2025/12/02 by Elise Bailly, Bailly-Rioufreyt, Elise, Zoya Polshchykova +23
Computer Science · Physics and Astronomy · #FOS: Physical sciences #Mechanical and Optical Resonators #Optics (physics.optics) #Photon #Photonics #Polarization (electrochemistry) #Quantum #Quantum Information and Cryptography #Quantum Physics (quant-ph) #Quantum entanglement #Quantum information science #Quantum state #Scalability #Spontaneous parametric down-conversion #Strong Light-Matter Interactions
paper · pdf · doi:10.48550/arxiv.2512.02980
published in arXiv (Cornell University) (Cornell University)
openalex publication_date 2025/12/02 · openalex created_date 2025/12/04 · openalex updated_date 2026/08/05
Quantum entanglement is a fundamental resource for emerging quantum technologies, enabling secure communication and enhanced sensing. For decades, generating polarization entangled states has been mainly achieved using bulk crystals with spontaneous parametric down conversion (SPDC), preventing scalability and on-chip integration. Miniaturizing the quantum source provides access to more versatility and tunability while enabling an easier integration to other devices, notably necessary for satellite-based quantum communication, and eventually reducing fabrication costs. This challenging task can be achieved with Zinc Blende GaAs nanowires. They already have shown an efficient photon pairs generation via SPDC at 1550 nm. Here we demonstrate that a pair of orthogonal GaAs nanowires constitutes a new nanoscale platform to control the quantum state at telecommunication wavelength, enabling a transition from polarization entangled to separable states as a function of the pump polarization, with fidelities reaching 90%