skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Electronic noise in optical homodyne tomography

Abstract

The effect of the detector electronic noise in an optical homodyne tomography experiment is shown to be equivalent to optical loss if the detector is calibrated by measuring the quadrature noise of the vacuum state. An explicit relation between the electronic noise level and the equivalent optical efficiency is obtained and confirmed in an experiment with a narrow-band squeezed vacuum source operating at an atomic rubidium wavelength.

Authors:
; ; ;  [1]
  1. Institute for Quantum Information Science, University of Calgary, Calgary, Alberta T2N 1N4 (Canada)
Publication Date:
OSTI Identifier:
20982425
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 75; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevA.75.035802; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; EFFICIENCY; LOSSES; NOISE; QUADRATURES; RUBIDIUM; TOMOGRAPHY; VACUUM STATES; WAVELENGTHS

Citation Formats

Appel, Juergen, Hoffman, Dallas, Figueroa, Eden, and Lvovsky, A. I.. Electronic noise in optical homodyne tomography. United States: N. p., 2007. Web. doi:10.1103/PHYSREVA.75.035802.
Appel, Juergen, Hoffman, Dallas, Figueroa, Eden, & Lvovsky, A. I.. Electronic noise in optical homodyne tomography. United States. doi:10.1103/PHYSREVA.75.035802.
Appel, Juergen, Hoffman, Dallas, Figueroa, Eden, and Lvovsky, A. I.. Thu . "Electronic noise in optical homodyne tomography". United States. doi:10.1103/PHYSREVA.75.035802.
@article{osti_20982425,
title = {Electronic noise in optical homodyne tomography},
author = {Appel, Juergen and Hoffman, Dallas and Figueroa, Eden and Lvovsky, A. I.},
abstractNote = {The effect of the detector electronic noise in an optical homodyne tomography experiment is shown to be equivalent to optical loss if the detector is calibrated by measuring the quadrature noise of the vacuum state. An explicit relation between the electronic noise level and the equivalent optical efficiency is obtained and confirmed in an experiment with a narrow-band squeezed vacuum source operating at an atomic rubidium wavelength.},
doi = {10.1103/PHYSREVA.75.035802},
journal = {Physical Review. A},
number = 3,
volume = 75,
place = {United States},
year = {Thu Mar 15 00:00:00 EDT 2007},
month = {Thu Mar 15 00:00:00 EDT 2007}
}
  • We present and demonstrate a method for optical homodyne tomography based on the inverse Radon transform. Different from the usual filtered back-projection algorithm, this method uses an appropriate polynomial series to expand the Wigner function and the marginal distribution, and discretize Fourier space. We show that this technique solves most technical difficulties encountered with kernel deconvolution-based methods and reconstructs overall better and smoother Wigner functions. We also give estimators of the reconstruction errors for both methods and show improvement in noise handling properties and resilience to statistical errors.
  • The amplitude-phase coupling effect introduces important dynamic line broadening in modulated semiconductor laser systems. The theory of a new technique allowing measurement of the broadened spectrum using a single laser is presented by the authors. The quantum phase fluctuations of the lasing field are shown to be of great importance on the photocurrent spectrum of the mixed fields. Expressions are derived for the photocurrent spectrum which is shown to measure the optical field modulation power spectrum. Measurement results illustrating the theory are also presented.
  • A novel optical phase-locked loop (OPLL) system for the self-homodyne detection of digitally phase modulated optical signals is introduced. A Mach-Zehnder type interferometer is used to self-homodyne binary phase-modulated optical signals with an external phase modulator inserted in the control arm of the interferometer. 22 refs.
  • Oxide materials are used in numerous applications such as thermal barrier coatings, nuclear fuels, and electrical conductors and sensors, all applications where nanometer-scale stoichiometric changes can affect functional properties. Atom probe tomography can be used to characterize the precise chemical distribution of individual species and spatially quantify the oxygen to metal ratio at the nanometer scale. However, atom probe analysis of oxides can be accompanied by measurement artifacts caused by laser-material interactions. In this investigation, two technologically relevant oxide materials with the same crystal structure and an anion to cation ratio of 2.00, pure cerium oxide (CeO2) and uranium oxidemore » (UO2) are studied. It was determined that electronic structure, optical properties, heat transfer properties, and oxide stability strongly affect their evaporation behavior, thus altering their measured stoichiometry, with thermal conductance and thermodynamic stability being strong factors.« less
  • A second-order optical phase-locked loop was constructed using 1320 nm diode-pumped miniature Nd:YAG ring lasers. Using the loop, a 140 MB/s PSK homodyne transmission experiment has been demonstrated over 28,.6 km of single-mode fiber. With a loop natural frequency of 13 kHz and a damping factor of 0.6, the receiver sensitivity was {minus} 62.8 dBm, or 25 photons/bit.