Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
Phys Rev Lett. 2018 Jun 15;120(24):243201. doi: 10.1103/PhysRevLett.120.243201.
Accessing new regimes in quantum simulation requires the development of new techniques for quantum state preparation. We demonstrate the quantum state engineering of a strongly correlated many-body state of the two-component repulsive Fermi-Hubbard model on a square lattice. Our scheme makes use of an ultralow entropy doublon band insulator created through entropy redistribution. After isolating the band insulator, we change the underlying potential to expand it into a half-filled system. The final many-body state realized shows strong antiferromagnetic correlations and a temperature below the exchange energy. We observe an increase in entropy, which we find is likely caused by the many-body physics in the last step of the scheme. This technique is promising for low-temperature studies of cold-atom-based lattice models.
在量子模拟中访问新的体系需要开发新的量子态制备技术。我们在正方形晶格上展示了双分量排斥费米-哈伯德模型的强关联多体态的量子态工程。我们的方案利用通过熵重新分配产生的超低熵双电子带绝缘体态。隔离带绝缘体后，我们改变基础势以将其扩展到半充满系统。实现的最终多体态表现出强烈的反铁磁关联和低于交换能的温度。我们观察到熵的增加，我们发现这可能是由于方案最后一步的多体物理造成的。该技术有望用于低温下基于冷原子的晶格模型研究。
