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Papers by Alessandra Gatti
Journal de Physique IV (Proceedings), 2004
Nous nous intéressons au comportement spatial des fluctuations quantiques à la sortie d&#... more Nous nous intéressons au comportement spatial des fluctuations quantiques à la sortie d'un oscillateur paramétrique optique dégénéré en modes transverses, sous le seuil. En vue de futures expériences, nous étudions les effets de la diffraction dans le milieu paramétrique sur le bruit quantique spatial. Nous montrons que l'on voit apparaître une aire de cohérence de taille finie pour les effets
The European Physical Journal D, 2012
ABSTRACT We calculate the Schmidt number for a two-dimensional model of the nonfactorable spatiot... more ABSTRACT We calculate the Schmidt number for a two-dimensional model of the nonfactorable spatiotemporal wave-function of biphotons produced in type-I spontaneous parametric down-conversion with degenerate and collinear phase-matching taking into consideration a major part of the broad spectral and angular bandwidth of the down-converted light. We deduce an analytical expression for the Schmidt number as a function of the filter bandwidth in the limit of spectrally narrow pump and consider a possibility of tailoring a Gaussian model for the description of this kind of entanglement.
Quantum Communications and Quantum Imaging V, 2007
We review and compare the results of quantum spatial correlation measurements in parametric down-... more We review and compare the results of quantum spatial correlation measurements in parametric down-conversion in the high-gain pulsed regime, with preliminary measurements performed in the low-gain cw-pumped regime. The diagnostics is based on a high quantum efficiency CCD camera, and in the second case the radiation pattern is recorded after temporal integration of the "single-photon" spatial distribution. The effect of
Optics express, Jan 20, 1998
We investigate the formation of transverse patterns in a doubly resonant degenerate optical param... more We investigate the formation of transverse patterns in a doubly resonant degenerate optical parametric oscillator. Extending previous work, we treat the more realistic case of a spherical mirror cavity with a finite-sized input pump field. Using numerical simulations in real space, we determine the conditions on the cavity geometry, pump size and detunings for which pattern formation occurs; we find multistability of different types of optical patterns. Below threshold, we analyze the dependence of the quantum image on the width of the input field, in the near and in the far field.
EQEC '05. European Quantum Electronics Conference, 2005., 2005
Summary We discuss spontaneous pattern formation in the radiation field emitted by a degenerate ... more Summary We discuss spontaneous pattern formation in the radiation field emitted by a degenerate optical parametric oscillator and illustrate various quantum effects in these patterns. Above threshold, we find the presence of perfect photonic correlations in the spatial structure, and we describe a phenomenon that we call «quantum image». We show that these effects are related to the wave and particle
2011 IEEE Photonics Society Summer Topical Meeting Series, 2011
ABSTRACT As in the case of quantum information and communication, in the field of quantum imaging... more ABSTRACT As in the case of quantum information and communication, in the field of quantum imaging entanglement represents an invaluable resource. Processes such as parametric down-conversion (PDC) and four-wave mixing provide natural sources of quantum entangled beams endowed with spatial entanglement properties that are useful in quantum imaging. The authors will review these well known features in the case of PDC, and the technique which allows for an imaging with a sensitivity beyond the standard quantum limit, which has been theoretically predicted and experimentally demonstrated.
Il Nuovo Cimento B, 1995
Summary We discuss spontaneous pattern formation in the radiation field emitted by a degenerate ... more Summary We discuss spontaneous pattern formation in the radiation field emitted by a degenerate optical parametric oscillator and illustrate various quantum effects in these patterns. Above threshold, we find the presence of perfect photonic correlations in the spatial structure, and we describe a phenomenon that we call «quantum image». We show that these effects are related to the wave and particle
Physical Review Letters, 2005
Physical Review Letters, 2010
Physical Review Letters, 2012
This work presents the experimental observation of the nonfactorable near-field spatiotemporal co... more This work presents the experimental observation of the nonfactorable near-field spatiotemporal correlation of ultrabroadband twin beams generated by parametric down-conversion, in an interferometric-type experiment using sum frequency generation, where both the temporal and the spatial degrees of freedom of parametric down-conversion light are controlled with high resolution. The revealed correlation is skewed in space-time in accordance with the X structure predicted by the theory.
Physical Review Letters, 2012
Physical Review A, 1997
Langevin treatment of quantum fluctuations and optical patterns in optical parametric oscillators... more Langevin treatment of quantum fluctuations and optical patterns in optical parametric oscillators below threshold. A. Gatti, H. Wiedemann, LA Lugiato, and I. Marzoli Istituto Nazionale per la Fisica della Materia, Dipartimento di ...
Journal de Physique IV (Proceedings), 2004
Nous nous intéressons au comportement spatial des fluctuations quantiques à la sortie d&#... more Nous nous intéressons au comportement spatial des fluctuations quantiques à la sortie d'un oscillateur paramétrique optique dégénéré en modes transverses, sous le seuil. En vue de futures expériences, nous étudions les effets de la diffraction dans le milieu paramétrique sur le bruit quantique spatial. Nous montrons que l'on voit apparaître une aire de cohérence de taille finie pour les effets
The European Physical Journal D, 2012
ABSTRACT We calculate the Schmidt number for a two-dimensional model of the nonfactorable spatiot... more ABSTRACT We calculate the Schmidt number for a two-dimensional model of the nonfactorable spatiotemporal wave-function of biphotons produced in type-I spontaneous parametric down-conversion with degenerate and collinear phase-matching taking into consideration a major part of the broad spectral and angular bandwidth of the down-converted light. We deduce an analytical expression for the Schmidt number as a function of the filter bandwidth in the limit of spectrally narrow pump and consider a possibility of tailoring a Gaussian model for the description of this kind of entanglement.
Quantum Communications and Quantum Imaging V, 2007
We review and compare the results of quantum spatial correlation measurements in parametric down-... more We review and compare the results of quantum spatial correlation measurements in parametric down-conversion in the high-gain pulsed regime, with preliminary measurements performed in the low-gain cw-pumped regime. The diagnostics is based on a high quantum efficiency CCD camera, and in the second case the radiation pattern is recorded after temporal integration of the "single-photon" spatial distribution. The effect of
Optics express, Jan 20, 1998
We investigate the formation of transverse patterns in a doubly resonant degenerate optical param... more We investigate the formation of transverse patterns in a doubly resonant degenerate optical parametric oscillator. Extending previous work, we treat the more realistic case of a spherical mirror cavity with a finite-sized input pump field. Using numerical simulations in real space, we determine the conditions on the cavity geometry, pump size and detunings for which pattern formation occurs; we find multistability of different types of optical patterns. Below threshold, we analyze the dependence of the quantum image on the width of the input field, in the near and in the far field.
EQEC '05. European Quantum Electronics Conference, 2005., 2005
Summary We discuss spontaneous pattern formation in the radiation field emitted by a degenerate ... more Summary We discuss spontaneous pattern formation in the radiation field emitted by a degenerate optical parametric oscillator and illustrate various quantum effects in these patterns. Above threshold, we find the presence of perfect photonic correlations in the spatial structure, and we describe a phenomenon that we call «quantum image». We show that these effects are related to the wave and particle
2011 IEEE Photonics Society Summer Topical Meeting Series, 2011
ABSTRACT As in the case of quantum information and communication, in the field of quantum imaging... more ABSTRACT As in the case of quantum information and communication, in the field of quantum imaging entanglement represents an invaluable resource. Processes such as parametric down-conversion (PDC) and four-wave mixing provide natural sources of quantum entangled beams endowed with spatial entanglement properties that are useful in quantum imaging. The authors will review these well known features in the case of PDC, and the technique which allows for an imaging with a sensitivity beyond the standard quantum limit, which has been theoretically predicted and experimentally demonstrated.
Il Nuovo Cimento B, 1995
Summary We discuss spontaneous pattern formation in the radiation field emitted by a degenerate ... more Summary We discuss spontaneous pattern formation in the radiation field emitted by a degenerate optical parametric oscillator and illustrate various quantum effects in these patterns. Above threshold, we find the presence of perfect photonic correlations in the spatial structure, and we describe a phenomenon that we call «quantum image». We show that these effects are related to the wave and particle
Physical Review Letters, 2005
Physical Review Letters, 2010
Physical Review Letters, 2012
This work presents the experimental observation of the nonfactorable near-field spatiotemporal co... more This work presents the experimental observation of the nonfactorable near-field spatiotemporal correlation of ultrabroadband twin beams generated by parametric down-conversion, in an interferometric-type experiment using sum frequency generation, where both the temporal and the spatial degrees of freedom of parametric down-conversion light are controlled with high resolution. The revealed correlation is skewed in space-time in accordance with the X structure predicted by the theory.
Physical Review Letters, 2012
Physical Review A, 1997
Langevin treatment of quantum fluctuations and optical patterns in optical parametric oscillators... more Langevin treatment of quantum fluctuations and optical patterns in optical parametric oscillators below threshold. A. Gatti, H. Wiedemann, LA Lugiato, and I. Marzoli Istituto Nazionale per la Fisica della Materia, Dipartimento di ...