Geometric steering criterion for two-qubit states
| Autor: | Bai-Chu Yu, Guang-Can Guo, Zhih-Ahn Jia, Yu-Chun Wu |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Quantum Physics
FOS: Physical sciences State (functional analysis) Construct (python library) Characterization (mathematics) 01 natural sciences 010309 optics Control theory Qubit 0103 physical sciences Assemblage (archaeology) Statistical physics Projective test Quantum Physics (quant-ph) 010306 general physics Mathematics |
| Zdroj: | Physical Review A. 97 |
| ISSN: | 2469-9934 2469-9926 |
| DOI: | 10.1103/physreva.97.012130 |
| Popis: | According to the geometric characterization of measurement assemblages and local hidden state (LHS) models, we propose a steering criterion which is both necessary and sufficient for two-qubit states under arbitrary measurement sets. A quantity is introduced to describe the required local resources to reconstruct a measurement assemblage for two-qubit states. We show that the quantity can be regarded as a quantification of steerability and be used to find out optimal LHS models. Finally we propose a method to generate unsteerable states, and construct some two-qubit states which are entangled but unsteerable under all projective measurements. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|