Publication

Frequency-resolved observation of the Hanbury Brown-Twiss effect

Claudio Bruschini
2025

Abstract

Fast and precise spectrometers have numerous applications in quantum sciences, astronomy, and other fields. Thanks to the recent advances in the technology of single-photon detectors, their timing and spectral resolution approach fundamental limits dictated by the Heisenberg uncertainty principle (HUP) allowing new measurements, which were not possible before. In this work, we present a simple and fast spectrometer based on the LinoSPAD2 detector. With an array of 512 SPADs with a pixel size of 26 um2, we can achieve 0.1 nm/pixel spectral resolution with off-the-shelf optical components. Thanks to the 40 ps rms timing resolution of each SPAD, we can operate a factor of 10 above the HUP. We present measurements of the Hanbury Brown-Twiss effect at multiple frequencies using both the discrete spectral lines of a noble gas source and a broadband source of light (LED).

Official source

https://infoscience.epfl.ch/entities/publication/f008401d-87fc-431e-86d0-208bb6fb0af9

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Claudio Bruschini
2025

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/f008401d-87fc-431e-86d0-208bb6fb0af9

About this result

Related concepts (32)

Mass spectrometry

Mass spectrometry (MS) is an analytical technique that is used to measure the mass-to-charge ratio of ions. The results are presented as a mass spectrum, a plot of intensity as a function of the mass-to-charge ratio. Mass spectrometry is used in many different fields and is applied to pure samples as well as complex mixtures. A mass spectrum is a type of plot of the ion signal as a function of the mass-to-charge ratio.

Optical spectrometer

An optical spectrometer (spectrophotometer, spectrograph or spectroscope) is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum, typically used in spectroscopic analysis to identify materials. The variable measured is most often the irradiance of the light but could also, for instance, be the polarization state. The independent variable is usually the wavelength of the light or a unit directly proportional to the photon energy, such as reciprocal centimeters or electron volts, which has a reciprocal relationship to wavelength.

Spectral line

A spectral line is a weaker or stronger region in an otherwise uniform and continuous spectrum, resulting from emission or absorption of light in a narrow frequency range, compared with the nearby frequencies. Spectral lines are often used to identify atoms and molecules. These "fingerprints" can be compared to the previously collected ones of atoms and molecules, and are thus used to identify the atomic and molecular components of stars and planets, which would otherwise be impossible.