82 citations · 127 across the 14 of their papers we have counts for
14 papers
Classification of near-normal sequences
Dragomir Z. Djokovic
We introduce a canonical form for near-normal sequences NN(n), and using it we enumerate the equivalence classes of such sequences for even n up to 30. These sequences are needed f…
On polynomial invariants of several qubits
Andreas Osterloh, Dragomir Z. Djokovic
It is a recent observation that entanglement classification for qubits is closely related to local $SL(2,\CC)$-invariants including the invariance under qubit permutations, which h…
Quaternionic matrices: Unitary similarity, simultaneous triangularization and some trace identities
Dragomir Z. Djokovic, Benjamin H. Smith
We construct six unitary trace invariants for 2 by 2 quaternionic matrices which separate the unitary similarity classes of such matrices, and show that this set is minimal. We pro…
On orthogonal and special orthogonal invariants of a single matrix of small order
Dragomir Z. Djokovic
We study the structure of the algebra of polynomial invariants for the usual conjugation action of the complex special, SO_n, and general, O_n, orthogonal group on the space of tra…
On orthostochastic, unistochastic and qustochastic matrices
Oleg Chterental, Dragomir Z. Djokovic
We introduce qustochastic matrices as the bistochastic matrices arising from quaternionic unitary matrices by replacing each entry with the square of its norm. This is the quaterni…
Skew-Hadamard matrices of orders 188 and 388 exist
Dragomir Z. Djokovic
We construct several difference families on cyclic groups of orders 47 and 97, and use them to construct skew-Hadamard matrices of orders 188 and 388. Such difference families and…