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Acta Sinica Quantum Optica

Role of Quantum Entanglement and Classical Correlation in Two-photon Imaging

Ping‐Xing Chen

Published Jan 1, 2009• 0 citations
OpenAlex

Abstract

The correlated imaging is an interesting topic.Whether second correlated imaging is a pure quantum effect or classical effect is still implicit.One phenomenon of quantum theory or classical theory,which is an interesting topic.This paper analyses three correlated imaging schemes together.The first two schemes can be achieved by two-photon which is classical correlated or quantum entangled and the third one can only be achieved by entangled two-photon.Through the comparison of these schemes,we find that entangled two-photon which can be used in all the three schemes is correlated both in position and momentum.However,the classical correlated two-photon only correlate in position or momentum,and only can be used in one scheme.

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The correlated imaging is an interesting topic.Whether second correlated imaging is a pure quantum effect or classical effect is still implicit.One phenomenon of quantum theory or classical theory,which is an interesting topic.This paper analyses three correlated imaging schemes together.The first two schemes can be achieved by two-photon which is classical correlated or quantum entangled and the third one can only be achieved by entangled two-photon.Through the comparison of these schemes,we find that entangled two-photon which can be used in all the three schemes is correlated both in position and momentum.However,the classical correlated two-photon only correlate in position or momentum,and only can be used in one scheme.
One of the most surprising consequences of quantum mechanics is the entanglement of two or more distant particles. Although questions regarding fundamental issues of quantum theory still exist, quantum entanglement has started to play important roles in practical engineering applications. Quantum imaging is one of these exciting areas. Quantum imaging has demonstrated two peculiar features: 1) reproducing ghost images in a nonlocal manner and 2) enhancing the spatial resolution of imaging beyond the diffraction limit. In this paper, we start with the review of classical imaging to establish the basic concepts and formalisms of imaging. We then analyze two-photon imaging with particular emphasis on the physics of spatial resolution enhancement and the ghost imaging phenomenon.
Structured optical fields have led to several ground-breaking techniques in classical imaging and microscopy. At the same time, in the quantum domain, position-momentum entangled photon fields have been shown to have several unique features that can lead to beyond-classical imaging and microscopy capabilities. Therefore, it is natural to expect that position-momentum entangled two-photon fields that are structured can push the boundaries of quantum imaging and microscopy even further beyond. Nonetheless, the existing experimental schemes are able to produce either structured two-photon fields without position-momentum entanglement, or position-momentum entangled two-photon fields without structured correlations. In this article, by manipulating the phase-matching condition of the spontaneous parametric down-conversion process, we report experimental generation of two-photon fields with various structures in their spatial correlations. We experimentally measure the minimum bound on the entanglement of formation and thereby verify the position-momentum entanglement of the structured two-photon field. We expect this work to have important implications for quantum technologies related to imaging and sensing.
One of the most surprising consequences of quantum mechanics is the entanglement of two or more distant particles. Although questions regarding fundamental issues of quantum theory still exist, quantum entanglement has started to play important roles in practical engineering applications. Quantum imaging is one of these exciting areas. Quantum imaging has demonstrated two peculiar features: 1) reproducing "ghost" images in a "nonlocal" manner and 2) enhancing the spatial resolution of imaging beyond the diffraction limit. In this paper, we start with the review of classical imaging to establish the basic concepts and formalisms of imaging. We then analyze two-photon imaging with particular emphasis on the physics of spatial resolution enhancement and the "ghost" imaging phenomenon.
One of the most surprising consequences of quantum mechanics is the entanglement of two or more distant particles. Although questions regarding fundamental issues of quantum theory still exist, quantum entanglement has started to play important roles in practical engineering applications. Quantum imaging is one of these exciting areas. Quantum imaging has demonstrated two peculiar features: (1) reproducing "ghost" images in a "nonlocal" manner, and (2) enhancing the spatial resolution of imaging beyond the diffraction limit. In this article, we start with the review of classical imaging to establish the basic concepts and formalisms of imaging. We then analyze two-photon imaging with particular emphasis on the physics of spatial resolution enhancement and the "ghost" imaging phenomenon.
The use of entangled photons in an imaging system can exhibit effects that cannot be mimicked by any other two-photon source, whatever the strength of the correlations between the two photons. We consider a two-photon imaging system in which one photon is used to probe a remote (transmissive or scattering) object, while the other serves as a reference. We discuss the role of entanglement versus correlation in such a setting, and demonstrate that entanglement is a prerequisite for achieving distributed quantum imaging.