论文标题
通过相阻尼通道模拟弱测量的效果，并确定核磁共振中的两分相关性的不同测量值
Simulating the effect of weak measurements by a phase damping channel and determining different measures of bipartite correlations in nuclear magnetic resonance
论文作者
论文摘要
量子不和谐是基于局部投影测量值的措施，该测量值捕获了可能不会被纠缠完全捕获的量子相关性。测量过程的变化是通过用弱正算子值测量（POVM）替换排名一号投影仪来实现的，使人们可以定义量子不和谐的弱变体。在这项工作中，我们通过实验模拟了弱POVM对核磁共振量子信息处理器的影响。所研究的两量量系统是一个三量Qubit System的一部分，其中一个Qubits用作实现相阻尼通道的辅助系统。弱POVM的强度通过改变相阻尼通道的强度来控制。我们在实验上观察到两个量子不和谐的弱变异，即超级量子不一致和弱量子不一致，在两Q量的Werner和Bell-Diagonal状态下。研究状态的最终动力学作为测量强度的函数。
Quantum discord is a measure based on local projective measurements which captures quantum correlations that may not be fully captured by entanglement. A change in the measurement process, achieved by replacing rank-one projectors with a weak positive operator-valued measure (POVM), allows one to define weak variants of quantum discord. In this work, we experimentally simulate the effect of a weak POVM on a nuclear magnetic resonance quantum information processor. The two-qubit system under investigation is part of a three-qubit system, where one of the qubits is used as an ancillary to implement the phase damping channel. The strength of the weak POVM is controlled by varying the strength of the phase damping channel. We experimentally observed two weak variants of quantum discord namely, super quantum discord and weak quantum discord, in two-qubit Werner and Bell-diagonal states. The resultant dynamics of the states is investigated as a function of the measurement strength.
