京都大学と広島大学の研究グループは、複雑な量子もつれの一種である「W状態」を識別する新しい技術を開発した。この進歩は、量子コンピューティングや量子通信の発展を支える可能性がある。
竹内繁樹氏らが率いるチームは、安定した光回路内で3つの光子を用いてこの手法を実証した。この装置は、W状態の巡回シフト対称性に基づいた量子フーリエ変換を実行する。これにより、動作中に複雑な調整を行うことなく、一度の測定で異なる3光子W状態を識別することが可能となった。
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Physicists at MIT have developed a new microscope using terahertz light to directly observe hidden quantum vibrations inside a superconducting material for the first time. The device compresses terahertz light to overcome its wavelength limitations, revealing frictionless electron flows in BSCCO. This breakthrough could advance understanding of superconductivity and terahertz-based communications.
An international team of researchers has achieved a milestone in quantum communication by teleporting the polarization state of a single photon between two separate quantum dots over a 270-meter open-air link. The experiment, conducted at Sapienza University of Rome, demonstrates the potential for quantum relays in future quantum networks. The findings were published in Nature Communications.
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Researchers from the University of the Witwatersrand in South Africa and Huzhou University have discovered hidden topological structures in entangled photons, reaching up to 48 dimensions. These patterns emerge from the orbital angular momentum of light produced via spontaneous parametric downconversion. The findings, published in Nature Communications, suggest new ways to encode quantum information.
Scientists at California Polytechnic State University have discovered new forms of quantum matter by varying magnetic fields over time. The breakthrough, detailed in Physical Review B, shows that time-dependent control can produce stable quantum states without static equivalents. This could advance quantum computing by making systems more resistant to errors.
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For the first time, researchers have demonstrated light behaving like the quantum hall effect, a phenomenon previously observed only in electrons. Photons now drift sideways in quantized steps determined by fundamental constants. This breakthrough could enhance precision measurements and advance quantum photonic technologies.
An international team of researchers has discovered that quantum systems can appear memoryless from one viewpoint while retaining memory from another. The finding, based on Schrödinger and Heisenberg pictures, reveals hidden memory effects in quantum dynamics. This could impact the design of quantum technologies.
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Qunnect, a Brooklyn-based company, has created technology to share quantum-entangled photons for secure communication networks. The firm recently achieved entanglement swapping over 17.6 kilometers of fiber-optic cables between Brooklyn and Manhattan. This advancement supports the development of an unhackable quantum internet.