reconstruction programme of [P. A. H\"ohn, Quantum 1, 38 (2017), P. A. H\"ohn and C. S. P...

Markus Frembs, Giovanni Natale, C. S. Wever et al. · 2 citations