373 citations · 2.9k across the 57 of their papers we have counts for
57 papers
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…
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…
Interplay of Andreev reflection and Coulomb blockade in hybrid superconducting single electron transistors
Laura Sobral Rey, David Christian Ohnmacht, Clemens B. Winkelmann +3
We study the interplay between Coulomb blockade and superconductivity in a tunable superconductor-superconductor-normal metal single-electron transistor. The device is realized by…
Correlation constraints and the Bloch geometry of two qubits
Simon Morelli, Christopher Eltschka, Marcus Huber +1
We present a novel inequality on the purity of a bipartite state depending solely on the difference of the local Bloch vector lengths. For two qubits this inequality is tight for a…
On orthogonal bases in the Hilbert-Schmidt space of matrices
Jens Siewert
Decomposition of (finite-dimensional) operators in terms of orthogonal bases of matrices has been a standard method in quantum physics for decades. In recent years, it has become i…
Characterizing generalized axisymmetric quantum states in systems
Marcel Seelbach Benkner, Jens Siewert, Otfried Gühne +1
We introduce a family of highly symmetric bipartite quantum states in arbitrary dimensions. It consists of all states that are invariant under local phase rotations and local cycli…