期刊
QUANTUM SCIENCE AND TECHNOLOGY
卷 4, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2058-9565/aae284
关键词
quantum metrology; bosonic channels; quantum correlations
资金
- European Commission under the Marie Sklodowska-Curie Fellowship Progamme (EC) [745727]
- Leverhulme Trust ('qBIO' fellowship)
- EPSRC ('qDATA') [EP/L011298/1]
- EPSRC [EP/L011298/1] Funding Source: UKRI
- Marie Curie Actions (MSCA) [745727] Funding Source: Marie Curie Actions (MSCA)
In bosonic quantum metrology, the estimate of a loss parameter is typically performed by means of pure states, such as coherent, squeezed or entangled states, while mixed thermal probes are discarded for their inferior performance. Here we show that thermal sources with suitable correlations can be engineered in such a way to approach, or even surpass, the error scaling of coherent states in the presence of general Gaussian decoherence. This decoherence is modeled by including bosonic loss, thermal noise, and even the possibility of environmental correlations, so as to simulate non-Markovian dynamics. Our findings pave the way for practical quantum metrology with thermal sources in optical instruments (e.g., photometers) or at different wavelengths (e.g., far infrared, microwave or x-ray) where the generation of quantum features, such as coherence, squeezing or entanglement, may be extremely challenging.
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