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Письма в Журнал экспериментальной и теоретической физики, 2012, том 96, выпуск 7, страницы 534–538
(Mi jetpl3253)
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КВАНТОВАЯ ИНФОРМАТИКА
Scheme for realizing entanglement concentration via
generalized measurements
Ch. Q. Dua, M. Yanga, Y. Lua, Zh.-L. Caob a Key Laboratory of Opto-electronic Information Acquisition and Manipulation, Ministry of Education,
School of Physics {\&} Material Science, Anhui University
b School of Electronic Information Engineering, Hefei Normal University,
Аннотация:
How to concentrate non-maximally entangled states for
quantum communication is a fundamental problem in quantum
information. In this paper, we will
apply generalized measurements to entanglement concentration of
known non-maximally entangled pure states in arbitrary dimensional
system. How to design the generalized measurements for the
unambiguous discrimination of linearly independent non-orthogonal
states is crucial for the concentration of the known non-maximally
entangled states. The result shows that, any known non-maximally
entangled pure state (for arbitrary dimensional system) can be transformed
to the maximally entangled state only by introducing a qubit as
ancilla and a joint unitary transformation operation on one of the
entangled particles and the ancilla. In addition, because the less entangled state of each
fail round will be re-concentrated too,
the entanglement waste during the concentration process will be greatly reduced.
Поступила в редакцию: 14.02.2012 Исправленный вариант: 07.08.2012
Образец цитирования:
Ch. Q. Du, M. Yang, Y. Lu, Zh.-L. Cao, “Scheme for realizing entanglement concentration via
generalized measurements”, Письма в ЖЭТФ, 96:7 (2012), 534–538; JETP Letters, 96:7 (2012), 486–490
Образцы ссылок на эту страницу:
https://www.mathnet.ru/rus/jetpl3253 https://www.mathnet.ru/rus/jetpl/v96/i7/p534
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