2 papers
quant-ph2026
Exploring Imaginary Coordinates: Disparity in the Shape of Quantum State Space in Even and Odd Dimensions
Simon Morelli, Santiago Llorens, Jens Siewert
The state of a finite-dimensional quantum system is described by a density matrix that can be decomposed into a real diagonal, a real off-diagonal and and an imaginary off-diagonal…
quant-ph2025
On two maximally entangled couples
Felix Huber, Jens Siewert
In a seminal article, Higuchi and Sudbery showed that a pure four-qubit state can not be maximally entangled across every bipartition. Such states are now known as absolutely maxim…