35 citations · 88 across the 11 of their papers we have counts for
4 papers · 1 filter
Uncertainty relations with the variance and the quantum Fisher information based on convex decompositions of density matrices
Géza Tóth, Florian Fröwis
We present several inequalities related to the Robertson-Schrödinger uncertainty relation. In all these inequalities, we consider a decomposition of the density matrix into a mixtu…
Bound entangled singlet-like states for quantum metrology
Károly F. Pál, Géza Tóth, Erika Bene +1
Bipartite entangled quantum states with a positive partial transpose (PPT), i.e., PPT entangled states, are usually considered very weakly entangled. Since no pure entanglement can…
Entanglement and extreme planar spin squeezing
Giuseppe Vitagliano, Giorgio Colangelo, Ferran Martin Ciurana +3
We introduce an entanglement-depth criterion optimized for planar quantum squeezed (PQS) states. It is connected with the sensitivity of such states for estimating an arbitrary, no…
How long does it take to obtain a physical density matrix?
Lukas Knips, Christian Schwemmer, Nico Klein +3
The statistical nature of measurements alone easily causes unphysical estimates in quantum state tomography. We show that multinomial or Poissonian noise results in eigenvalue dist…