Otfried Gühne

Multiparticle singlet states cannot be maximally entangled for the bipartitions

2022 · arXiv (Cornell University)

One way to explore multiparticle entanglement is to ask for maximal entanglement with respect to different bipartitions, leading to the notion of absolutely maximally entangled states or perfect tensors. A different path uses unitary invariance …

Certifying the Topology of Quantum Networks: Theory and Experiment

2023 · arXiv (Cornell University)

Distributed quantum information in networks is paramount for global secure quantum communication. Moreover, it finds applications as a resource for relevant tasks, such as clock synchronization, magnetic field sensing, and blind quantum computation. For quantum …

Error estimation of different schemes to measure spin-squeezing inequalities

2023 · arXiv (Cornell University)

How can we analyze quantum correlations in large and noisy systems without quantum state tomography? An established method is to measure total angular momenta and employ the so-called spin-squeezing inequalities based on their expectations and …

Entanglement purification of hypergraph states

2023 · Physical Review A

Entanglement purification describes a primitive in quantum information processing, where several copies of noisy quantum states are distilled into a few copies of nearly pure states of high quality via local operations and classical communication. …