Controlling quantum entanglement with classical non-separable light

2025/07/09 by Rafael Barros, Barros, R. F., Junior, A. L. S. Santos +4
Computer Science · Physics and Astronomy · #FOS: Physical sciences #Mechanical and Optical Resonators #Optics (physics.optics) #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum Physics (quant-ph)

paper · pdf · doi:10.48550/arxiv.2507.06462

openalex publication_date 2025/07/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Here we investigate the quantum frequency conversion of entangled photons driven by a classically non-separable laser beam. We show that the frequency conversion dynamics is described by a quantum channel that stems from the classical drive field through the channel-state duality - the quantum channel is dual to the classical coherence matrix of the drive field. This implies that the evolution of entanglement in the conversion process is bound by the classical non-separability of the drive field, a result that we confirm experimentally. Furthermore, we show that the conversion dynamics can be understood as a swapping operation between classical non-separability and entanglement, unveiling a physical connection between two fundamentally different concepts.

Citations

• An operational distinction between quantum entanglement and classical non-separability
• Correlating space, wavelength, and polarization of light: Spatio-Spectral Vector Beams
• Spectral Vector Beams for High-Speed Spectroscopic Measurements
• Demonstration of local teleportation using classical entanglement
• Quantum entanglement
• Entanglement of a Pair of Quantum Bits
• Completely positive linear maps on complex matrices
• Discussion of Probability Relations between Separated Systems
• Can Quantum-Mechanical Description of Physical Reality Be Considered Complete?

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