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arXiv · 2508.11962

Coherence and decoherence in generalized and noisy Shor's algorithm

Linlin Ye·Zhaoqi Wu·Nanrun Zhou
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Abstract

Quantum coherence constitutes a fundamental physical mechanism essential to the study of quantum algorithms. We study the coherence and decoherence in generalized Shor's algorithm where the register $A$ is initialized in arbitrary pure state, or the combined register $AB$ is initialized in any pseudo-pure state, which encompasses the standard Shor's algorithm as a special case. We derive both the lower and upper bounds on the performance of the generalized Shor's algorithm, and establish the relation between the probability of calculating $r$ when the register $AB$ is initialized in any pseudo-pure state and the one when the register $A$ initialized in arbitrary pure state. Moreover, we study the coherence and decoherence in noisy Shor's algorithm and give the lower bound of the probability that we can calculate $r$.

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Linlin Ye, Zhaoqi Wu, Nanrun Zhou. 2025-08-16. Coherence and decoherence in generalized and noisy Shor's algorithm. https://arxiv.org/abs/2508.11962

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