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Classical Imaging with Undetected Photons

Author(s)
Shapiro, Jeffrey H.; Venkatraman, Dheera; Wong, Franco N. C.
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Abstract
Barreto Lemos et al. [Nature 512, 409–412 (2014)] reported an experiment in which a non-degenerate parametric downconverter and a non-degenerate optical parametric amplifier—used as a wavelength-converting phase conjugator—were employed to image object transparencies in a manner akin to ghost imaging. Their experiment, however, relied on single-photon detection, rather than the photon-coincidence measurements employed in ghost imaging with a parametric downconverter source. More importantly, their system formed images despite the photons that passed through the object never being detected. Barreto Lemos et al. interpreted their experiment as a quantum imager, as assuredly it is, owing to its downconverter’s emitting entangled signal and idler beams. We show, however, that virtually all the features of their setup can be realized in a quantum-mimetic fashion using classical-state light, specifically a pair of bright pseudothermal beams possessing a phase-sensitive cross correlation. Owing to its much higher signal-to-noise ratio, our bright-source classical imager could greatly reduce image-acquisition time compared to that of Barreto Lemos et al.‘s quantum system, while retaining the latter’s ability to image with undetected photons.
Date issued
2015-05
URI
http://hdl.handle.net/1721.1/98442
Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Research Laboratory of Electronics
Journal
Scientific Reports
Publisher
Nature Publishing Group
Citation
Shapiro, Jeffrey H., Dheera Venkatraman, and Franco N. C. Wong. “Classical Imaging with Undetected Photons.” Scientific Reports 5 (May 27, 2015): 10329.
Version: Final published version
ISSN
2045-2322

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