An important property of entanglement: pairwise entanglement that can only be transferred by an entangled pair
Xi Xiao-Qiang(惠小强)a)b)† and Liu Wu-Ming(刘伍明)b)
a Department of Applied Mathematics and Physics, Xi'an Institute of Posts and Telecommunications, Xi'an 710061, China; b Beijing National Laboratory for Condensed Matter Physics, Institute of Physics,Chinese Academy of Sciences, Beijing 100080, China
Abstract Based on the calculation of all the pairwise entanglements in the $n$ ($ n \leq 6$)-qubit Heisenberg XX open chain with system impurity, we find an important result: pairwise entanglement can only be transferred by an entangled pair. The non-nearest pairwise entanglements will have the possibility to exist as long as there has been even number of qubits in their middle. This point indicates that we can obtain longer distance entanglement in a solid system.
Received: 11 September 2006
Revised: 25 January 2007
Accepted manuscript online:
(Entanglement measures, witnesses, and other characterizations)
Fund: Project supported
in part by the National Natural Science Foundation of China
(Grant No 10547008), and the Foundation of Xi'an Institute of
Posts and Telecommunications, China (Grant No 105-0414).
Cite this article:
Xi Xiao-Qiang(惠小强) and Liu Wu-Ming(刘伍明) An important property of entanglement: pairwise entanglement that can only be transferred by an entangled pair 2007 Chinese Physics 16 1858
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
