The physics of ghost imaging

The physics of ghost imaging Ghost images are obtained by correlating the output of a single-pixel (bucket) photodetector—which collects light that has been transmitted through or reflected from an object—with the output from a high spatial-resolution scanning photodetector or photodetector array whose illumination has not interacted with that object. The term “ghost image” is apt because neither detector’s output alone can yield an image: the bucket detector has no spatial resolution, while the high spatial-resolution detector has not viewed the object. The first ghost imaging experiment relied on the entangled signal and idler outputs from a spontaneous parametric downconverter, and hence the image was interpreted as a quantum phenomenon. Subsequent theory and experiments showed, however, that classical correlations can be used to form ghost images. For example, ghost images can be formed with pseudothermal light, for which quantum mechanics is not required to characterize its photodetection statistics. This paper presents an overview of the physics of ghost imaging. It clarifies and unites two disparate interpretations of pseudothermal ghost imaging—two-photon interference and classical intensity-fluctuation correlations—that had previously been thought to be conflicting. It also reviews recent work on ghost imaging in reflection, ghost imaging through atmospheric turbulence, computational ghost imaging, and two-color ghost imaging. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Quantum Information Processing Springer Journals

The physics of ghost imaging

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Publisher
Springer US
Copyright
Copyright © 2012 by Springer Science+Business Media, LLC
Subject
Physics; Mathematical Physics; Quantum Computing; Quantum Information Technology, Spintronics; Data Structures, Cryptology and Information Theory; Quantum Physics
ISSN
1570-0755
eISSN
1573-1332
D.O.I.
10.1007/s11128-011-0356-5
Publisher site
See Article on Publisher Site

Abstract

Ghost images are obtained by correlating the output of a single-pixel (bucket) photodetector—which collects light that has been transmitted through or reflected from an object—with the output from a high spatial-resolution scanning photodetector or photodetector array whose illumination has not interacted with that object. The term “ghost image” is apt because neither detector’s output alone can yield an image: the bucket detector has no spatial resolution, while the high spatial-resolution detector has not viewed the object. The first ghost imaging experiment relied on the entangled signal and idler outputs from a spontaneous parametric downconverter, and hence the image was interpreted as a quantum phenomenon. Subsequent theory and experiments showed, however, that classical correlations can be used to form ghost images. For example, ghost images can be formed with pseudothermal light, for which quantum mechanics is not required to characterize its photodetection statistics. This paper presents an overview of the physics of ghost imaging. It clarifies and unites two disparate interpretations of pseudothermal ghost imaging—two-photon interference and classical intensity-fluctuation correlations—that had previously been thought to be conflicting. It also reviews recent work on ghost imaging in reflection, ghost imaging through atmospheric turbulence, computational ghost imaging, and two-color ghost imaging.

Journal

Quantum Information ProcessingSpringer Journals

Published: Jan 14, 2012

References

  • Correlated imaging, quantum and classical
    Gatti, A.; Brambilla, E.; Bache, M.; Lugiato, L.A.
  • High-resolution ghost image and ghost diffraction experiments with thermal light
    Ferri, F.; Magatti, D.; Gatti, A.; Bache, M.; Brambilla, E.; Lugiato, L.A.
  • The quantum theory of optical communications
    Shapiro, J.H.; Shapiro, J.H.
  • Ghost-imaging experiment by measuring reflected photons
    Meyers, R.; Deacon, K.S.; Shih, Y.
  • Quantum imaging of an obscured object by measurement of reflected photons
    Meyers, R.E.; Deacon, K.S.; Shih, Y.
  • Quantum ghost imaging experiments at ARL
    Meyers, R.E.; Deacon, K.S.
  • Ghost imaging through turbulent atmosphere
    Cheng, J.
  • Ghost imaging with a single detector
    Bromberg, Y.; Katz, O.; Silberberg, Y.
  • Two-color ghost imaging
    Chan, K.W.C.; O’Sullivan, M.N.; Boyd, R.W.
  • Observation of two-color ghost imaging
    Karmakar, S.; Shih, Y.
  • Comparison of the signal-to-noise characteristics of quantum versus thermal ghost imaging
    O’Sullivan, M.N.; Chan, K.W.C.; Boyd, R.W.

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