Integrated Quantum Optics Group, Applied Physics, University of Paderborn, 33098 Paderborn, Germany.
Phys Rev Lett. 2019 Feb 8;122(5):053602. doi: 10.1103/PhysRevLett.122.053602.
We report on the first experimental reconstruction of an entanglement quasiprobability. In contrast to related techniques, the negativities in our distributions are a necessary and sufficient identifier of separability and entanglement and enable a full characterization of the quantum state. A reconstruction algorithm is developed, a polarization Bell state is prepared, and its entanglement is certified based on the reconstructed entanglement quasiprobabilities, with a high significance and without correcting for imperfections.
我们报告了第一个纠缠拟概率的实验重建。与相关技术相比，我们分布中的负性是可分离性和纠缠的必要且充分的标识符，并能够对量子态进行全面描述。我们开发了一种重建算法，制备了极化贝尔态，并基于重建的纠缠拟概率来证明其纠缠，具有高显著性，且无需对不完美性进行修正。
