Living Mattar and “Negative Entropy” : Schrödinger vs. Popper

Karl Popper

Walter John Moore

James Schneeloch, H Shelton Jacinto, Christopher C. Tison +1 more

In this work, we prove that while all measures of mixedness can be used to witness entanglement, no measure of mixedness is more sensitive than the negativity of the partial transpose. However, computing either the negativity or differences between von Neumann entropies to witness entanglement requires complete knowledge of the joint density matrix (and is therefore not practical at high dimension). In light of this, we examine joint vs marginal purities as a witness of entanglement, (which can be obtained directly through interference measurements) and find that comparing purities is actually more sensitive at witnessing entanglement than using von Neumann entropies while also providing tight upper and lower bounds to it in the high-entanglement limit.

Zhao We

Popper's propensity interpretation of quantum mechanics is believed to be his outstanding contribution to physics and philosophy.The paper first introduces the traditional interpretation of quantum theory given by the Coperhagen school,then describes how Popper's propensity of quantum theory was developed.Negative comments on Popper's theory are also mentioned.

Robert Sims, Daniel Ueltschi

Flavio Del Santo, Olival Freire