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

arXiv:quant-ph/0409054 · Optics and Spectroscopy

Review of recent experimental progress in foundations of quantum mechanics and quantum information achieved in parametric downconversion experiments at IENGF

Marco Genovese, G. Brida, E. Cagliero, Marco Gramegna, E. Predazzi

Published Aug 1, 2005• 4 citations
arXivHTMLPDF

Abstract

We review some recent experimental progress concerning foundations of quantum mechanics and quantum information obtained in the Carlo Novero Quantum Optics Laboratory at IENGF. After a short presentation of our polarization-entangled photon source (based on precise superposition of two type I PDC emissions) and of the results obtained with it, we describe in more detail an innovative double slit experiment where two degenerate photons produced by PDC are each sent to a specific slit. Beyond representing an interesting example of the relation between the visibility of interference and welcher Weg knowledge, this configuration has been suggested for testing de Broglie-Bohm theory (dBB) against standard quantum mechanics (SQM). Our results perfectly fit SQM results but disagree with dBB predictions. Then, we discuss a recent experiment addressed at clarifying the issue of which wave-particle observables are really to be considered when discussing wave-particle duality. This experiments realizes the theoretical proposal of Agarwal et al. , overcoming the limitations of a previous experiment. Finally, we hint at the realization of a high-intensity high-spectral-selectivity PDC source to be used for quantum information studies.

DOI
10.1134/1.2034600

Related papers

Review of studies about quantum communication and foundations of quantum mechanics at IENGF

Marco Genovese

In this proceeding I review the main experimental results obtained at IENGF (Turin, Italy) by using a source of entangled photons realised superposing, by means of an optical condenser, type I PDC produced in two crystals. More in details, after having described how this source is built, I will report on a Bell inequalities test obtained with it. Then I describe a recent innovative double slit experiment realised with a similar scheme. Finally, I hint about future developments of this activity at IENGF and in particular about a quantum cryptographic scheme in d=4.

arXiv:quant-ph/0309160•Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Feb 3, 2004•0 citations

Experimental realization of a first test of de Broglie Bohm theory

G. Brida, E. Cagliero, Giuseppe Falzetta +3 more

Quantum mechanics is a pillar of modern physics, confirmed by a huge number of experiments. Nevertheless, it presents many unintuitive properties, strongly differing from classical mechanics due to its intrinsic non-epistemic probabilistic nature. Many attempts have been devoted to building a deterministic theory reproducing all the results of standard quantum mechanics (SQM). One of the most successful attempts, in this sense, is de Broglie–Bohm (dBB) theory. This theory is built in order to reproduce almost all SQM predictions. However, it has recently been suggested that different coincidence patterns are predicted by SQM and dBB when a double-slit experiment is realized under specific conditions. In this paper we present the first realization of such a double-slit experiment with correlated photons produced in type I parametric down-conversion. We observe a perfect agreement with SQM prediction, whilst our result is almost eight standard deviations from the dBB prediction.

arXiv:quant-ph/0206196•Journal of Physics B Atomic Molecular and Optical Physics•Nov 7, 2002•70 citations

Recent progresses at IENGF on studies on quantum information

G. Brida, E. Cagliero, Marco Genovese +2 more

In this proceeding we present the most recent studies performed at IEN "Galileo Ferraris" on quantum information by using quantum optical states. After a general summary of the most recent studies, among them we will present in some details the results of two recent experiments. The first was addressed to tomographic reconstruction of a quantum state by using an innovative theoretical scheme based on a variable quantum efficiency of the detector. This scheme has been applied to Fock (PDC heralded photons), coherent (attenuated laser beam) and thermal states, for which experimental results will be presented. The second was pointed to experimentally investigate the effects of fibre propagation of PDC light produced in a type II crystal and, in particular, to the restoration of entanglement due to wave packet dispersion. Also in this case we will present and discuss our most recent data. Finally, we will shortly acknowledge of realisation of a heralded photon source with strong spectral selection.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Aug 18, 2005•0 citations

Biphoton double-slit experiment

G. Brida, E. Cagliero, Giuseppe Falzetta +3 more

In this paper we present a double-slit experiment where two indistinguishable photons produced by type-I parametric down-conversion are each sent to a well-defined slit. Data about the diffraction and interference patterns for coincidences are presented and discussed. An analysis of these data allows a test of standard quantum mechanics against the de Broglie--Bohm theory.

arXiv:quant-ph/0310020•Physical Review A•Sep 11, 2003•87 citations

An innovative biphoton double slit experiment

G. Brida, E. Cagliero, Marco Genovese +4 more

We report on a double slit experiment where indistinguishable correlated photons generated through spontaneous parametric down-conversion, are each sent to a well-defined slit. An analysis of the results allows a test of de Broglie-Bohm mechanics against standard quantum mechanics.

Journal of Modern Optics•Apr 1, 2004•4 citations

Recent experimental progresses in testing Quantum Mechanics

G. Brida, Marco Genovese, Fabrizio Piacentini

In this paper we will show some recent experiments performed in the "Carlo Novero" labs of the Optics Division of the National Institute of Metrological Research (INRIM, Torino, Italy), in order to discriminate between Standard Quantum Mechanics and some specific, restricted class of Hidden Variable Theories (HVTs). The first experiment will be on the testing of two restricted Local Realistic Theories (LRTs) [1, 2], properly built to describe polarization entangled photons experiments, whose inequalities are not affected by the detection loophole. The second and third experiments instead will perform the Alicki – Van Ryn non-classicality test [3] on single particles, by means of two different setups based on heralded single photon sources.

Journal of Physics Conference Series•Jul 8, 2011•2 citations
We review some recent experimental progress concerning foundations of quantum mechanics and quantum information obtained in the Carlo Novero Quantum Optics Laboratory at IENGF. After a short presentation of our polarization-entangled photon source (based on precise superposition of two type I PDC emissions) and of the results obtained with it, we describe in more detail an innovative double slit experiment where two degenerate photons produced by PDC are each sent to a specific slit. Beyond representing an interesting example of the relation between the visibility of interference and welcher Weg knowledge, this configuration has been suggested for testing de Broglie-Bohm theory (dBB) against standard quantum mechanics (SQM). Our results perfectly fit SQM results but disagree with dBB predictions. Then, we discuss a recent experiment addressed at clarifying the issue of which wave-particle observables are really to be considered when discussing wave-particle duality. This experiments realizes the theoretical proposal of Agarwal et al. , overcoming the limitations of a previous experiment. Finally, we hint at the realization of a high-intensity high-spectral-selectivity PDC source to be used for quantum information studies.
In this proceeding I review the main experimental results obtained at IENGF (Turin, Italy) by using a source of entangled photons realised superposing, by means of an optical condenser, type I PDC produced in two crystals. More in details, after having described how this source is built, I will report on a Bell inequalities test obtained with it. Then I describe a recent innovative double slit experiment realised with a similar scheme. Finally, I hint about future developments of this activity at IENGF and in particular about a quantum cryptographic scheme in d=4.
Quantum mechanics is a pillar of modern physics, confirmed by a huge number of experiments. Nevertheless, it presents many unintuitive properties, strongly differing from classical mechanics due to its intrinsic non-epistemic probabilistic nature. Many attempts have been devoted to building a deterministic theory reproducing all the results of standard quantum mechanics (SQM). One of the most successful attempts, in this sense, is de Broglie–Bohm (dBB) theory. This theory is built in order to reproduce almost all SQM predictions. However, it has recently been suggested that different coincidence patterns are predicted by SQM and dBB when a double-slit experiment is realized under specific conditions. In this paper we present the first realization of such a double-slit experiment with correlated photons produced in type I parametric down-conversion. We observe a perfect agreement with SQM prediction, whilst our result is almost eight standard deviations from the dBB prediction.
In this proceeding we present the most recent studies performed at IEN "Galileo Ferraris" on quantum information by using quantum optical states. After a general summary of the most recent studies, among them we will present in some details the results of two recent experiments. The first was addressed to tomographic reconstruction of a quantum state by using an innovative theoretical scheme based on a variable quantum efficiency of the detector. This scheme has been applied to Fock (PDC heralded photons), coherent (attenuated laser beam) and thermal states, for which experimental results will be presented. The second was pointed to experimentally investigate the effects of fibre propagation of PDC light produced in a type II crystal and, in particular, to the restoration of entanglement due to wave packet dispersion. Also in this case we will present and discuss our most recent data. Finally, we will shortly acknowledge of realisation of a heralded photon source with strong spectral selection.
In this paper we will show some recent experiments performed in the "Carlo Novero" labs of the Optics Division of the National Institute of Metrological Research (INRIM, Torino, Italy), in order to discriminate between Standard Quantum Mechanics and some specific, restricted class of Hidden Variable Theories (HVTs). The first experiment will be on the testing of two restricted Local Realistic Theories (LRTs) [1, 2], properly built to describe polarization entangled photons experiments, whose inequalities are not affected by the detection loophole. The second and third experiments instead will perform the Alicki – Van Ryn non-classicality test [3] on single particles, by means of two different setups based on heralded single photon sources.