45 citations · 248 across the 19 of their papers we have counts for
19 papers
Multiqubit UPB: The method of formally orthogonal matrices
Lin Chen, Dragomir Z. Djokovic
We use formal matrices whose entries we view as vector variables taking unit vectors values in one-qubit Hilbert spaces of a multiqubit quantum system. We construct many unextendib…
Orthogonal product bases of four qubits
Lin Chen, Dragomir Z Djokovic
An orthogonal product basis (OPB) of a finite-dimensional Hilbert space is an orthonormal basis of consisting of product vectors $x_1…
Length filtration of the separable states
Lin Chen, Dragomir Z Djokovic
We investigate the separable states $\r$ of an arbitrary multipartite quantum system with Hilbert space $\cH$ of dimensionin . The length of $\r$ is defined as the small…
Symmetric Hadamard matrices of order 116 and 172 exist
Olivia Di Matteo, Dragomir Z. Djokovic, Ilias S. Kotsireas
We construct new symmetric Hadamard matrices of orders , and . While the existence of those of order was known since 1978, the orders and are new. Our…
Dimension formula for induced maximal faces of separable states and genuine entanglement
Lin Chen, Dragomir Z. Djokovic
The normalized separable states of a finite-dimensional multipartite quantum system, represented by its Hilbert space , form a closed convex set . The set ${\…
Periodic Golay pairs of length 72
Dragomir Z. Djokovic, Ilias S. Kotsireas
We construct supplementary difference sets (SDS) with parameters . These SDSs give periodic Golay pairs of length 72. No periodic Golay pair of length 72 was known p…