Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

European Quantum Electronics Conference (EQEC)

Detection of quantum spatial correlation in high-gain parametric down-conversion

Ottavia Jedrkiewicz, A. Gatti, E. Brambilla, Morten Bache, Luigi A. Lugiato, P. Di Trapani, Y.-K. Jiang

Published Jan 18, 2006• 0 citations
Publisher

Abstract

This work reports on the first quantum spatial measurements of parametric down-conversion (PDC) radiation performed by using a 2 Hz-pulsed high-power laser (1 GW-1 ps).
DOI
10.1109/eqec.2005.1567421

Related papers

Single-shot detection of spatial quantum correlation in high-gain parametric down-conversion

Ottavia Jedrkiewicz, A. Gatti, E. Brambilla +4 more

Using a 1GW-1ps pump-laser pulse in parametric down-conversion allows for single-shot detection of spatial quantum correlation with up to hundreds of photons per mode. The statistics is performed over independent spatial replica of the system.

Conference on Lasers and Electro-Optics•Jan 1, 2004•0 citations

Detection of Sub-Shot-Noise Spatial Correlation in High-Gain Parametric Down Conversion

Ottavia Jedrkiewicz, Yun-Kun Jiang, E. Brambilla +4 more

Using a 1 GW, 1 ps pump laser pulse in high-gain parametric down conversion allows us to detect sub-shot-noise spatial quantum correlation with up to 100 photoelectrons per mode by means of a high efficiency charge coupled device. The statistics is performed in single shot over independent spatial replica of the system. Evident quantum correlations were observed between symmetrical signal and idler spatial areas in the far field. In accordance with the predictions of numerical calculations, the observed transition from the quantum to the classical regime is interpreted as a consequence of the narrowing of the down-converted beams in the very high-gain regime.

arXiv:quant-ph/0407211•Physical Review Letters•Dec 6, 2004•206 citations

Exploiting PDC spatial correlations for innovative quantum imaging protocols

Marco Genovese, G. Brida, Alice Meda +1 more

Quantum properties of the optical field represent a resource of the utmost relevance for the development of quantum technologies, allowing unprecedented results in disciplines ranging from quantum information and metrology to quantum imaging. Spatial quantum correlations generated by of parametric down conversion (PDC) represents a tool for quantum imaging because they are intrinsically multimode, a requirement for obtaining large degree of correlation over small portions of the beams, allowing to register the spatial structure of an object. In particular a very interesting example is provided by the detection of weak objects, a result that could have important practical applications. The principle of this technique is to take advantage of the correlation in the noise of two conjugated branches of PDC emission: in fact, subtracting the noise measured on one branch from the image of a weak object obtained in the other branch, the image of the object, eventually previously hidden in the noise, could be restored. Here, after a general summary of quantum imaging techniques, firstly we will show how we have reached a sub shot noise regime and then improved this result up to reach a regime where it was possible to achieve the first experimental realisation of sub shot noise imaging of a weak absorbing object.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Aug 16, 2011•1 citation

Bandwidth-Dependent and Other Types of Two-Photon Quantum Correlations in Parametric Down Conversion

Thomas E. Kiess

•Jan 1, 1993•0 citations

The interference of signal and idler waves in parametric down-conversion

L. A. Lugiato, E. Brambilla, A. Gatti

We focus on Type I materials, in the regime of high gain. Following the quantum image approach, we show that the spatial correlation function of quadrature components displays the quantum features of the interference.

International Conference on Quantum Information•Jan 1, 2007•0 citations

Direct detection of the idler THz radiation generated by spontaneous parametric down-conversion

G. Kh. Kitaeva, Vladimir V. Kornienko, Kirill A. Kuznetsov +3 more

We study parametric down-conversion (PDC) of optical laser radiation in the strongly frequency non-degenerate regime which is promising for the generation of quantum-correlated pairs of extremely different spectral ranges, the optical and the terahertz (THz) ones. The possibility to detect tenuous THz-frequency photon fluxes generated under low-gain spontaneous PDC is demonstrated using a hot electron bolometer. Then experimental dependences of the THz radiation power on the detection angle and on the pump intensity are analyzed.

Optics Letters•Feb 21, 2019•21 citations
Using a 1 GW, 1 ps pump laser pulse in high-gain parametric down conversion allows us to detect sub-shot-noise spatial quantum correlation with up to 100 photoelectrons per mode by means of a high efficiency charge coupled device. The statistics is performed in single shot over independent spatial replica of the system. Evident quantum correlations were observed between symmetrical signal and idler spatial areas in the far field. In accordance with the predictions of numerical calculations, the observed transition from the quantum to the classical regime is interpreted as a consequence of the narrowing of the down-converted beams in the very high-gain regime.
Quantum properties of the optical field represent a resource of the utmost relevance for the development of quantum technologies, allowing unprecedented results in disciplines ranging from quantum information and metrology to quantum imaging. Spatial quantum correlations generated by of parametric down conversion (PDC) represents a tool for quantum imaging because they are intrinsically multimode, a requirement for obtaining large degree of correlation over small portions of the beams, allowing to register the spatial structure of an object. In particular a very interesting example is provided by the detection of weak objects, a result that could have important practical applications. The principle of this technique is to take advantage of the correlation in the noise of two conjugated branches of PDC emission: in fact, subtracting the noise measured on one branch from the image of a weak object obtained in the other branch, the image of the object, eventually previously hidden in the noise, could be restored. Here, after a general summary of quantum imaging techniques, firstly we will show how we have reached a sub shot noise regime and then improved this result up to reach a regime where it was possible to achieve the first experimental realisation of sub shot noise imaging of a weak absorbing object.
We study parametric down-conversion (PDC) of optical laser radiation in the strongly frequency non-degenerate regime which is promising for the generation of quantum-correlated pairs of extremely different spectral ranges, the optical and the terahertz (THz) ones. The possibility to detect tenuous THz-frequency photon fluxes generated under low-gain spontaneous PDC is demonstrated using a hot electron bolometer. Then experimental dependences of the THz radiation power on the detection angle and on the pump intensity are analyzed.