What is it about?

The efficiency with which light gets into or out of optical devices is a key determinate of their performance. This problem, known as optical packaging, is especially challenging in extreme environments - including at ultra low temperatures used in quantum experiments. In this paper we demonstrate a new technology for extracting light from devices with extremely low loss at temperatures a within a tenth of a degree of absolute 0.

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Why is it important?

Optical devices used for quantum communication and computation are currently limited in large part by how efficiently light can be collected from them. By using the technique demonstrated here this key limitation can be overcome, bringing a variety of quantum optical devices from hypothetical to potential real world applications. It's especially useful in the context of a "quantum internet" which uses light to communicate quantum bits between parties. This could be a key tool for an ultra secure communication network in the near future.

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This page is a summary of: Cryogenic packaging of nanophotonic devices with a low coupling loss <1 dB, Applied Physics Letters, October 2023, American Institute of Physics,
DOI: 10.1063/5.0170324.
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