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This breakthrough demonstrates the successful integration of distributed quantum sensing onto a single silicon chip, overcoming previous scalability barriers caused by bulky optical setups. By surpassing the shot-noise limit through on-chip entanglement generation, this development paves the way for compact, high-precision sensors in imaging and materials science.

Source coveringQuantum Zeitgeist

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Bristol Chip Uses Entangled Light to Beat Shot-Noise Limit for Compact Sensors

Quantum ZeitgeistSeptember 17, 20264 min read

A measurement improvement of over 0. 15 decibels beneath conventional limits has been achieved using light, a difference comparable to discerning whispers in a crowded room. This advance stems from distributing quantum entanglement across a single silicon chip, overcoming limitations imposed by traditional optical setups that hinder scalability.

Distributed quantum sensing experiments were previously limited by bulky optical setups hindering scalability. Entanglement-enhanced sensing of linear functions of four phase shifts is now achieved within a single integrated photonic circuit at the University of Bristol. A precision of 0.199 ±0.016 dB below the shot noise limit has been attained, compared to 0.041 ±0.018 dB using separable states; this represents a sharp advance in compact and scalable quantum sensors for applications like precise measurement and imaging. A new method for measuring subtle changes…

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