论文标题
超导量子的测量较弱
Weak Measurement of Superconducting Qubit Reconciles Incompatible Operators
论文作者
论文摘要
传统的不确定性关系决定了不兼容的投射量子测量中的噪声最少。但是，并非所有的测量都是投影的。弱测量方法是最低侵入性的方法，用于获取部分状态信息而无需投影。最近，显示弱测量值遵守熵的不确定性关系。我们通过实验测试了这种熵不确定性关系，并通过超导型转导量子的强和弱测量值进行了测试。我们发现，通过在状态下的背相提并论可以调和两个强尺寸的不兼容性。从数学上讲，弱价值（预选和后选择的期望值）降低了不确定性结合。因此，我们为弱价值的物理解释提供了实验支持，这是弱测量能力调和不相容操作能力的决定因素。
Traditional uncertainty relations dictate a minimal amount of noise in incompatible projective quantum measurements. However, not all measurements are projective. Weak measurements are minimally invasive methods for obtaining partial state information without projection. Recently, weak measurements were shown to obey an uncertainty relation cast in terms of entropies. We experimentally test this entropic uncertainty relation with strong and weak measurements of a superconducting transmon qubit. A weak measurement, we find, can reconcile two strong measurements' incompatibility, via backaction on the state. Mathematically, a weak value -- a preselected and postselected expectation value -- lowers the uncertainty bound. Hence we provide experimental support for the physical interpretation of the weak value as a determinant of a weak measurement's ability to reconcile incompatible operations.
