Detection and quantification of entanglement with measurement-device-independent and universal entanglement witness

Ke Zhi-Jin^{1, 2}, Wang Yi-Tao^{1, 2}, Yu Shang^{1, 2}, Liu Wei^{1, 2}, Meng Yu^{1, 2}, Li Zhi-Peng^{1, 2}, Wang Hang^{1, 2}, Li Qiang^{1, 2}, Xu Jin-Shi^{1, 2}, Xiao Ya³, Tang Jian-Shun^{1, 2, †}, Li Chuan-Feng^{1, 2, ‡}, Guo Guang-Can^{1, 2}

Concurrence and EWM for a series of asymmetric states. States are defined in Eq. (7), the two parameters (p,θ) are united as x, which is p = 0.01x and θ = 0.01xπ. EWM of a state is less than or equal to its concurrence.