Direct experimental characterization of the Bose-Einstein distribution of spatial fluctuations of spontaneous parametric down-conversion

Mosset, A.; Devaux, F.; Fanjoux, Gil; Lantz, E.

doi:10.1140/epjd/e2003-00323-2

Cited by 24 publications

(27 citation statements)

References 12 publications

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“…(Accurate measurements of the photon statistics in the high gain regime of PDC are described e.g. in [23].) According to definition (8), it follows therefore that the excess noise coincides with the mean number of photons per mode:…”

Section: Fragility Of Quantum Correlation Toward Imperfect Detectionmentioning

confidence: 99%

High-sensitivity imaging with multi-mode twin beams

et al. 2008

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Twin entangled beams produced by single-pass parametric down-conversion (PDC) offer the opportunity to detect weak amount of absorption with an improved sensitivity with respect to standard techniques which make use of classical light sources. We propose a differential measurement scheme which exploits the spatial quantum correlation of type II PDC to image a weak amplitude object with a sensitivity beyond the standard quantum limit imposed by shot-noise.

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Section: Fragility Of Quantum Correlation Toward Imperfect Detectionmentioning

confidence: 99%

High-sensitivity imaging with multi-mode twin beams

et al. 2008

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“…In the condition of the experiment the pump duration is slightly longer than the PDC coherence time while the pixel area is smaller than the coherence area, so that M is expected to be only slightly larger than unity [31]. Using this, (5) becomes…”

Section: Detection Of Quantum Spatial Correlation: Spatial Analogmentioning

confidence: 99%

Quantum spatial correlations in high-gain parametric down-conversion measured by means of a CCD camera

Jedrkiewicz

Brambilla

Bache

et al. 2006

Journal of Modern Optics

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We consider travelling-wave parametric down-conversion in the high-gain regime and present the experimental demonstration of the quantum character of the spatial fluctuations in the system. In addition to showing the presence of sub-shot noise fluctuations in the intensity difference, we demonstrate that the peak value of the normalized spatial correlations between signal and idler lies well above the line marking the boundary between the classical and the quantum domain. This effect is equivalent to the apparent violation of the Cauchy-Schwartz inequality, predicted by some of us years ago, which represents a spatial analogue of photon antibunching in time. Finally, we analyse numerically the transition from the quantum to the classical regime when the gain is increased and we emphasize the role of the inaccuracy in the determination of the symmetry center of the signal/idler pattern in the far-field plane.

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“…The width of the coherence area in the far field, 0.07 mrad (FWHM), is proportional to the inverse of the width of this beam [19] and is much smaller than the 0.32-mrad lateral size of the CCD pixel. Moreover, the mean number of photons for one spatiotemporal mode is less than 10 −2 , resulting in theoretical Bose-Einstein photon distribution [20] that is undistinguishable from a Poisson distribution. Indeed, the number of amplified temporal modes is approximately 40 [19] and the number of amplified spatial modes on a pixel is on the order of (0.32/0.07) 2 20.…”

Section: Measurement Of Sub-shot-noise Correlations Between Pixelsmentioning

confidence: 99%

Purely spatial coincidences of twin photons in parametric spontaneous down-conversion

et al. 2010

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International audienceWe have measured sub-shot-noise quantum correlations of spatial fluctuations in the far-field image of the parametric fluorescence created in a type I β-barium-borate nonlinear crystal, either between opposite angular sectors (nondegenerate configuration) or between opposite pixels (degenerate configuration). Imaging is performed at a very low light level (0.2 photons per pixel) with an electron-multiplying CCD camera, resulting in purely spatial coincidences between single photons when detecting on pixels. Experimental results overcome the standard quantum-limit-shot-noise level without subtraction of the variance of the detection noise. We compare these experimental results with numerical results given by the quantum Green's function method, which is proved to have strong advantages over stochastic simulations

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Direct experimental characterization of the Bose-Einstein distribution of spatial fluctuations of spontaneous parametric down-conversion

Cited by 24 publications

References 12 publications

High-sensitivity imaging with multi-mode twin beams

High-sensitivity imaging with multi-mode twin beams

Quantum spatial correlations in high-gain parametric down-conversion measured by means of a CCD camera

Purely spatial coincidences of twin photons in parametric spontaneous down-conversion

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