Quantum steering witness for quantum key distribution
邱靖益/Ching-Yi Chiu1*, 李哲明/Che-Ming Li1,4, 陳岳男/Yueh-Nan Chen2,3, Neil Lambert4, Franco Nori5,4
1Engineering Sciences, National Cheng Kung University, Tainan, Taiwan
2Physics, National Cheng Kung University, Tainan, Taiwan
3National Center for Theoretical Sciences, National Cheng Kung University, Tainan, Taiwan
4Center for Emergent Matter Science, RIKEN, Wako-shi, Japan
5Physics, University of Michigan, Michigan, United States of America
* presenting author:邱靖益, email:chiujinyi@gmail.com
The concept of steering was originated from Schrodinger in response to the EPR paradox. It describes that the state of one particle of an entangled pair can be decided remotely by measuring another pair. We propose a new concept of steering for single quantum d-level systems which is based on realism and devise several quantum witness which are applicable for both single-system steering and EPR steering. These witnesses are useful in quantum information processing as a secure criterion against coherent attack and cloning-based attack when implementing quantum key distribution.

Keywords: quantum key distribution, Quantum steering