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Communication

Towards Measuring Terahertz Photon Statistics by a Superconducting Bolometer

Faculty of Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
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Author to whom correspondence should be addressed.
Academic Editors: Ivano Ruo-Berchera and Paolo Traina
Sensors 2021, 21(15), 4964; https://doi.org/10.3390/s21154964
Received: 21 May 2021 / Revised: 16 July 2021 / Accepted: 18 July 2021 / Published: 21 July 2021
(This article belongs to the Special Issue Novel Sensors and Techniques in Quantum Imaging Applications)
Statistical distributions of the analog readings of an antenna-coupled THz superconducting bolometer were measured and analyzed under a special type of irradiation by low-energy fluxes of THz photons with Poisson photon statistics and controllable mean photon numbers. The photons were generated via low-gain parametric down-conversion in pulse-pumped Mg:LiNbO3 crystal placed to a cooled cryostat together with the bolometer NbN film. Results of theoretical approximation of experimental histograms reveal the discrete nature of THz detection by superconducting bolometers and open a way for studying their quantum characteristics. It is shown that bolometer readings per pulse consist of discrete counts (“single charges”), with the mean number linearly dependent on the number of input photons. Contributions of single counts to a total analog reading are statistically distributed according to the normal law, with average values slightly depending on the number of counts in each reading. A general formula is proposed to describe the relationship between continuous statistical distribution of the bolometer readings and discrete quantum statistics of the incident photons. View Full-Text
Keywords: spontaneous parametric down-conversion; superconducting bolometer; photon statistics spontaneous parametric down-conversion; superconducting bolometer; photon statistics
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MDPI and ACS Style

Prudkovskii, P.; Leontyev, A.; Kuznetsov, K.; Kitaeva, G. Towards Measuring Terahertz Photon Statistics by a Superconducting Bolometer. Sensors 2021, 21, 4964. https://doi.org/10.3390/s21154964

AMA Style

Prudkovskii P, Leontyev A, Kuznetsov K, Kitaeva G. Towards Measuring Terahertz Photon Statistics by a Superconducting Bolometer. Sensors. 2021; 21(15):4964. https://doi.org/10.3390/s21154964

Chicago/Turabian Style

Prudkovskii, Pavel, Andrey Leontyev, Kirill Kuznetsov, and Galiya Kitaeva. 2021. "Towards Measuring Terahertz Photon Statistics by a Superconducting Bolometer" Sensors 21, no. 15: 4964. https://doi.org/10.3390/s21154964

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