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86 results for “single photons”
Data for "Two-stage, low noise quantum frequency conversion of single photons from silicon-vacancy centers in diamond to the telecom C-band"
<p>The silicon-vacancy center in diamond holds great promise as a qubit for quantum communication networks. However, since the optical transitions are located within the visible red spectral region, quantum frequency conversion to low-loss telecommunication wavelengths becomes a necessity for its use in long-range, fiber-linked networks. This work presents a highly efficient, low-noise quantum frequency conversion device for photons emitted by a silicon-vacancy (SiV) center in diamond to the telecom C-band. By using a two-stage difference-frequency mixing scheme SPDC noise is circumvented and Raman noise is minimized, resulting in a very low noise rate of 10.4(7) photons per second as well as an overall device efficiency of 35.6 %. By converting single photons from SiV centers we demonstrate the preservation of photon statistics upon conversion.</p>
Monte Carlo simulation of water cylinder phantoms for Data Driven Gating (DDG) in single photon emission tomography
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Data for: Motion adaptive deblurring with single photon cameras
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Towards a standard procedure for the measurement of the multi-photon component in a CW telecom heralded single-photon source
<p>Single-photon sources are set to be a fundamental tool for metrological applications as well as for quantum information related technologies. Because of their upcoming widespread dissemination, the need for their characterization and standardization is becoming of the utmost importance. Here, we illustrate a strategy to provide a quantitative estimate of the multi-photon component of a single-photon source, showing the results achieved in a pilot study for the measurement of the second-order autocorrelation function <em>g</em><sup>(2)</sup>(0) of a low-noise CW heralded single photon source prototype (operating at telecom wavelength nm) realized in INRiM. The results of this pilot study, involving INRiM, NPL and PTB, will help to build a robust and unambiguous procedure for the characterization of the emission of a single-photon source.</p>
Optical Bias and Cryogenic Laser Readout of a Multipixel Superconducting Nanowire Single Photon Detector
<p>The complete datasets of the Publication are updloaded in this repository.</p> <p>Have a look into the ReadMe files for further information.</p> <p>Info about the Spice Model: ReadME LTSPICE</p> <p>Info about the Detector Efficiency Analysis: ReadMe Countrate</p> <p>Info about the PNR Extraction: ReadMe PNR Extraction</p> <p>Info about the SNSPD traces: ReadMe Traces </p> <p>Dataset of the Laser Diode Characterisation: IVP_Laserdiode.txt</p> <p> </p> <p> </p> <p> </p>
Raw data for "Deep mouse brain two-photon near-infrared fluorescence imaging using a superconducting nanowire single-photon detector array"
<p>Two-photon microscopy (2PM) has become an important tool in biology to study the structure and function of intact tissues in-vivo. However, adult mammalian tissues such as the mouse brain are highly scattering, thereby putting fundamental limits on the achievable imaging depth, which typically resides around 600-800um. In principle, shifting both the excitation as well as (fluorescence) emission light to the shortwave near-infrared (SWIR, 1000-1700 nm) region promises substantially deeper imaging in 2PM, yet has proven challenging in the past due to the limited availability of detectors and probes in this wavelength region. To overcome these limitations and fully capitalize on the SWIR region, in this work we introduce a novel array of superconducting nanowire single-photon detectors (SNSPDs) and associated custom detection electronics for the use in near-infrared 2PM. The SNSPD array exhibits high efficiency and dynamic range, as well as low dark-count rates over a wide wavelength range. Additionally, the electronics and software permit seamless integration into typical 2PM systems. Together with a fluorescent dye emitting at 1105 nm, we report imaging depth of > 1.1mm in the in-vivo mouse brain, limited only by available labeling density and laser power. Our work further establishes SWIR 2PM approaches and SNSPDs as promising technologies for deep tissue biological imaging. </p>
Dataset and processing scripts for manuscript titled "Broadband polarization insensitivity and high detection efficiency in high-fill-factor superconducting microwire single-photon detectors"
<p>The manuscript "Broadband polarization insensitivity and high detection efficiency in high-fill-factor superconducting microwire single-photon detectors" contains results for high-efficiency, low-polarization-sensitivity superconducting microwire single-photon detectors. All of the data gathered and the python scripts used for processing is being provided as a zip archive, along with a digital signature file. The dataset contains crucial procedures regarding the equipment calibrations used for accurate device efficiency measurements.</p>
Benchmarking single-photon sources from an auto-correlation measurement
<p>Dataset of measurements for "Benchmarking single-photon sources from an auto-correlation measurement".</p>
A Marble and a Photon: Single Speed Hypothesis
<p><span><span> </span>This study explores the concept of velocity within the framework of the physical interpretation of acceleration and deceleration for moving objects in space. A thought experiment involving a marble and a photon is employed to introduce the hypothesis that all objects in space inherently travel at the speed of light when in motion. Through a series of systematically structured thought experiments, this hypothesis and related conclusions are examined and substantiated. Newton’s first law of motion serves as the foundation for these scenarios, allowing for logical conclusions to be derived. The methodology prioritizes logical reasoning over detailed mathematical formulations to provide a more accessible presentation.</span></p>
Controlled multi-photon subtraction with cascaded Rydberg superatoms as single-photon absorbers
<p>Data for "Controlled multi-photon subtraction with cascaded Rydberg superatoms as single-photon absorbers"</p>
Ultrafast electric control of cavity mediated single-photon and photon-pair generation with semiconductor quantum dots
<p>Dataset of the publication "Ultrafast electric control of cavity mediated single-photon and photon-pair generation with semiconductor quantum dots" (10.1103/PhysRevB.104.085308)</p>
Observation of robust energy transfer in the photosynthetic protein allophycocyanin using single-molecule pump-probe spectroscopy - single-molecule photon stream
<p>Photon stream used in the article "<em>Observation of robust energy transfer in the photosynthetic protein allophycocyanin using single-molecule pump-probe spectroscopy" </em> to analyze single-molecule fluorescence emission. Detected emission for single-molecule pump-probe experiments with an associated instrument response function (IRF) and background fluoresence (BG). Each detected photon is described by its time within the collected photon stream and its time relative to the excitation laser. Data is organized by sample and by date. Also included is an .xlsx document with fitted timescales for all included molecules and Matalb structure titled 'FinalDataAndStatistics.mat', which includes the final data, and statistics for the data used within the paper.</p>
Photon bound state dynamics from a single artificial atom: Source Data
<p>Source Data for figures in main manuscript of <strong>Tomm, N., Mahmoodian, S., et al., <em>Photon bound state dynamics from a single artificial atom</em></strong>.</p>
Caffeine's Effect on Regadenoson Administration With Single Photon Emission Computed Tomography (SPECT) Myocardial Perfusion Imaging (MPI)
ClinicalTrials.gov study NCT00826280. IPD Sharing: YES. Countries: 1. Publications: 1.
A Study of Regadenoson in Subjects Undergoing Stress Myocardial Perfusion Imaging (MPI) Using Multidetector Computed Tomography (MDCT) Compared to Single Photon Emission Computed Tomography (SPECT)
ClinicalTrials.gov study NCT01334918. IPD Sharing: YES. Countries: 1. Publications: 1.
Rapid Stress/Rest Single-Day Tc-99m Sestamibi Myocardial Single Photon Emission Computed Tomography
ClinicalTrials.gov study NCT01434641. IPD Sharing: Not stated. Countries: 1. Publications: 1.
A Study to Assess Regadenoson Administration Following an Inadequate Exercise Stress Test as Compared to Regadenoson Alone for Myocardial Perfusion Imaging (MPI) Using Single Photon Emission Computed
ClinicalTrials.gov study NCT01618669. IPD Sharing: UNDECIDED. Countries: 4. Publications: 1.
Third-order photon correlations to extract single nanocrystal multiexciton properties in solution
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Deterministically fabricated spectrally-tunable quantum dot based single-photon source
<p>Deterministically fabricated spectrally-tunable quantum dot based single-photon source<br> Spectrally-tunable quantum light sources are key elements for the realization of long-distance quantum communication. A deterministically fabricated single-photon source with a photon extraction efficiency of η =(20 ± 2) %, a maximum tuning range of ΔE =  2.5 meV and a minimum g(2)(τ = 0) = 0.03 ± 0.02 is presented. The device consists of a single pre-selected quantum dot (QD) monolithically integrated into a microlens that is bonded onto a piezoelectric actuator via gold thermocompression bonding. Here, a thin gold layer simultaneously provides strain transfer and acts as a backside mirror for the QD-microlens to maximize the photon extraction efficiency. The QD-microlens structure is patterned via 3D in-situ electron-beam lithography (EBL), which allows us to pre-select and integrate suitable QDs based on their emission intensity and energy with a spectral accuracy of 1 meV for the final device. Together with strain fine-tuning, this enables the scalable realization of single-photon sources with identical emission energy. Moreover, we show that the emission energy of the source can be stabilized to µeV accuracy by closed-loop optical feedback. Thus, the combination of deterministic fabrication, spectral-tunability and high broadband photon-extraction efficiency makes the QD-microlens single-photon source an interesting building block for the realization of quantum communication networks.</p>
Identification of distinct pH-and zeaxanthin-dependent quenching in LHCSR3 from C. reinhardtii - single-molecule photon stream
<p>Photon stream used in the article "Identification of distinct pH-and zeaxanthin-dependent quenching in LHCSR3 from <em>Chlamydomonas reinhardtii"</em> to analyze single-molecule fluorescence emission. Detected emission of WT LHCSR3 and stop-LHCSR3 at pH 7.5 and pH 5 along with associated instrument response function (IRF) and measurements of background fluorescence (BG). Each detected photon is described by its time within the collected photon stream and its time relative to the excitation laser.</p>
ScienceDex guides
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These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.