Ultimate limits of exoplanet spectroscopy: a quantum approach

Abstract

One of the big challenges in exoplanet science is to determine the atmospheric makeup of extrasolar planets, and to find biosignatures that hint at the existence of biochemical processes on another world. The biomarkers we are trying to detect are gases in the exoplanet atmosphere like oxygen or methane, which have deep absorption features in the visible and near-infrared spectrum. Here we establish the ultimate quantum limit for determining the presence or absence of a spectral absorption line, for a dim source in the presence of a much brighter stellar source. We characterise the associated error exponent in both the frameworks of symmetric and asymmetric hypothesis testing. We found that a structured measurement based on spatial demultiplexing allows us to decouple the light coming from the planet and achieve the ultimate quantum limits. If the planet has intensity $\epsilon \ll 1$ relative to the star, we show that this approach significantly outperforms direct spectroscopy yielding an improvement of the error exponent by a factor $1/\epsilon$. We find the optimal measurement, which is a combination of interferometric techniques and spectrum analysis.

9 pages, 5 figures, and appendix; comments are welcome

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• The Quantum Chernoff Bound
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Cited by in corpus (10)

• Single-photon sub-Rayleigh precision measurements of a pair of incoherent sources of unequal intensity
• Spatial-mode-demultiplexing for enhanced intensity and distance measurement
• Exact quantum sensing limits for bosonic dephasing channels
• Single-photon super-resolved spectroscopy from spatial-mode demultiplexing
• Super-resolution of ultrafast pulses via spectral inversion
• Tight information bounds for spontaneous emission lifetime resolution of quantum sources with varied spectral purity
• Machine learning with sub-diffraction resolution in the photon-counting regime
• Superresolving collective quantum measurements
• Quantum Limits of Exoplanet Detection and Localization
• Towards Quantum Limited Spatial Resolution of NV-Diamond Magnetometry