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This breakthrough demonstrates that quantum sensors can surpass the standard quantum limit using engineered criticality rather than fragile entangled states, offering a more robust path to detecting ultra-faint magnetic fields. By suppressing internal quantum noise while amplifying signals through diverging susceptibility, this method removes a major practical barrier to deploying high-sensitivity atomic magnetometers in real-world applications. The technique represents a significant step forward in making quantum sensing viable outside of highly controlled laboratory environments.

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Researchers Build Sensor Exceeding Standard Limit by 3.3dB

Quantum ZeitgeistSeptember 18, 20265 min read

An atomic sensor has exceeded the standard measurement limit by 3. 3dB without relying on delicate entangled states. Exploiting engineered criticality, a point where sensitivity dramatically increases, this advance amplifies signals while simultaneously suppressing inherent quantum noise.

A new method to boost sensor sensitivity beyond current boundaries has been demonstrated by Ding Huang of Shanxi University and colleagues at the Shanghai Research Centre for Quantum Sciences and East China Normal University. The sensitivity of quantum sensors is inherently limited by the standard quantum limit stemming from intrinsic quantum fluctuations. Although techniques like squeezing or entanglement can surpass these limitations, applying them is often hindered by unstable entangled states and challenges with creating them. Quantum criticality offers a key alternative via its use of diverging susceptibility to amplify signals without requiring complex non-classical resources. Atomic magnetometers now exhibit a 3.3 dB…

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