Clock Quantum Monte Carlo: an imaginary-time method for real-time quantum dynamics
arXiv:1410.1877 · doi:10.1103/PhysRevA.91.012311
Abstract
In quantum information theory, there is an explicit mapping between general unitary dynamics and Hermitian ground state eigenvalue problems known as the Feynman-Kitaev Clock. A prominent family of methods for the study of quantum ground states are quantum Monte Carlo methods, and recently the full configuration interaction quantum Monte Carlo (FCIQMC) method has demonstrated great promise for practical systems. We combine the Feynman-Kitaev Clock with FCIQMC to formulate a new technique for the study of quantum dynamics problems. Numerical examples using quantum circuits are provided as well as a technique to further mitigate the sign problem through time-dependent basis rotations. Moreover, this method allows one to combine the parallelism of Monte Carlo techniques with the locality of time to yield an effective parallel-in-time simulation technique.
References in corpus (5)
- Computational complexity and fundamental limitations to fermionic quantum Monte Carlo simulations
- Universal computation by multi-particle quantum walk
- The sign problem in full configuration interaction quantum Monte Carlo: Linear and sub-linear representation regimes for the exact wave function
- The effect of quantization on the FCIQMC sign problem
- Feynman's Clock for open quantum systems