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You searched on: Author: Zachary Levine

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1. The Poisson-Influenced K-Means Algorithm, a Maximum-Likelihood Procedure for Clusters with a Known Probability Distribution
Published: 4/25/2016
Authors: Zachary H Levine, Brian P. Morris
Abstract: We present an implementation of the Poisson-Influenced K-Means Algorithm (PIKA), first developed to characterize the output of a superconducting transition edge sensor (TES) in the few-photon- counting regime. The algorithm seeks to group a number ...

2. Supplementary material for: The detection of carbon dioxide leaks using quasi-tomographic laser absorption spectroscopy
Published: 4/13/2016
Authors: Zachary H Levine, Adam L Pintar, Jeremy Dobler, Nathan Blume, Michael Braun, Timothy G Pernini
Abstract: Data is provided for the companion paper

3. The detection of carbon dioxide leaks using quasi-tomographic laser absorption spectroscopy measurements in variable wind
Published: 4/13/2016
Authors: Zachary H Levine, Adam L Pintar, Jeremy Dobler, Nathan Blume, Michael Braun, Timothy G Pernini
Abstract: Laser Absorption Spectroscopy (LAS) has been used over the last several decades for the measurement of trace gasses in the atmosphere. For over a decade, DOAS measurements from multiple sources and tens of retororeflectors have been combined with spa ...

4. National Institute of Standards and Technology measurement service of the optical properties of biomedical phantoms: Current status
Published: 3/24/2016
Authors: Paul Lemaillet, Catherine C Cooksey, Zachary H Levine, Adam L Pintar, Jeeseong Hwang, David W Allen
Abstract: The National Institute for Standards and Technology (NIST) has maintained scales of reflectance and transmittance over several decades. Those scales are primarily intended for the regular transmittance, mirrors, and solid surface scattering diffusers ...

5. Adapting the Poisson-Influenced K-Means Algorithm for a Larger User Base
Published: 11/19/2015
Authors: Brian P. Morris, Zachary H Levine
Abstract: A superconducting transition edge sensor (TES) can be a useful tool for counting the number of photons in a highly attenuated pulse of light, but it requires calibration for its outputs to be interpretable as photon numbers. The Poisson-Influenced K- ...

6. Absolute Calibration of a Variable Attenuator Using Few-Photon Pulses
Published: 6/12/2015
Authors: Zachary H Levine, Boris L. Glebov, Adam L Pintar, Alan L Migdall
Abstract: We demonstrate the ability to calibrate a variable optical attenuator directly at the few photon level using a Superconducting Transition Edge Sensor (TES). Because of the inherent linearity of photon number resolving detection, no ex- ternal cali ...

7. A Fixed-Memory Moving, Expanding Window for Obtaining Scatter Corrections in X-Ray CT and Other Stochastic Averages
Published: 5/30/2015
Authors: Zachary H Levine, Adam L Pintar
Abstract: A simple algorithm for averaging a stochastic sequence of 1D arrays in a moving, expanding window is provided. The samples are grouped in bins which increase exponentially in size so that a constant fraction of the samples is retained at any point i ...

8. Photon-number uncertainty in a superconducting transition-edge sensor beyond resolved-photon-number determination
Published: 9/10/2014
Authors: Zachary H Levine, Boris L. Glebov, Alan L Migdall, Thomas Gerrits, Brice R. Calkins, Adriana E Lita, Sae Woo Nam
Abstract: As part of an effort to extend fundamental single-photon measurements into the macroscopic regime, we explore how best to assign photon-number uncertainties to output waveforms of a superconducting Transition Edge Sensor (TES) and how those assignmen ...

9. Polarization-Entangled Photon Pairs From Periodically-Poled Crystalline Waveguides Over a Range of Frequencies
Series: Journal of Research (NIST JRES)
Report Number: 118.018
Published: 8/15/2013
Authors: Zachary H Levine, Dylan A. Heberle
Abstract: We propose a method to extend the range of polarization entanglement in periodically poled rubidium- doped potassium titanyl phosphate (Rb:KTP) and titanium in-diffused lithium niobate (Ti:LN) waveguides. By fabricating waveguides at an angle rel ...

10. Standard Reference Materials for Medical CT
Published: 6/27/2013
Authors: Zachary H Levine, Huaiyu H Chen-Mayer, Adam L Pintar, Daniel S Sawyer
Abstract: NIST Standard Reference Materials 2087 and 2088 for medical computed tomography (CT) have become available. The materials allow CT reconstructions to be tied to the International System of Units in length, density, and mass attenuation coefficient.

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