68 citations · 285 across the 25 of their papers we have counts for
25 papers
Local hidden variable values without optimization procedures
Dardo Goyeneche, Wojciech Bruzda, Ondřej Turek +2
The problem of computing the local hidden variable (LHV) value of a Bell inequality plays a central role in the study of quantum nonlocality. In particular, this problem is the fir…
Circulant matrices with orthogonal rows and off-diagonal entries of absolute value
Daniel Uzcátegui Contreras, Dardo Goyeneche, Ondřej Turek +1
It is known that a real symmetric circulant matrix with diagonal entries , off-diagonal entries and orthogonal rows exists only of order (and trivially of ord…
One-sided Diophantine approximations
Jaroslav Hančl, Ondřej Turek
The paper deals with best one--sided (lower or upper) Diophantine approximations of the -th kind (). We use the ordinary continued fraction expansions to f…
A family of quantum graph vertex couplings interpolating between different symmetries
Pavel Exner, Ondřej Turek, Miloš Tater
The paper discusses quantum graphs with a vertex coupling which interpolates between the common one of the type and a coupling introduced recently by two of the authors which e…
Periodic quantum graphs from the Bethe-Sommerfeld perspective
Pavel Exner, Ondřej Turek
The paper is concerned with the number of open gaps in spectra of periodic quantum graphs. The well-known conjecture by Bethe and Sommerfeld (1933) says that the number of open spe…
Equiangular tight frames and unistochastic matrices
Dardo Goyeneche, Ondrej Turek
In this work, we show that a complex equiangular tight frame (ETF) composed by vectors in dimension exists if and only if a certain bistochastic matrix, univocally determin…