Generation of frequency entanglement by rotating Doppler effect

• URL: http://arxiv.org/abs/2506.09488v1
• Date: Wed, 11 Jun 2025 08:01:15 GMT
• Title: Generation of frequency entanglement by rotating Doppler effect
• Authors: Bolong Yi, Ling Chen, Baocheng Zhang,
• Abstract summary: 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.<n>This allows the arbitrary modification of frequency entangled photons in a wide frequency range at room temperature.
• Score: 5.336192032325057
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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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