论文标题
未检测到的光子的量子层析成像
Quantum state tomography of undetected photons
论文作者
论文摘要
量子状态的测量是量子力学中最重要的问题之一。我们介绍了一种量子状态断层扫描技术，其中重建了量子状态，而量子位仍未被发现。关键成分是：（i）使用额外的量子，（ii）使用路径身份将未检测到的量子置于已知参考状态，以及（iii）测量附加量子以重建未检测到的量子态状态。我们从理论上建立并在实验上证明了光子极化状态的方法。我们方法的基础原理也可以应用于光子以外的量子实体。
The measurement of quantum states is one of the most important problems in quantum mechanics. We introduce a quantum state tomography technique in which the state of a qubit is reconstructed, while the qubit remains undetected. The key ingredients are: (i) employing an additional qubit, (ii) aligning the undetected qubit with a known reference state by using path identity, and (iii) measuring the additional qubit to reconstruct the undetected qubit state. We theoretically establish and experimentally demonstrate the method with photonic polarization states. The principle underlying our method could also be applied to quantum entities other than photons.
