CAJ | 학술논문

利用量子通道估计方法研究了纯退相位通道下，2个相互作用量子比特系统退相干率的量子Fisher信息的动力学演化。数值计算表明：量子Fisher信息总是先从0增加到某一最大值后迅速衰减，最后又减小到0；退相干率越大，导致量子Fisher信息越小和衰减到0的时间也越短；提高初始输入态的纠缠不能使最大量子Fisher信息得到提升。
이용양자통도고계방법연구료순퇴상위통도하，2개상호작용양자비특계통퇴상간솔적양자Fisher신식적동역학연화。수치계산표명：양자Fisher신식총시선종0증가도모일최대치후신속쇠감，최후우감소도0；퇴상간솔월대，도치양자Fisher신식월소화쇠감도0적시간야월단；제고초시수입태적규전불능사최대양자Fisher신식득도제승。
Using the quantum channel estimation method, studies the dynamical evolution of quantum Fisher information(QFI) with respect to decoherent rate of two interacting qubits under pure dephasing channel. Numerical results show that the quantum Fisher information always increases from zero to a maximum value before rapidly decays, finally decays to zero, a larger decoherence rate leads to smaller quantum Fisher information and shorter decay time to zero, and also show that the maximum quantum Fisher information is not enhanced by promoting the degree of entanglement in the initial input state.