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OSA Light, Energy and the Environment Congress

Ghost Imaging with Atoms and Photons for Remote Sensing

K. G. H. Baldwin, R. I. Khakimov, B. M. Henson, D. K. Shin, Sean S. Hodgman, R. G. Dall, Andrew G. Truscott

Published Jan 1, 2017• 3 citations
Publisher

Abstract

Ghost imaging with correlated photon pairs has been applied to remote sensing without the spatially detected photons interacting with the object: here we demonstrate for the first time ghost imaging using correlated atom pairs.
DOI
10.1364/ee.2017.em4b.1

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Correlated light (either classical or quantum) can be employed in various ways to improve resolution and measurement sensitivity. In an “interaction-free” measurement, a single photon can be used to reveal the presence of an object placed within one arm of an interferometer without being absorbed by it. This method has previously been applied to imaging. With a technique known as “ghost imaging”, entangled photon pairs are used for detecting an opaque object with significantly improved signal-to-noise ratio while preventing over-illumination. Here, we integrate these two methods to obtain a new imaging technique which we term “interaction-free ghost-imaging” that possesses the benefits of both techniques. While improving the image quality of conventional ghost-imaging, this new technique is also sensitive to phase and polarization changes in the photons introduced by a structured object. Furthermore, thanks to the “interaction-free” nature of this new technique, it is possible to reduce the number of photons required to produce a clear image of the object (which could be otherwise damaged by the photons) making this technique superior for probing light-sensitive materials and eventually biological tissues. If time allows, I will discuss some follow-up works involving partial measurements and remote erasure/completion of images. The latter techniques can help to suppress various types of noise during the imaging process.
Here we report on the first realisation of ghost imaging of a macroscopic object using massive particles. The correlated pairs of ultracold metastable helium atoms are originating from two colliding Bose-Einstein condensates (BECs). We use higher-order Kapitza-Dirac scattering to generate the large number of correlated atom pairs required, enabling the creation of a ghost image with good visibility and sub-millimetre resolution. Future extensions could include ghost interference and EPR tests [1].