CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, Peoples Republic of China.
University of Science and Technology of China, Hefei 230026, People's Republic of China.
Phys Rev Lett. 2018 Aug 3;121(5):050401. doi: 10.1103/PhysRevLett.121.050401.
Quantum resource theories seek to quantify sources of nonclassicality that bestow quantum technologies their operational advantage. Chief among these are studies of quantum correlations and quantum coherence. The former isolates nonclassicality in the correlations between systems, and the latter captures nonclassicality of quantum superpositions within a single physical system. Here, we present a scheme that cyclically interconverts between these resources without loss. The first stage converts coherence present in an input system into correlations with an ancilla. The second stage harnesses these correlations to restore coherence on the input system by measurement of the ancilla. We experimentally demonstrate this interconversion process using linear optics. Our experiment highlights the connection between nonclassicality of correlations and nonclassicality within local quantum systems and provides potential flexibilities in exploiting one resource to perform tasks normally associated with the other.
量子资源理论旨在量化赋予量子技术操作优势的非经典来源。其中主要的研究是对量子相关性和量子相干性的研究。前者分离了系统之间的非经典相关性，后者捕获了单个物理系统中量子叠加的非经典性。在这里，我们提出了一种在不损失的情况下循环转换这些资源的方案。第一阶段将输入系统中存在的相干性转换为与辅助系统的相关性。第二阶段利用这些相关性通过对辅助系统的测量来恢复输入系统的相干性。我们使用线性光学实验证明了这个转换过程。我们的实验强调了相关性的非经典性和局域量子系统内部的非经典性之间的联系，并为利用一种资源来执行通常与另一种资源相关联的任务提供了潜在的灵活性。
