Classical far-field phase-sensitive ghost imaging

Venkatraman, Dheera; Hardy, Nicholas D.; Wong, Franco N. C.; Shapiro, Jeffrey H.

doi:10.1364/ol.36.003684

Cited by 12 publications

(10 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A somewhat different situation transpires when SPDC sources are used in imagers. Here, previous work on ghost imaging 13 14 and optical coherence tomography 15 16 has shown that almost all of the features of SPDC-based systems can be realized with quantum-mimetic counterparts that use classical-state light, namely pseudothermal signal and idler beams with a phase-sensitive cross correlation. We have demonstrated the same to be true for Barreto Lemos et al ‘s quantum imaging with undetected photons 17 .…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Classical Imaging with Undetected Photons

Shapiro

Venkatraman

Wong

2015

Sci Rep

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Discussionmentioning

confidence: 99%

“… 13 showed theoretically, and Ref. 14 verified experimentally, that signal and idler beams in a zero-mean jointly Gaussian classical state—determined by their non-zero phase-insensitive auto-correlations and phase-sensitive cross-correlation—yielded ghost images with almost all of the properties of the quantum case.…”

mentioning

confidence: 91%

Classical Imaging with Undetected Photons

Shapiro

Venkatraman

Wong

2015

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…125 and implemented by Venkatraman et al in Ref. 26. Here a pseudorandom number generator (PRNG) applies a sequence of phase maps to the K × K pixels of an SLM, one map for each of M normally-incident plane-wave laser pulses that illuminate the SLM.…”

Section: Resultsmentioning

confidence: 99%

“…4(a) was also used to demonstrate phase-sensitive classical ghost imaging in Ref. 26 by programming SLM2 with the exact SLM1-complementary pattern to generate phase-sensitive cross correlations between the signal and reference beams.…”

Section: Methodsmentioning

confidence: 99%

Ghost Imaging without Discord

Shapiro

Venkatraman

Wong

2013

Sci Rep

Self Cite

View full text Add to dashboard Cite

Ragy and Adesso argue that quantum discord is involved in the formation of a pseudothermal ghost image. We show that quantum discord plays no role in spatial light modulator ghost imaging, i.e., ghost-image formation based on structured illumination realized with laser light that has undergone spatial light modulation by the output from a pseudorandom number generator. Our analysis thus casts doubt on the degree to which quantum discord is necessary for ghost imaging.

show abstract

“…A somewhat different situation transpires when SPDC sources are used in imagers. Here, previous work on ghost imaging 13,14 and optical coherence tomography 15,16 has shown that almost all of the features of SPDC-based systems can be realized with quantum-mimetic counterparts that use classical-state light, namely pseudothermal signal and idler beams with a phase-sensitive cross correlation. We have demonstrated the same to be true for Barreto Lemos et al's quantum imaging with undetected photons 17 .…”

Section: Discussionmentioning

confidence: 99%

Classical Imaging with Undetected Photons

2015

Self Cite

View full text Add to dashboard Cite

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 wavelengthconverting 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 phasesensitive 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.Light is intrinsically quantum mechanical, and photodetection is a quantum measurement. Consequently, all imaging is really quantum mechanical. It has long been known, however, that the semiclassical theory of photodetection-in which light is a classical field and the discreteness of the electron charge results in photodetection shot noise-predicts measurement statistics identical to those obtained from quantum theory when the illumination is in a classical state, namely a Glauber coherent state or a classically-random mixture of such states. (See Ref. 1 for a review of quantum versus semiclassical photodetection.) Thus, because experiments whose quantitative behavior is correctly predicted by two disparate theories cannot distinguish between those two theories, it is entirely appropriate that the term quantum imaging be reserved for imagers whose quantitative understanding requires the use of quantum theory. (See Refs. 2-4 for how a debate on this point has been settled with regards to pseudothermal ghost imaging.)Three-wave mixing in a second-order nonlinear material is the workhorse of nonclassical light-beam generation, with spontaneous parametric downconverters producing entangled signal and idler beams 5 , optical parametric amplifiers producing squeezed-vacuum states 6 , and optical parametric oscillators producing photon-twin beams 7 . It follows that imagers using any such sources will be quantum imagers, according to the criterion described in the preceding paragraph. Two such examples are the initial ghost-imaging experiment 8 , and quantum optical coherence tomography (Q-OCT) 9,10 . Both used continuous-wave (cw) spontaneous parametric downconversion (SPDC) sources, whose signal and idler outputs were taken to comprise streams of biphotons detectable by photon-coincidence c...

show abstract

Classical far-field phase-sensitive ghost imaging

Cited by 12 publications

References 6 publications

Classical Imaging with Undetected Photons

Classical Imaging with Undetected Photons

Ghost Imaging without Discord

Classical Imaging with Undetected Photons

Contact Info

Product

Resources

About