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Two-Photon Comb Technique Supports 20-km Distribution for Quantum Communication

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YOKOHAMA, Japan, Aug. 31, 2020 — In telecom networks connected by fiber optic cable, transmitted photons tend to be absorbed by the material that comprises the cable after traveling just a few kilometers. To prevent the signal from deteriorating, repeaters are placed at regular intervals of the cable to amplify the signal. Efforts to transmit photons over a quantum internet will face a similar challenge. Professor Tomoyuki Horikiri and colleagues at Yokohama National University are tackling this issue by developing a new source of entangled photons. While entangled photons could be used to transfer information,...Read full article

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    Published: August 2020
    Glossary
    nonlinear optics
    Nonlinear optics is a branch of optics that studies the optical phenomena that occur when intense light interacts with a material and induces nonlinear responses. In contrast to linear optics, where the response of a material is directly proportional to the intensity of the incident light, nonlinear optics involves optical effects that are not linearly dependent on the input light intensity. These nonlinear effects become significant at high light intensities, such as those produced by...
    quantum
    The term quantum refers to the fundamental unit or discrete amount of a physical quantity involved in interactions at the atomic and subatomic scales. It originates from quantum theory, a branch of physics that emerged in the early 20th century to explain phenomena observed on very small scales, where classical physics fails to provide accurate explanations. In the context of quantum theory, several key concepts are associated with the term quantum: Quantum mechanics: This is the branch of...
    quantum optics
    The area of optics in which quantum theory is used to describe light in discrete units or "quanta" of energy known as photons. First observed by Albert Einstein's photoelectric effect, this particle description of light is the foundation for describing the transfer of energy (i.e. absorption and emission) in light matter interaction.
    Research & TechnologyeducationAsia-PacificYokohama National UniversityOpticsnonlinear opticsquantumquantum opticssingle photonsquantum InternetCommunicationsquantum communicationstwo-photon combEntangled photonsfiber opticsoptical fibers

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