Taming a macroscopic free mass through continuous quantum measurement
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arXiv: 2611.03159v1 · Summary page
Why cover this story this week?
Keeping track of an almost-free mass
Controlling a mechanical oscillator quantum mechanically is difficult; doing so for an effectively free mass brings the added challenge of unconfined motion. Researchers report a suspended 1-milligram rotor whose environmental isolation allows them to resolve thermal motion associated with a damping rate of only 7 nHz. Continuous quantum measurement then localizes the rotor’s motion, producing conditional states with entropic temperatures as low as 140 nK.
Here, temperature characterizes the conditional state inferred from the measurement record, rather than simply describing a rotor cooled in a refrigerator. That distinction matters, but so does the opening it creates: the apparatus provides new constraints on proposed modifications of quantum mechanics and improved inferred entanglement-to-decoherence rate ratios relevant to gravity experiments. It is a step toward bringing quantum measurement methods to masses and low-frequency motion that are especially interesting for foundational tests.
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