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@article{349934,
author = {Bůžek, Vladimír and Hillery, M.},
article_location = {USA},
article_number = {05},
keywords = {CLONING; STATES; INFORMATION; ENSEMBLES},
language = {eng},
issn = {1050-2947},
journal = {Physical Review A},
title = {Quantum disentanglers},
volume = {62},
year = {2000}
}
TY - JOUR
ID - 349934
AU - Bůžek, Vladimír - Hillery, M.
PY - 2000
TI - Quantum disentanglers
JF - Physical Review A
VL - 62
IS - 05
SP - N/A
EP - N/A
PB - American Physical Society
SN - 10502947
KW - CLONING
KW - STATES
KW - INFORMATION
KW - ENSEMBLES
N2 - It is not possible to disentangle a qubit in an unknown state \ psi > from a set of N-1 ancilla qubits prepared in a specific reference state \0 >. That is, it is not possible to perfectly perform the transformation (\ psi ,0,...,0 > + \0,psi,...,0 > +...+\0.0,...,0 psi >) --> \0,...,0 > circle times \ psi >. The question is then how well we can do? We consider a number of different methods of extracting an unknown state from an entangled state formed from that qubit and a set of ancilla qubits in a known state. Measuring the whole system is, as expected, the least effective method. We present various quantum ''devices'' which disentangle the unknown qubit from the set of ancilla qubits. In particular, we present the optimal universal disentangler which disentangles the unknown qubit with a fidelity that does not depend on the state of the qubit, and a probabilistic disentangler which performs the perfect disentangling transformation, but with a probability less than 1.
ER -
BŮŽEK, Vladimír a M. HILLERY. Quantum disentanglers. \textit{Physical Review A}. USA: American Physical Society, 2000, roč.~62, č.~05, s.~N/A, N/A. ISSN~1050-2947.
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