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Quantum steerability based on jointly measurability
Zhi-Hua Chen, Xiangjun Ye and Shao-Ming FeiAbstract
Lying in between entanglement and Bell nonlocality, the Einstein-Podolsky-Rosen (EPR) steering has received increasing attention in recent years. To characterize the EPR-steering, many criteria have been proposed and experimentally implemented. Nevertheless, only a few results are given to quantify the steerability with analytical results.
In this work, we propose a method to quantify the steerability for two-qubit quantum states in the two-setting EPR-steering senario, by using the connection between joint measurability and the steerability.
We derive the analytical formula of the steerability for a class of X-states. The sufficient and necessary conditions for two-setting EPR-steering are presented.
Based on these results, a class of asymmetric states: one-way steerable states are obtained.
- Received:
- 16.01.18
- Published:
- 22.01.18