【摘要】 量子纠缠是量子信息和量子计算的关键资源,研究初态为混合态的电荷量子比特与单模量子化光场之间的纠缠,根据Peres的可分离态的密度矩阵部分转置正定(PPT)判据,测量系统的纠缠并观察初态的混合度λ和失谐量Δ对系统纠缠随时间演化的影响。更多还原

【Abstract】 Quantum entanglement is a key resource in quantum information processing and quantum calculation.Taking the initial mixed state of a charge qubit and a single-mode quantum field into account,we compute the entanglement degree for the detuned system between them by the Peres’ PPT(positive partial transposition) criterion,and investigate the function of the mixture λ and the detuning quantity Δ to control the entanglement.更多还原