119 citations · 175 across the 6 of their papers we have counts for
7 papers · 1 filter
Single-particle entanglement
M. Ali Can, Alexander Klyachko, Alexander Shumovsky
Using the approach to quantum entanglement based on the quantum fluctuations of observables, we show the existence of perfect entangled states of a single "spin-1" particle. We giv…
Quantum marginal problem and representations of the symmetric group
Alexander Klyachko
We discuss existence of mixed state of multicomponent system with given spectrum and given reduced density matrices. We give a complete solution of the problem in terms of linear i…
Angular Momentum of Photons Emitted by Atoms
M. A. Can, Ozgur Cakir, A. Horzela +3
It is shown that the spin and orbital angular momentum of electric dipole photons have the same operator structure and may differ from each other only by spatial dependence in the…
Entanglement and quantum fluctuations
Alexander A. Klyachko, Alexander S. Shumovsky
We discuss maximum entangled states of quantum systems in terms of quantum fluctuations of all essential measurements responsible for manifestation of entanglement. Namely, we cons…
Coherent states, entanglement, and geometric invariant theory
Alexander Klyachko
The main objective of the paper is to unveil an adequate mathematics hidden behind entanglement, that is Geometric Invariant Theory. More specifically relation between these two su…
Entangled States and Local Measurements
Alexander A. Klyachko, Alexander S. Shumovsky
We show that the maximum entanglement in a composite system corresponds to the maximum uncertainty and maximum correlation of local measurements.