Physics – Quantum Physics
Scientific paper
2005-06-20
Phys. Rev. A 72, 062329 (2005)
Physics
Quantum Physics
6 pages, 3 figures. to appear in PRA
Scientific paper
10.1103/PhysRevA.72.062329
We study the quantum state transfer (QST) of a class of tight-bonding Bloch electron systems with mirror symmetry by considering the mode entanglement. Some rigorous results are obtained to reveal the intrinsic relationship between the fidelity of QST and the mirror mode concurrence (MMC), which is defined to measure the mode entanglement with a certain spatial symmetry and is just the overlap of a proper wave function with its mirror image. A complementarity is discovered as the maximum fidelity is accompanied by a minimum of MMC. And at the instant, which is just half of the characteristic time required to accomplish a perfect QST, the MMC can reach its maximum value one. A large class of perfect QST models with a certain spectrum structure are discovered to support our analytical results.
Li Ying
Li Yong
Qian Xiao-Feng
Song Zhankai
Sun Chang-Pu
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