Optimizing Site Order in DMRG for Improved Accuracy
Published:Dec 26, 2025 12:59
•1 min read
•ArXiv
Analysis
This paper addresses a crucial aspect of DMRG, a powerful method for simulating quantum systems: the impact of site ordering on accuracy. By introducing and improving an algorithm for optimizing site order through local rearrangements, the authors demonstrate significant improvements in ground-state energy calculations, particularly by expanding the rearrangement range. This work is important because it offers a practical way to enhance the performance of DMRG, making it more reliable for complex quantum simulations.
Key Takeaways
- •Site ordering significantly impacts the accuracy of DMRG calculations.
- •The paper proposes and improves an algorithm for optimizing site order via local rearrangements.
- •Increasing the rearrangement range (e.g., from 2 to 3 sites) dramatically improves accuracy.
- •The method can be used as a preprocessing step for MPS-based calculations.
Reference
“Increasing the rearrangement range from two to three sites reduces the average relative error in the ground-state energy by 65% to 94% in the cases we tested.”