47 citations · 96 across the 7 of their papers we have counts for
7 papers
Local numerical range for a class of hermitian operators
J. Jurkowski, A. Rutkowski, D. Chruściński
A local numerical range is analyzed for a family of circulant observables and states of composite systems. It is shown that for any circulant operator $\…
On separable decompositions of quantum states with strong positive partial transposes
Bogna Bylicka, Dariusz Chruściński, Jacek Jurkowski
We analyze a class of positive partial transpose states (PPT) such that the positivity of its partial transposition is recognized with respect to canonical factorization of the ori…
Discord Derived from Tsallis Entropy
Jacek Jurkowski
Due to some ambiguity in defining mutual Tsallis entropy in the classical probability theory, its generalization to quantum theory is discussed and, as a consequence, two types of…
Estimating Concurrence via Entanglement Witnesses
Jacek Jurkowski, Dariusz Chruscinski
We show that each entanglement witness detecting given bipartite entangled state provides an estimation of its concurrence. We illustrate our result with several well known example…
Quantum states with strong positive partial transpose
Dariusz Chruscinski, Jacek Jurkowski, Andrzej Kossakowski
We construct a large class of bipartite M x N quantum states which defines a proper subset of states with positive partial transposes (PPT). Any state from this class is PPT but th…
Memory in a nonlocally damped oscillator
Dariusz Chruscinski, Jacek Jurkowski
We analyze the new equation of motion for the damped oscillator. It differs from the standard one by a damping term which is nonlocal in time and hence it gives rise to a system wi…