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Quantum-Atom Optics Downunder (QAO)

Seeded Parametric Downconversion for Quantum Ghost imaging

Stefania Castelletto, R. Lowden, Robert E Scholten, Ann Roberts, Ivo Pietro Degiovanni, E. Puddu, Maria Bondani, Alessandra Andreoni

Published Jan 1, 2007• 0 citations
Publisher

Abstract

In this paper we propose a novel source to study the role of spatial and intensity quantum correlation in ghost imaging. By seeding a parametric down-conversion (PDC) source with a pseudo thermal source the output transforms in a two-photon field, whose correlation properties can be tuned by changing the seed field intensity and its spatial coherence. This source can be used to explore experimental configurations not covered so far by classical and quantum ghost imaging experiments.

DOI
10.1364/qao.2007.qme35

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In this paper we propose a novel source to study the role of spatial and intensity quantum correlation in ghost imaging. By seeding a parametric down-conversion (PDC) source with a pseudo thermal source the output transforms in a two-photon field, whose correlation properties can be tuned by changing the seed field intensity and its spatial coherence. This source can be used to explore experimental configurations not covered so far by classical and quantum ghost imaging experiments.
We address parametric down-conversion seeded by multimode pseudothermal fields. We show that this process may be used to generate multimode pairwise correlated states with entanglement properties that can be tuned by controlling the seed intensities. Parametric down-conversion seeded by multimode pseudothermal fields represents a source of correlated states, which allows one to explore the classical-quantum transition in pairwise correlations and to realize ghost imaging and ghost diffraction in regimes not yet explored by experiments.
We have studied a correlated imaging scheme using parametric downconversion stimulated with a partially coherent beam as a source. We analyze the dependence of quantum spatial correlations and image reconstruction features on the crystal length, the coherence length, and the transverse size of the seed beam in low- and high-gain regimes of parametric downconversion. We show that the visibility of ghost interference can be adjusted by varying the intensity and/or the coherence length of the seed, with improved visibility in the high-gain regime, and a visibility greater than 0.5 in the low-gain regime.
We analytically show that it is possible to perform coherent imaging by using the classical correlation of two beams obtained by splitting incoherent thermal radiation. A formal analogy is demonstrated between two such classically correlated beams and two entangled beams produced by parametric down-conversion. Because of this analogy, the classical beams can mimic qualitatively all the imaging properties of the entangled beams, even in ways which up to now were not believed possible. A key feature is that these classical beams are spatially correlated both in the near-field and in the far-field. Using realistic numerical simulations the performances of a quasi-thermal and a parametric down-conversion source are shown to be closely similar, both for what concerns the resolution and statistical properties. The results of this paper provide a new scenario for the discussion of what role the entanglement plays in correlated imaging.