2017/12/31 by Christie Chiu, Christie S. Chiu, Geoffrey Ji +3 · 2 citations
Physics and Astronomy · #Antiferromagnetism #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Fermion #Ground state #Hubbard model #Ising model #Monte Carlo method #Mott insulator #Physics #Physics of Superconductivity and Magnetism #Quantum #Quantum Monte Carlo #Quantum many-body systems #Quantum mechanics #Square lattice #Superconductivity #Ultracold atom #cond-mat.quant-gas
paper · pdf · doi:10.1103/physrevlett.120.243201
published as Phys. Rev. Lett. 120, 243201 (2018) · 6+4 pages, 4+4 figures
arxiv created 2018/06/14 · openalex publication_date 2018/06/14 · arxiv updated 2018/06/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.