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Ultrahigh-gain colloidal quantum dot infrared avalanche photodetectors.
Nat Nanotechnol
December 2024
School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea.
Colloidal quantum dots (CQDs) are promising for infrared photodetectors with high detectivity and low-cost production. Although CQDs enable photoinduced charge multiplication, thermal noise in low-bandgap materials limits their performance in IR detectors. Here we present a pioneering architecture of a CQD-based infrared photodetector that uses kinetically pumped avalanche multiplication.
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- * The study explores multidimensional photon detection to boost the efficiency of generating random numbers from individual photon events, which is key to increasing overall generation rates.
- * Using advanced technology, they successfully extract up to 20 bits per photon detection and achieve a random number generation rate of 2.067 Gbps, representing a significant technical advancement.
Engineering of Impact Ionization Characteristics in GaAs/GaAsBi Multiple Quantum Well Avalanche Photodiodes.
ACS Photonics
November 2024
Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield S1 3JD, United Kingdom.
The presence of large bismuth (Bi) atoms has been shown to increase the spin-orbit splitting energy in bulk GaAsBi, reducing the hole ionization coefficient (β) and thereby reducing the excess noise seen in avalanche photodiodes. In this study, we show that even very thin layers of GaAsBi introduced as quantum wells (QWs) in a GaAs matrix exhibit a significant reduction of β while leaving the electron ionization coefficient, α, largely unchanged. The optical and avalanche multiplication properties of a series of GaAsBi/GaAs multiple quantum well (MQW) p-i-n structures with nominally 5 nm thick, 4.
View Article and Find Full Text PDFEffects of multi-photon states in the calibration of single-photon detectors based on a portable bi-photon source.
AVS Quantum Sci
December 2024
Center for Quantum Information and Control, Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131, USA.
Single-photon detectors (SPDs) are ubiquitous in many protocols for quantum imaging, sensing, and communications. Many of these protocols critically depend on the precise knowledge of their detection efficiency. A method for the calibration of SPDs based on sources of quantum-correlated photon pairs uses single-photon detection to generate heralded single photons, which can be used as a standard of radiation at the single-photon level.
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