...
首页> 外文期刊>Journal of Experimental and Theoretical Physics >Exact, complete, and universal continuous-time worldline Monte Carlo approach to the statistics of discrete quantum systems
【24h】

Exact, complete, and universal continuous-time worldline Monte Carlo approach to the statistics of discrete quantum systems

机译:精确,完整且通用的连续时间世界线蒙特卡洛方法用于离散量子系统的统计

获取原文
获取原文并翻译 | 示例
           

摘要

We show how the worldline quantum Monte Carlo procedure, which usually relies on an artificial time discretization, can be formulated directly in continuous time, rendering the scheme exact. For an arbitrary system with discrete Hilbert space, none of the configuration update procedures contain small parameters. We find that the most effective update strategy involves the motion of worldline discontinuities (both in space and time), i.e., the evaluation of the Green's function. Being based on local updates only, our method nevertheless allows one to work with the grand canonical ensemble and nonzero winding numbers, and to calculate any dynamical correlation function as easily as expectation values of, e.g., total energy. The principles found for the update in continuous time generalize to any continuous variables in the space of discrete virtual transitions, and in principle also make it possible to simulate continuous systems exactly.
机译:我们展示了通常依靠人工时间离散化的世界级量子蒙特卡罗程序如何可以在连续时间内直接制定,从而使方案精确。对于具有离散希尔伯特空间的任意系统,没有任何配置更新过程包含较小的参数。我们发现最有效的更新策略涉及世界线不连续性的运动(在空间和时间上),即对格林功能的评估。尽管如此,我们的方法仅基于本地更新,因此允许人们使用大正则合奏和非零绕组数,并像期望值(例如总能量)一样容易地计算任何动态相关函数。连续时间更新的原理可以推广到离散虚拟过渡空间中的任何连续变量,并且原则上也可以精确地模拟连续系统。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号