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@article{349853, author = {Bůžek, Vladimír and Hillery, M.}, article_location = {USA}, article_number = {02}, keywords = {STATES; CLONING; SEPARABILITY; INFORMATION; ENSEMBLES}, language = {eng}, issn = {1050-2947}, journal = {Physical Review A}, title = {Optimal manipulations with qubits: Universal quantum entanglers}, url = {http://publish.aps.org/abstract/PRA/v62/e022303}, volume = {62}, year = {2000} }
TY - JOUR ID - 349853 AU - Bůžek, Vladimír - Hillery, M. PY - 2000 TI - Optimal manipulations with qubits: Universal quantum entanglers JF - Physical Review A VL - 62 IS - 02 SP - 2303 EP - 2303 PB - American Physical Society SN - 10502947 KW - STATES KW - CLONING KW - SEPARABILITY KW - INFORMATION KW - ENSEMBLES UR - http://publish.aps.org/abstract/PRA/v62/e022303 N2 - We analyze various scenarios for entangling two initially unentangled qubits. In particular, we propose an optimal universal entangler that entangles a qubit in unknown state \psi] with a qubit in a reference (known) state \0]. That is, our entangler generates the output state that is as close as possible to the pure (symmetrized) state (\psi]\0]+\0]\psi]). The most attractive feature of this entangling machine, is that the fidelity of its performance (i.e., the distance between the output and the ideally entangled-symmetrized state) does not depend on the input and takes the constant value F = (9 + 3 root 2)/14 similar or equal to 0.946. We also analyze how to optimally generate from a single qubit initially prepared in an unknown state \psi]) a two qubit entangled system, which is as close as possible to a Bell state (\psi]\psi(perpendicular to)]+\psi(perpendicular to)]\psi]), where [psi\psi(perpendicular to)] = 0. ER -
BŮŽEK, Vladimír a M. HILLERY. Optimal manipulations with qubits: Universal quantum entanglers. \textit{Physical Review A}. USA: American Physical Society, 2000, roč.~62, č.~02, s.~2303-2313. ISSN~1050-2947.
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