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This breakthrough addresses a fundamental bottleneck in quantum hardware by enabling continuous microwave single-photon detection with 47% efficiency using superconducting artificial molecules. By eliminating the cyclic "shutter" limitations of previous designs, this advancement directly supports high-bandwidth applications in quantum sensing and fundamental physics research without sacrificing operational continuity. The development represents significant progress toward scalable quantum networks where uninterrupted photon counting is essential for maintaining signal integrity over time.

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Chalmers Team Builds 47% Efficient Microwave Photon Detector

Quantum ZeitgeistAugust 18, 20265 min read

Until now, microwave photon detectors have operated like a camera with a blinking shutter, forcing a compromise between capturing every signal and working continuously. This new detector achieves a continuous detection efficiency of 0. 47 over a 5MHz bandwidth, alongside 0.

A continuous detection efficiency of 0.47 over a 5MHz bandwidth represents an advance in microwave single-photon detection. Previous detectors operated cyclically, creating a trade-off between detection efficiency and continuous operation duration. Vyom Kulkarni and colleagues at Chalmers University of Technology have engineered a continuously operated detector, utilising a superconducting artificial molecule to capture incoming photons. This new approach overcomes previous limitations, enabling continuous microwave photon detection for applications including quantum sensing and fundamental physics. The device achieves an efficiency of 0.47, enabling continuous operation vital for…

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