Article
Quantum Science & Technology
Lorenzo Stasi, Patrik Caspar, Tiff Brydges, Hugo Zbinden, Felix Bussieres, Rob Thew
Summary: Herald single-photon sources (HSPS) face the challenge of multiphoton emission, which requires a trade-off between single-photon quality and heralding rate. Photon-number-resolving (PNR) detectors are implemented to filter out heralding events with more than one photon pair, improving the HSPS.
QUANTUM SCIENCE AND TECHNOLOGY
(2023)
Article
Physics, Applied
Peizhan Li, Jiaqiang Zhong, Wen Zhang, Zheng Wang, Qingxiao Ma, Zhifa Feng, Wei Miao, Yuan Ren, Jing Li, Qijun Yao, Shengcai Shi
Summary: This article reports a titanium (Ti) TES-based single-photon detector with high detection efficiency and photon-number resolving capability at a working wavelength of 1550 nm. The detector has a low dark count rate and can resolve up to 20 photons.
JOURNAL OF LOW TEMPERATURE PHYSICS
(2023)
Article
Physics, Applied
Kaori Hattori, Toshio Konno, Yoshitaka Miura, Sachiko Takasu, Daiji Fukuda
Summary: This study tested an Au/Ti (10/20 nm) bilayer TES that achieved a high energy resolution by lowering the critical temperature Tc to 115 mK. The results have important implications for improving the energy resolution in biological imaging and microscopic spectroscopy.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Optics
Yansheng Bao, Bochen Wang, Qianhe Shao, Changyong Tian, Zhengyong Li
Summary: We demonstrate self-calibration of a photon-number-resolving (PNR) detector system to reduce PNR errors and optimize photon statistics distribution. Our method calibrates voltage ranges of the pulse height histogram corresponding to photon number states and optimizes photon statistics distribution without the need for standard detectors. The optimized photon statistics distributions agree with theoretical calculations and greatly reduce the relative errors of the average photon number compared to preliminary reconstruction. Our results are valuable for various PNR applications.
OPTICS COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
I. K. A. da Silva, F. A. Mendonca, R. V. Ramos
Summary: The article introduces an analytical expression for improving the performance of a multi-photon number resolving detector when measuring coherent states. By transforming the static MPNRD device into a dynamic one, it overcomes the impact of optical losses and non-unit quantum efficiency.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Optics
Mamoru Endo, Ruofan He, Tatsuki Sonoyama, Kazuma Takahashi, Takahiro Kashiwazaki, Takeshi Umeki, Sachiko Takasu, Kaori Hattori, Daiji Fukuda, Kosuke Fukui, Kan Takase, Warit Asavanant, Petr Marek, Radim Filip, Akira Furusawa
Summary: This paper presents the generation of non-Gaussian states on 8-ps optical wave packets in the 1545.32 nm telecommunication wavelength band using photon subtraction up to three photons. Negative values of the Wigner function were observed without loss correction. This technology can be extended to the generation of more complicated non-Gaussian states and is important for high-speed optical quantum computation.
Article
Physics, Applied
Hao Hao, Qing-Yuan Zhao, Ling-Dong Kong, Shi Chen, Hui Wang, Yang-Hui Huang, Jia-Wei Guo, Chao Wan, Hao Liu, Xue-Cou Tu, La-Bao Zhang, Xiao-Qing Jia, Jian Chen, Lin Kang, Cong Li, Te Chen, Gui-Xing Cao, Pei-Heng Wu
Summary: Photon number resolving is crucial for detectors in quantum and classical applications. By utilizing a matched filter and a cryogenic amplifier, the performance of series PNR-SNSPD can be improved, achieving a maximum resolved photon number of 65 or even larger.
APPLIED PHYSICS LETTERS
(2021)
Article
Multidisciplinary Sciences
Byeong-Yoon Go, Changhyoup Lee, Kwang-Geol Lee
Summary: This study examines a quantum-enhanced differential measurement scheme using quantum probes and single-photon detectors to measure a minute defect in the absorption parameter of an analyte. The research compares the signal-to-noise ratios (SNRs) of different probe states with a classical imaging scheme and considers typical system imperfections. The study shows that quantum enhancement can be described by specific parameters and can be further improved.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Inorganic & Nuclear
Natsumi Kimoto, Hiroaki Hayashi, Takumi Asakawa, Cheonghae Lee, Takashi Asahara, Tatsuya Maeda, Sota Goto, Yuki Kanazawa, Akitoshi Katsumata, Shuichiro Yamamoto, Masahiro Okada
Summary: This study introduces an effective method for determining atomic number (Z(eff)) based on a photon-counting technique, which corrects for beam hardening effect and detector response for high accuracy material identification. The method was demonstrated on X-ray images from an energy-resolving photon-counting detector, resulting in a Z(eff) image with an accuracy of Z(eff) +/- 0.5 regardless of mass thickness.
APPLIED RADIATION AND ISOTOPES
(2021)
Article
Materials Science, Multidisciplinary
Philipp Karl, Sandra Mennle, Monika Ubl, Mario Hentschel, Philipp Flad, Jing-Wei Yang, Tzu-Yu Peng, Yu-Jung Lu, Harald Giessen
Summary: The development of photon-based technologies such as quantum cryptography and quantum computing relies on high-fidelity and fast photodetectors capable of detecting single photons. Superconducting nanowire single photon detectors, utilizing the superconducting-to-normal conducting phase transition, offer a promising solution. Using resonant plasmonic perfect absorber effects, these detectors can achieve high efficiency, polarization-independent absorption at a specific wavelength. Additionally, the target wavelength can be easily adjusted by modifying the detector's geometry.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Optics
Guang-Zhao Xu, Wei-Jun Zhang, Li-Xing You, Jia-Min Xiong, Xing-Qu Sun, Hao Huang, Xin Ou, Yi-Ming Pan, Chao-Lin Lv, Hao Li, Zhen Wang, Xiao-Ming Xie
Summary: Superconducting microstrip single-photon detectors (SMSPD) have smaller kinetic inductance, higher working current, and lower fabrication requirements compared to traditional SNSPDs, making them potentially useful in the development of ultralarge active area detectors. However, research on SMSPD is still in its early stages, and achieving high performance and practical use remains an open question.
PHOTONICS RESEARCH
(2021)
Article
Optics
Shuo Li, Wenchao Li, Vladislav V. Yakovlev, Allison Kealy, Andrew D. Greentree
Summary: Achieving a fundamental understanding of biological pathways requires minimally invasive nanoscopic optical resolution imaging. In this study, a new approach is proposed by utilizing quantum measurements of photon number distributions to determine the number and probability of emission from single-photon emitters. This technique has great potential in quantum optical imaging with nanoscopic resolution.
Article
Geochemistry & Geophysics
Mingjia Shangguan, Zhifeng Yang, Zaifa Lin, Zhongping Lee, Haiyun Xia, Zhenwu Weng
Summary: Oceanic lidar is a powerful technology for oceanic 3-D remote sensing. This study presents a compact single-photon lidar system for long-range underwater measurement, using a single-photon detector, low pulse energy laser, and narrow linewidth fiber laser. Experimental results demonstrate high spatial-temporal resolution and long-range capabilities, making it suitable for various applications including marine biogeochemical parameter sensing and underwater imaging.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2023)
Article
Physics, Applied
Q. Pears Stefano, A. G. Magnoni, J. Estrada, C. Iemmi, D. Rodrigues, J. Tiffenberg
Summary: We have developed an imaging device in the infrared wavelength range that can arbitrarily reduce readout noise. The device has photon-number-resolving capability, high spatial resolution, high quantum efficiency in the near-infrared, and ultralow dark counts. By reducing the readout noise to less than 0.2e-, we are able to image objects in a broad range of intensities and reveal shapes previously hidden in the noise.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Multidisciplinary
Zhang Wen-Ying, Hu Peng, Xiao You, Li Hao, You Li-Xing
Summary: This study proposes a high-efficiency polarization-insensitive SNSPD based on the traditional meandering nanowire structure. By introducing a thin silicon film as a cladding layer and designing a sinusoidal-shaped grating structure, optimizing a twin-layer nanowire structure, and using a dielectric mirror, the optical absorption efficiency of the device is enhanced. The fabricated device shows a maximum detection efficiency of 87% at 1605 nm with a polarization extinction ratio of 1.06, and it achieves a detection efficiency exceeding 50% with a polarization extinction ratio less than 1.2 in a wide wavelength range.
ACTA PHYSICA SINICA
(2021)
Article
Optics
Vojtech Svarc, Josef Hlousek, Martina Novakova, Jaromir Fiurasek, Miroslav Jezek
Article
Physics, Applied
Vaclav Michalek, Jan Perina, Ondrej Haderka
PHYSICAL REVIEW APPLIED
(2020)
Article
Engineering, Electrical & Electronic
Ivo Straka, Jan Grygar, Josef Hlousek, Miroslav Jezek
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2020)
Article
Physics, Multidisciplinary
Robert Starek, Michal Micuda, Ivo Straka, Martina Novakov, Miloslav Dusek, Miroslav Jezek, Jaromir Fiurasek, Radim Filip
NEW JOURNAL OF PHYSICS
(2020)
Article
Optics
Robert Starek, Michal Micuda, Radim Hosak, Miroslav Jezek, Jaromir Fiurasek
Article
Physics, Multidisciplinary
Josef Hlousek, Miroslav Jezek, Jaromir Fiurasek
Summary: This paper proposes and experimentally demonstrates a method for directly certifying the non-Gaussianity and Wigner function negativity of photonic quantum detectors, using only two classical thermal states and a vacuum state for probing. The results show the feasibility of benchmarking photonic quantum detectors with a few measurements on classical states.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Martin Bielak, Robert Starek, Vojtech Krcmarsky, Michal Micuda, Miroslav Jezek
Summary: Liquid crystal devices are essential in optical metrology, optical communications, polarization-sensitive imaging, and photonic information processing, and can achieve fast preparation and detection of polarization states with unprecedented accuracy.
Article
Instruments & Instrumentation
Glib Mazin, Ales Stejskal, Michal Dudka, Miroslav Jezek
Summary: The non-blocking high-resolution digital delay line based on asynchronous circuit design allows for an efficient trade-off between resolution and delay range, with minimized dead time operation. Experimental characterization revealed linear dependence of delay on temperature, increasing timing jitter over the delay dynamic range, and the use of pulse shrinking circuits to reduce pulse spreading effect. This delay line is suitable for applications requiring dead time minimization and acceptable excess jitter in advanced photonic networks.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Physics, Applied
Dominik Vasinka, Martin Bielak, Michal Neset, Miroslav Jezek
Summary: This study presents direct and inverse models for liquid crystal polarization transformation based on deep neural networks, radial basis functions, and linear interpolation. Using deep learning significantly improves accuracy, with decreasing errors as training data increases. The research has important implications for improving the control accuracy of liquid crystals in various fields.
PHYSICAL REVIEW APPLIED
(2022)
Article
Optics
Jan Perina, Pavel Pavlicek, Vaclav Michalek, Radek Machulka, Ondrej Haderka
Summary: This study derives nonclassicality criteria for general N-dimensional optical fields, which involve intensity moments, photon-number distribution probabilities, or combinations of both. The Hillery criteria for sums of even or odd photon numbers are generalized to N-dimensional fields. These criteria are then applied to an experimental three-mode optical field containing two types of photon-pair contributions, and the accompanying nonclassicality depths are used for performance comparison.
Article
Optics
Jan Perina, Vaclav Michalek, Radek Machulka, Ondrej Haderka
Summary: The research shows that the twin beams exhibit anticorrelations in photon-number fluctuations in the signal and idler beams under specific conditions, with sub-Poissonian photon-number statistics. The postselected fields are reconstructed from experimental data using the maximum likelihood method, and their nonclassical properties are analyzed and quantified using appropriate criteria. Comparisons are made between the postselected fields obtained with actual and ideal photon-number-resolved detectors.
Article
Optics
Radim Hosak, Ivo Straka, Ana Predojevic, Radim Filip, Miroslav Jezek
Summary: The study proposes a workflow for evaluating the quality of entanglement sources, estimating the potential performance of quantum entanglement sources in quantum key distribution protocols based on quantum state density matrices from theoretical models and experimental data. It highlights the trade-off between the generation rate and quality of entangled pairs due to the multiphoton nature of the generated quantum states. The research finds that the secure key rate of down-converted photon pairs is limited by intrinsic multiphoton contributions, and identifies an optimum gain for continuous-wave down-conversion sources.
Article
Optics
Ivo Straka, Miroslav Jezek
Summary: The proposed method allows for arbitrarily shaping and scaling the temporal intensity correlations of an optical signal locally, without periodic correlations. Experimental demonstration using stochastic intensity modulation was conducted, along with analysis and simulation of shaping both temporal correlations and photon statistics specified by the user. The study shows that temporal correlations, within the constraints of monotony and convexity, are independent of photon statistics and can take on any shape.
Article
Optics
Jan Perina, Ondrej Haderka, Vaclav Michalek
Article
Optics
Radek Machulka, Jan Perina, Ondrej Haderka, Alessia Allevi, Maria Bondani
