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。
Researchers at the University of Chicago have developed a straightforward method to produce complex entangled quantum states using basic adjustments in optical cavity systems. The approach relies on existing laboratory tools and could advance quantum sensing applications. Their findings appear in a recent issue of Physical Review X.
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Researchers at the University of Oxford have generated a new family of quantum superpositions using nonclassical components in a trapped ion system. The work demonstrates programmable control over exotic motional states and could advance quantum technologies.
Researchers in Finland have measured an energy signal smaller than one zeptojoule using a new calorimeter. The achievement opens pathways for improved quantum computing and searches for dark matter.
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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.
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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An international team of researchers has directly observed angular momentum transfer in a crystal for the first time, revealing an unexpected reversal in atomic rotation direction. The discovery, achieved with powerful terahertz laser pulses on bismuth selenide, highlights a quantum effect tied to crystal symmetry. Findings were published in Nature Physics.