For the first time, physicists have figured out how to communicate with an artificial atom using sound instead of light. The photons belong to the wacky world of quantum mechanics where they behave as both particles and waves, and scientists have been studying their bizarre behavior for decades. To create the stream of sound particles, the researchers used a superconducting circuit, which represented an "artificial atom." Artificial atoms can be charged up across multiple energy levels just like a real atom, and scientists can study the quantum behavior of the particles they emit. For the experiment, the researchers cooled the artificial atom to near absolute zero so that heat would not disturb the delicate quantum system.
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