Journal
PHYSICAL REVIEW LETTERS
Volume 119, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.119.043603
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Funding
- MINECO/FEDER
- MINECO project MAQRO [FIS2015-68039-P]
- MINECO project XPLICA [FIS2014-62181-EXP]
- European Union Project QUIC [641122]
- European Research Council project AQUMET [280169]
- Fundacio Privada CELLEX
- Severo Ochoa Grant [SEV-2015-0522]
- [2014-SGR-1295]
- European Research Council (ERC) [280169] Funding Source: European Research Council (ERC)
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We demonstrate a new technique for detecting the amplitude of arbitrarily chosen components of radio-frequency waveforms based on stroboscopic backaction evading measurements. We combine quantum nondemolition measurements and stroboscopic probing to detect waveform components with magnetic sensitivity beyond the standard quantum limit. Using an ensemble of 1.5 x 10(6) cold rubidium atoms, we demonstrate entanglement-enhanced sensing of sinusoidal and linearly chirped waveforms, with 1.0(2) and 0.8(3) dB metrologically relevant noise reduction, respectively. We achieve volume-adjusted sensitivity of delta B root V approximate to 3.96 ft root cm(2)/Hz, comparable to the best rf magnetometers.
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