Author

Philipp A. Hoehn

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Open access Jul 2025

On the relation between perspective-neutral, algebraic, and effective quantum reference frames

The framework of internal quantum reference frames (QRFs) constitutes a universal toolset for dealing with symmetries in quantum theory and has led to new revelations in quantum gravity, gauge theories and foundational physics. Multiple approaches have emerged, sometimes differing in scope and the way symmetries are...

J. De Vuyst, Philipp A. Hoehn, Artur Tsobanjan · Quantum · 12 citations

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