近日，上海交通大学的Emmanouil Grigoriou及其研究团队取得一项新进展。经过不懈努力，他们证实相干对注入是提高多体玻色子模型中超固态序的途径。相关研究成果已于2024年6月18日在国际知名学术期刊《物理评论A》上发表。

以扩展的玻色-哈伯德模型为例，在这项工作中，该研究团队研究了相干对注入的影响，这是一种容易在超导电路阵列中使用的过程。这个过程背后的有趣之处在于，与传统的单一激励注入不同，它可以被精心配置以保持模型底层的U(1)对称性。研究人员的研究结果表明，这种相干对注入过程有利于促进超流体和密度波的有序性，而非形成绝缘或均匀状态，从而为实现晶格超固态开辟了新的途径。

据悉，在过去的几十年里，量子模拟器一直在以前所未有的控制水平探索量子多体物理。到目前为止，主要的焦点是获得与凝聚态模型有关的新的可观测值和动力学条件。然而，量子模拟器的潜力超出了凝聚态物理的传统范围: 基于驱动耗散量子光学平台，量子模拟器允许通常在凝聚态物理中不考虑的过程。这些过程可以以未经探索的方式丰富已建立模型的相图。

附:英文原文

Title: Coherent pair injection as a route towards the enhancement of supersolid order in many-body bosonic models

Author: Emmanouil Grigoriou, Zhiyao Ning, Hang Su, Benjamin Lckler, Ming Li, Yoshitomo Kamiya, Carlos Navarrete-Benlloch

Issue&Volume: 2024/06/18

Abstract: Over the past couple of decades, quantum simulators have been probing quantum many-body physics with unprecedented levels of control. So far, the main focus has been on the access to novel observables and dynamical conditions related to condensed-matter models. However, the potential of quantum simulators goes beyond the traditional scope of condensed-matter physics: Being based on driven-dissipative quantum optical platforms, quantum simulators allow for processes that typically are not considered in condensed-matter physics. These processes can enrich in unexplored ways the phase diagram of well-established models. Taking the extended Bose-Hubbard model as the guiding example, in this work we examine the impact of coherent pair injection, a process readily available in, for example, superconducting circuit arrays. The interest behind this process is that, in contrast to the standard injection of single excitations, it can be configured to preserve the U(1) symmetry underlying the model. We prove that this process favors both superfluid and density-wave order, as opposed to insulation or homogeneous states, thereby providing a route towards the access of lattice supersolidity.

DOI: 10.1103/PhysRevA.109.063324

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.109.063324