论文标题
单向爱因斯坦 - 波多尔斯基 - 罗森转向的可靠实验认证
Reliable experimental certification of one-way Einstein-Podolsky-Rosen steering
论文作者
论文摘要
量子转向是一种最近定义的量子相关形式，位于量子力学的核心。在与其他类型的量子相关性的差异中，量子转向本质上是不对称的，这意味着它可以沿一个方向表现出来，但不能朝相反的方向表现出来。在几个实验中已经证明了这种被称为单向转向的相当特殊的现象，但仍然存在微妙的。实际上，直到最近的结论性实验都被证明是模棱两可的，然而，这至关重要的是使用高维嵌入以解决假设。这留下了一个问题，是否可以在真正的双Qubit系统中可靠地证明单向转向现象。在这里，我们报告了一个实验性的证明，该证明是针对两个Qubit State家族的单向转向。我们的实验设置和结果因此解决了先前实验中的保真度假设引起的微妙之处，而无需更高的维嵌入。此外，我们的工作提供了一种通用方法，可以表征通用两数分状态的单向转向现象。
Quantum steering is a recently-defined form of quantum correlation which lies at the heart of quantum mechanics. In difference from other types of quantum correlations, quantum steering is inherently asymmetric, which implies that it could manifest in one direction but not in the opposite direction. This rather peculiar phenomenon, known as one-way steering, have been demonstrated in several experiments, but subtlety remains. In fact all experiments were shown to be ambiguous until a very recent conclusive one, which however made a crucial use of a high dimensional embedding to get around assumptions. This leaves the question open whether the one-way steering phenomenon can be reliably demonstrated in the genuine two-qubit system. Here, we report such an experimental demonstration of one-way steering for a family of two-qubit states. Our experimental setup and results thus resolve the subtlety caused by fidelity assumption in previous experiments without the need of higher dimensional embedding. Moreover, our work provides a universal method to characterize one-way steering phenomenon for generic two-qubit states.
