AI Article Synopsis
- Photonic quantum technologies have advantageous properties like high-speed transmission and low noise, but their application is limited by the diffraction limit of photons.
- Researchers have successfully maintained quantum polarization entanglement using a nanoscale hybrid plasmonic waveguide made of a fiber taper and silver nanowire, achieving a fidelity of 0.932.
- The experiment validated the violation of the CHSH inequality (2.495 ± 0.147), suggesting potential advancements in nanophotonics and quantum optics for applications like highly sensitive quantum imaging and detection.
Article Abstract
Photonic quantum technologies have been extensively studied in quantum information science, owing to the high-speed transmission and outstanding low-noise properties of photons. However, applications based on photonic entanglement are restricted due to the diffraction limit. In this work, we demonstrate for the first time the maintaining of quantum polarization entanglement in a nanoscale hybrid plasmonic waveguide composed of a fiber taper and a silver nanowire. The transmitted state throughout the waveguide has a fidelity of 0.932 with the maximally polarization entangled state Φ(+). Furthermore, the Clauser, Horne, Shimony, and Holt (CHSH) inequality test performed, resulting in value of 2.495 ± 0.147 > 2, demonstrates the violation of the hidden variable model. Because the plasmonic waveguide confines the effective mode area to subwavelength scale, it can bridge nanophotonics and quantum optics and may be used as near-field quantum probe in a quantum near-field micro/nanoscope, which can realize high spatial resolution, ultrasensitive, fiber-integrated, and plasmon-enhanced detection.
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