论文标题
揭示了固有的量子干扰和狄拉克粒子的纠缠
Revealing inherent quantum interference and entanglement of a Dirac particle
论文作者
论文摘要
尽管最初在相对论量子力学中预测，但Zitterbewegung也可以出现在某些经典系统中，这导致了一个重要的问题，即Dirac颗粒的Zitterbewegung是否受到没有经典类似物的更根本和普遍的干扰行为的限制。在这里，我们在相位空间中揭示了这种干扰模式，该模式是基于Zitterbewegung的基础，但其非经典性由相位空间的准方法分布和相关的伪单胞素纠缠所表现出来。我们通过数值模拟和片上实验证实了这一发现，其中超导量子量子和量化的微波场分别模仿了狄拉克粒子的内部和外部自由度。测得的准方法负性与数值模拟非常吻合。除了至关重要之外，所证明的非经典作用在量子技术中也有用。
Although originally predicted in relativistic quantum mechanics, Zitterbewegung can also appear in some classical systems, which leads to the important question of whether Zitterbewegung of Dirac particles is underlain by a more fundamental and universal interference behavior without classical analogs. We here reveal such an interference pattern in phase space, which underlies but goes beyond Zitterbewegung, and whose nonclassicality is manifested by the negativity of the phase space quasiprobability distribution, and the associated pseudospin-momentum entanglement. We confirm this discovery by numerical simulation and an on-chip experiment, where a superconducting qubit and a quantized microwave field respectively emulate the internal and external degrees of freedom of a Dirac particle. The measured quasiprobability negativities agree well with the numerical simulation. Besides being of fundamental importance, the demonstrated nonclassical effects are useful in quantum technology.
