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This breakthrough validates silicon nitride photonic platforms as a superior alternative to silicon for generating high-rate four-photon states essential for scalable quantum computing. By achieving a 27Hz count rate on a single chip, the research moves practical quantum information processing beyond laboratory curiosities toward viable network integration. The efficiency gains of over one hundredfold compared to prior implementations significantly lower barriers for deploying real-world quantum systems.

Surse care acoperăQuantum Zeitgeist, Quantum Computing Report, InfoQ

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Hu and Colleagues Demonstrate 0.943 Efficiency Photonic Platform for Quantum Information Processing

Quantum Zeitgeist25 iulie 20266 min de cititArticolul și perspectiva sunt în engleză.

A four-photon quantum state, previously a fleeting laboratory curiosity, has now been generated and measured with a count rate of 27Hz on a single chip. This represents a leap beyond silicon photonics, exceeding previous implementations by more than one hundredfold. The advance establishes silicon nitride as a viable material for building practical, scalable quantum computers and networks.

Integrated photonic circuits create scalable and robust quantum technologies by combining photon sources and linear optical networks on compact chips. Yi-Han Luo and colleagues at International Quantum Academy and Shenzhen Futian SUSTech Institute for Quantum Technology and Engineering and University of Science and Technology of China and Southern University of Science and Technology have addressed a key limitation in these systems, optical loss, by demonstrating a monolithic silicon nitride platform for discrete-variable quantum information processing. Their architecture achieves high-fidelity Einstein-Podolsky-Rosen (EPR) states (0.9875 ±0.0003) and near-unity photon indistinguishability, enabling the synthesis and characterisation of four-photon Greenberger-Horne-Zeilinger states with a record fidelity of 0.943 ±0.008 and a fourfold count rate of…

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