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arXiv:2602.12156

Deterministic Generation of Arbitrary Fock States via Resonant Subspace Engineering

Shan Jin, Ming Li, Weizhou Cai, Zi-Jie Chen, Yifang Xu, Yilong Zhou, Hongwei Huang, Yunlai Zhu, Ziyue Hua, Guang-Can Guo, Luyan Sun, Xiaoting Wang, Chang-Ling Zou

quant-phSubmitted Feb 12, 2026• Announced Feb 13, 2026• 0 citations
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Abstract

Deterministic preparation of high-excitation Fock states is a central challenge in bosonic quantum information, with control complexity that generically explodes as the Hilbert space dimension grows. Here we introduce resonant subspace engineering (RSE), a protocol that analytically confines the infinite-dimensional bosonic dynamics to a two-dimensional invariant subspace spanned by an initial coherent state and the target state. State transfer then reduces to a geodesic rotation on a synthetic Bloch sphere, governed by resonance and phase-matching conditions we derive in closed form. For single Fock states, RSE achieves $O(n^{1/4})$ scaling in both evolution time and gate depth, showing a fundamental improvement over existing deterministic schemes. The construction generalizes to $K$-component superpositions via a $(K{+}1)$-dimensional invariant subspace with full $\mathrm{SU}(K{+}1)$ controllability, requiring only 3-5 iterations of operations for superpositions spanning photon numbers 70--100. RSE provides a scalable and analytically transparent framework for large-scale bosonic state engineering and gate synthesis across single- and multimode platforms.

Comments
7 pages, 3 figures

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