量子失协在量子通信中的作用
量子物理
2011-07-07 v1
摘要
量子失协的正性被证明等价于冯·诺依曼熵的强次可加性。这导致了量子信息理论中的母协议[A. Abeyesinghe, I. Devetak, P. Hayden, and A. Winter, Proc. R. Soc. A 465, 2537, (2009)]与量子失协之间的联系。我们利用这一点表明，量子失协是母协议性能中相干性的一种度量。由于母协议是一类重要问题（那些双方向、单向且无记忆的问题）的统一，我们证明量子失协是这些协议中相干性的一种度量。我们的工作推广了先前基于量子态合并给出的量子失协的操作性解释[V. Madhok and A. Datta, Phys. Rev. A 83, 032323, (2011)]。
引用
@article{arxiv.1107.0994,
title = {Role of quantum discord in quantum communication},
author = {Vaibhav Madhok and Animesh Datta},
journal= {arXiv preprint arXiv:1107.0994},
year = {2011}
}
备注
To be published in Springer's Lecture Notes in Computer Science as proceedings of The sixth Conference on the Theory of Quantum Computation, Communication and Cryptography (TQC,2011) under the title `Quantum discord in quantum information theory - From strong subadditivity to the Mother protocol'