1 citations · 1 across the 5 of their papers we have counts for
5 papers
Confident entanglement detection via separable numerical range
Timo Simnacher, Jakub Czartowski, Konrad Szymański +1
We investigate the joint (separable) numerical range of multiple measurements, i.e., the regions of expectation values accessible with (separable) quantum states for given observab…
Universal witnesses of vanishing energy gap
Konrad Szymański, Karol Życzkowski
Energy gap, the difference between the energy of the ground state of a given Hamiltonian and the energy of its first excited state, is a parameter of a critical importance in analy…
Quantum correlations protection through spin self-rephasing in 1-D Bose gas
Konrad Szymański, Krzysztof Pawłowski
System consisting of a number of trapped atoms evolving under the influence of external inhomogenous magnetic field undergoes spin dephasing: classically, since each atom feels dif…
Evolution of entanglement under an Ising-like Hamiltonian with particle losses
Konrad Szymański, Krzysztof Pawłowski
We present analytical compact solution for the density matrix and correlation functions of two collective-macroscopic spins evolving via Ising-like Hamiltonian in the presence of p…
Uncertainty relations and joint numerical ranges
Konrad Szymański
Noncommutativity lies in the heart of quantum theory and provides rich set of interesting questions in physics and mathematics. In this work I present some of them through the conc…