Whistling a superfluid quantum melody

摘要

For physicists probing the curious quantum behavior of superfluids, "Whistle While You Work" is a highly appropriate theme song. By detecting a high-pitched whistle, researchers have obtained the first clear indication that helium-3 atoms can shuttle back and forth between two containers separated by a thin membrane perforated with tiny holes. Instead of flowing from one container to the other in response to a slight difference in pressure, the helium-3 superfluid oscillates at a characteristic frequency.