论文标题
通过一般测量过程创建量子相干性
Creation of quantum coherence with general measurement processes
论文作者
论文摘要
量子测量不仅可以破坏连贯性，而且可以创建它。在这里，我们估算最大的连贯性，可以在完整的非选择性测量过程中创建。为了进行分析，我们考虑投影和POVM测量。根据我们的观察结果，我们将测量过程描述为两类，即，测量值具有诱导连贯性和没有这种能力的能力。我们的发现还表明，在量子系统上作用的测量中存在的POVM元素越多，它的连贯性创造能力就越少。我们还介绍了POVM中原始连贯性的概念，有助于创建量子相干性。最后，我们发现连贯创造，系统和设备之间的纠缠产生与系统混合性之间的权衡关系。
Quantum measurement not only can destroy coherence but also can create it. Here, we estimate the maximum amount of coherence, one can create under a complete non-selective measurement process. For our analysis, we consider projective as well as POVM measurements. Based on our observations, we characterize the measurement processes into two categories, namely, the measurements with the ability to induce coherence and the ones without this ability. Our findings also suggest that the more POVM elements present in a measurement that acts on the quantum system, the less will be its coherence creating ability. We also introduce the notion of raw coherence in the POVMs that helps to create quantum coherence. Finally, we find a trade-off relation between the coherence creation, entanglement generation between system and apparatus, and the mixedness of the system in a general measurement setup.
