Related papers: Electric-field metrology of a terahertz frequency comb using Rydberg atoms

Electric-field metrology of a terahertz frequency comb using Rydberg atoms

URL: http://arxiv.org/abs/2508.20698v2
Date: Thu, 23 Oct 2025 07:36:50 GMT
Title: Electric-field metrology of a terahertz frequency comb using Rydberg atoms
Authors: Wiktor Krokosz, Jan Nowosielski, Bartosz Kasza, Sebastian Borówka, Mateusz Mazelanik, Wojciech Wasilewski, Michał Parniak,
Abstract summary: We employ a novel type of single-photon detector based on Rydberg atoms to both detect and calibrate a terahertz frequency comb.<n>Our results elucidate the transition of terahertz frequency combs into the quantum regime, enabling high-precision and high-sensitivity spectroscopy.
Score: 0.0
License: http://creativecommons.org/licenses/by/4.0/
Abstract: Terahertz radiation finds an increasing number of applications, yet efficient generation and detection remain a challenge and an active area of research. In particular, the precise detection of weak and narrowband terahertz signals is notoriously difficult. Here, we employ a novel type of single-photon detector based on Rydberg atoms to both detect and calibrate a terahertz frequency comb over an octave-spanning range, yet with a MHz-level selectivity. We calibrate the intensity of the electric field of the comb against the fundamental atomic properties, while achieving the intensity (power) sensitivity down to 45.2 $\mathrm{fW\ cm^{-2}\ Hz^{-0.5}}$ (1.84 $\mathrm{fW\ Hz^{-0.5}}$) within a single mode of the frequency comb, all in a room-temperature operated setup. Our results elucidate the transition of terahertz frequency combs into the quantum regime, enabling high-precision and high-sensitivity spectroscopy. This breakthrough allows terahertz science to better leverage revolutionary techniques developed for optical frequency combs.

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