Subnoise detection of a fast random event

Observation of random, nonrepetitive phenomena is of critical importance in astronomy, spectroscopy, biology, and remote sensing. Heralded by weak signals, hidden in noise, they pose basic detection challenges. In contrast to repetitive waveforms, a single-instance signal cannot be separated from no...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2015-12, Vol.350 (6266), p.1343-1346
Main Authors: Ataie, V., Esman, D., Kuo, B. P.-P., Alic, N., Radic, S.
Format: Article
Language:English
Subjects:
Astronomy
Background noise
Cloning
Confidence intervals
Detectors
Electric noise
Electrical equipment
Imaging
Noise
Signal processing
Spectra
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Summary:Observation of random, nonrepetitive phenomena is of critical importance in astronomy, spectroscopy, biology, and remote sensing. Heralded by weak signals, hidden in noise, they pose basic detection challenges. In contrast to repetitive waveforms, a single-instance signal cannot be separated from noise through averaging. Here, we show that a fast, randomly occurring event can be detected and extracted from a noisy background without conventional averaging. An isolated 80-picosecond pulse was received with confidence level exceeding 99%, even when accompanied by noise. Our detector relies on instantaneous spectral cloning and a single-step, coherent field processor. The ability to extract fast, subnoise events is expected to increase detection sensitivity in multiple disciplines. Additionally, the new spectral-cloning receiver can potentially intercept communication signals that are presently considered secure.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.aac8446