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Main Authors: Dhamapurkar, Shyam, Deng, Xiu-Hao
Format: Preprint
Published: 2023
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Online Access:https://arxiv.org/abs/2309.16352
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author Dhamapurkar, Shyam
Deng, Xiu-Hao
author_facet Dhamapurkar, Shyam
Deng, Xiu-Hao
contents This work focuses on the quantum mixing time, which is crucial for efficient quantum sampling and algorithm performance. We extend Richter's previous analysis of continuous time quantum walks on the periodic lattice $\mathbb{Z}_{n_1}\times \mathbb{Z}_{n_2}\times \dots \times \mathbb{Z}_{n_d}$, allowing for non-identical dimensions $n_i$. We present two quantum walks that achieve faster mixing compared to classical random walks. The first is a coordinate-wise quantum walk with a mixing time of $O\left(\left(\sum{i=1}^{d} n_i \right) \log{(d/ε)}\right)$ and $O(d \log(d/ε))$ measurements. The second is a continuous-time quantum walk with $O(\log(1/ε))$ measurements, conjectured to have a mixing time of $O\left(\sum_{i=1}^d n_i(\log(n_1))^2 \log(1/ε)\right)$. Our results demonstrate a quadratic speedup over classical mixing times on the generalized periodic lattice. We provide analytical evidence and numerical simulations supporting the conjectured faster mixing time. The ultimate goal is to prove the general conjecture for quantum walks on regular graphs.
format Preprint
id arxiv_https___arxiv_org_abs_2309_16352
institution arXiv
publishDate 2023
record_format arxiv
spellingShingle Quantum walk mixing is faster than classical on periodic lattices
Dhamapurkar, Shyam
Deng, Xiu-Hao
Quantum Physics
This work focuses on the quantum mixing time, which is crucial for efficient quantum sampling and algorithm performance. We extend Richter's previous analysis of continuous time quantum walks on the periodic lattice $\mathbb{Z}_{n_1}\times \mathbb{Z}_{n_2}\times \dots \times \mathbb{Z}_{n_d}$, allowing for non-identical dimensions $n_i$. We present two quantum walks that achieve faster mixing compared to classical random walks. The first is a coordinate-wise quantum walk with a mixing time of $O\left(\left(\sum{i=1}^{d} n_i \right) \log{(d/ε)}\right)$ and $O(d \log(d/ε))$ measurements. The second is a continuous-time quantum walk with $O(\log(1/ε))$ measurements, conjectured to have a mixing time of $O\left(\sum_{i=1}^d n_i(\log(n_1))^2 \log(1/ε)\right)$. Our results demonstrate a quadratic speedup over classical mixing times on the generalized periodic lattice. We provide analytical evidence and numerical simulations supporting the conjectured faster mixing time. The ultimate goal is to prove the general conjecture for quantum walks on regular graphs.
title Quantum walk mixing is faster than classical on periodic lattices
topic Quantum Physics
url https://arxiv.org/abs/2309.16352