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Japanese Journal of Applied Physics

Imaging, Sensing, and Optical Memory

Published Aug 3, 2018• 0 citations
Publisher
DOI
10.7567/jjap.57.09s001

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The strong demand for quantum memory, a key building block of quantum network, has inspired new methodologies and led to experimental progress for quantum storage. The use of quantum memory for spatial multimode or image storage could dramatically increase the channel bit rate. Furthermore, quantum memory that can store multiple optical modes would lead to higher efficiencies in quantum communication and computation. Here, by using resonant tripod electromagnetically induced transparency in a cold atomic ensemble, we experimentally demonstrate the storage of two probes with different frequencies and images in the frequency domain. In addition, by using different read light, we realize the frequency conversion of retrieved images with high efficiency. Besides, our method may be used to create a superposition of the images by realizing the function of a beam splitter. All advantages make our method useful in many fields, including quantum information, detection, imaging, sensing, and so on.
Optical tomography can reveal the intrinsic structure of complex objects with high accuracy. Cold atoms are an excellent model physical system for designing new protocols. By combining the gradient echo memory protocol with spatial homodyne detection, our experiment achieved micron-level resolution and excellent shot-noise limited sensitivity for interrogating atomic coherence. We also demonstrated three-dimensional imaging of an external magnetic field, and plan to extend the scheme to ultra-sensitive three-dimensional imaging of microwave fields using Rydberg atoms. Our work pushes the boundaries of quantum sensing for weak fields and unexplored three-dimensional tomographic imaging. The method may also be applied to hot atoms or solid-state probes, such as color centers, or ions, embedded in an interrogated medium.