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arXiv · 2506.09488

Generation of frequency entanglement by rotating Doppler effect

Bolong Yi·Ling Chen·Baocheng Zhang
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Abstract

We propose a method to generate the frequency entanglement, allowing a continuous generation of entangled two-photon states in a hybrid degree of freedom by post-manipulation. Our method is based on type-II spontaneous parametric down-conversion in a nonlinear crystal and the rotation Doppler effect by rotating the q-plates, without preset discrete frequency entanglement. This allows the arbitrary modification of frequency entangled photons in a wide frequency range at room temperature, offering enhanced flexibility for quantum information tasks and quantum metrology. We also analyze the entanglement state by a combined calculation for the joint spectrum and Hong-Ou-Mandel interference of the two photons, which can be used to reconstruct a restricted density matrix in the frequency space.

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Bolong Yi, Ling Chen, Baocheng Zhang. 2025-06-11. Generation of frequency entanglement by rotating Doppler effect. https://doi.org/10.1088/1361-6455/addf9c

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