Optimal quantum parameter estimation of two-qutrit Heisenberg <i>XY</i> chain under decoherence

Optimal quantum parameter estimation of two-qutrit Heisenberg XY chain under decoherence

Yang Hong-ying¹, Zheng Qiang^{2, †}, Zhi Qi-jun^{1, ‡}

(color online) The variations of the QFI at time t = 10 and the negativity entanglement N of the input state with respect to parameter α. The other parameters are and .