Quantum network test checks entanglement without having to trust detectors
Researchers at Shandong University have developed a new method to verify quantum entanglement in a network without needing to trust the measurement devices. This advancement, published in Physical Review Letters, helps ensure the security and integrity of quantum communication systems.
Why it matters
This breakthrough addresses a fundamental challenge in quantum networking, moving the technology closer to practical, secure implementation.
edited by Sadie Harley , reviewed by Robert Egan
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Add to Preferred Sources Illustration of a four-user fully connected quantum network. A broadband integrated lithium-niobate photon source distributes time-bin entangled photon pairs across six connections. By using the polarization of the same photons as trusted quantum inputs, the researchers can verify and quantify entanglement without trusting the measurement devices or requiring additional photons. Credit: Liu et al. Quantum networks are systems that connect different users or devices using principles of quantum mechanics. In the future, these networks could help improve the security of communications.
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