"Direct versus measurement-assisted bipartite entanglement in multiqubit systems and their dynamical generation in spin systems"@en . "518212" . . . . "quantum entanglement; spin systems"@en . "12"^^ . . . "Rap\u010Dan, Peter" . . . . "US - Spojen\u00E9 st\u00E1ty americk\u00E9" . "000231564200053" . "We consider multiqubit systems and relate quantitatively the problems of generating cluster states with high values of concurrence of assistance, and of generating states with maximal bipartite entanglement. We prove an upper bound for the concurrence of assistance. We consider dynamics of spin-1/2 systems that model qubits, with different couplings and possible presence of magnetic field, to investigate the appearance of the discussed entanglement properties. We find that states with maximal bipartite entanglement can be generated by an isotropic XY Hamiltonian, and their generation can be controlled by the initial state of one of the spins. The same Hamiltonian is capable of creating states with high concurrence of assistance from a suitably chosen initial state. We show that the production of graph states using the Ising Hamiltonian is controllable via a single-qubit rotation of one spin-1/2 subsystem in the initial multiqubit state."@en . . . "Koniorczyk, Matyas" . "Direct versus measurement-assisted bipartite entanglement in multiqubit systems and their dynamical generation in spin systems" . "14330" . "Physical Review A" . "Bu\u017Eek, Vladim\u00EDr" . . "Vol. 72" . "RIV/00216224:14330/05:00013054" . "1"^^ . . . "No. 2" . . "Direct versus measurement-assisted bipartite entanglement in multiqubit systems and their dynamical generation in spin systems" . "3"^^ . "P(GA201/04/1153), Z(MSM0021622419)" . . . "1050-2947" . "We consider multiqubit systems and relate quantitatively the problems of generating cluster states with high values of concurrence of assistance, and of generating states with maximal bipartite entanglement. We prove an upper bound for the concurrence of assistance. We consider dynamics of spin-1/2 systems that model qubits, with different couplings and possible presence of magnetic field, to investigate the appearance of the discussed entanglement properties. We find that states with maximal bipartite entanglement can be generated by an isotropic XY Hamiltonian, and their generation can be controlled by the initial state of one of the spins. The same Hamiltonian is capable of creating states with high concurrence of assistance from a suitably chosen initial state. We show that the production of graph states using the Ising Hamiltonian is controllable via a single-qubit rotation of one spin-1/2 subsystem in the initial multiqubit state." . "RIV/00216224:14330/05:00013054!RIV10-GA0-14330___" . "Direct versus measurement-assisted bipartite entanglement in multiqubit systems and their dynamical generation in spin systems"@en . "[184CA134A130]" .