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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Using quantum correlations and entanglement in continuous laser beams

Hans‐A. Bachor

Published Apr 7, 2006• 0 citations
Publisher

Abstract

Quantum correlations and entanglement are an important addition to the conventional properties of continuous laser beams. They allow us to avoid, at least in principle, the limitations imposed by quantum noise and they open new opportunities for the transfer and processing of quantum information. This manuscript reviews the state of art in the creation, detection of quantum correlations and entanglement, shows the analogy to the techniques based on single photons. It summarizes some of the recent advances in optical sensing and quantum information processing.

DOI
10.1117/12.682631

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Quantum correlations and entanglement are an important addition to the conventional properties of continuous laser beams. They allow us to avoid, at least in principle, the limitations imposed by quantum noise and they open new opportunities for the transfer and processing of quantum information. This manuscript reviews the state of art in the creation, detection of quantum correlations and entanglement, shows the analogy to the techniques based on single photons. It summarizes some of the recent advances in optical sensing and quantum information processing.
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Non-classical correlations in optical beams offer an unprecedented opportunity for surpassing the conventional limits of sensitivity and resolution in optical measurements and imaging, especially, but not only, when low photon flux, down to the single photon, is measured. We review the principles of quantum imaging and sensing techniques that exploit sub-Poissonian photon statistics and non-classical photon number correlation, presenting some state-of-the-art achievements in the field. These quantum photonics protocols have the potential to trigger major steps in many applications, such as microscopy and biophotonics, and represent an important opportunity for a new deal in radiometry and photometry.
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Photonic quantum technologies represent a promising platform for several applications, ranging from long-distance communications to the simulation of complex phenomena. Indeed, the advantages offered by single photons do make them the candidate of choice for carrying quantum information in a broad variety of areas with a versatile approach. Furthermore, recent technological advances are now enabling first concrete applications of photonic quantum information processing. The goal of this manuscript is to provide the reader with a comprehensive review of the state of the art in this active field, with a due balance between theoretical, experimental and technological results. When more convenient, we will present significant achievements in tables or in schematic figures, in order to convey a global perspective of the several horizons that fall under the name of photonic quantum information.