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Optical and Quantum Sensing and Precision Metrology II

Tailoring spatial quantum correlations for quantum information

Alberto M. Marino

Published Mar 13, 2024• 0 citations
Publisher

Abstract

The spatial degree of freedom of entangled beams of light offers unique opportunities for quantum information due to its large dimensionality. Here, we show that it is possible to tailor the distribution of the spatial quantum correlations in entangled twin beams by taking advantage of the phase matching properties of four-wave mixing. This control can enable high-capacity quantum channels and quantum-enhanced spatially resolved sensing and imaging.

DOI
10.1117/12.3011717

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The spatial degree of freedom of entangled beams of light offers unique opportunities for quantum information due to its large dimensionality. Here, we show that it is possible to tailor the distribution of the spatial quantum correlations in entangled twin beams by taking advantage of the phase matching properties of four-wave mixing. This control can enable high-capacity quantum channels and quantum-enhanced spatially resolved sensing and imaging.
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The spatial degree of freedom of quantum states of light can offer new possibilities for imaging and sensing applications, such as enhanced optical resolution, noiseless image amplification, and enhanced beam positioning. In order to take full advantage of the spatial degree of freedom for practical applications, it is necessary to control the quantum correlations between the spatial modes that make up a quantum state of light. In this talk, I will present our study of the spatial quantum correlations in bright entangled twin beams and show that it is possible to obtain full control over their distribution.
Two beams of light can be quantum mechanically entangled through correlations of their phase and intensity fluctuations. For a pair of spatially extended image-carrying light fields, the concept of entanglement can be applied not only to the entire images but also to their smaller details. We used a spatially multimode amplifier based on four-wave mixing in a hot vapor to produce twin images that exhibit localized entanglement. The images can be bright fields that display position-dependent quantum noise reduction in their intensity difference or vacuum twin beams that are strongly entangled when projected onto a large range of different spatial modes. The high degree of spatial entanglement demonstrates that the system is an ideal source for parallel continuous-variable quantum information protocols.