Speaker: Eugene Polzik, Niels Bohr Institute, Copenhagen University
A fascinating question of the limits of measurement precision in quantum mechanics has been recently revisited. It has been shown that a measurement of motion is not limited by the uncertainty principle, if a suitable reference frame for such a measurement in chosen [1]. The development of this field dubbed “measurements in the negative mass reference frame” or “quantum mechanics free subspaces” has led to a number of potential applications. In the talk I will introduce the concept of a reference frame with an effective negative mass which forms the basis for such measurements. Experiments where a macroscopic object and a reference frame are driven deep into entangled quantum regime will be reviewed, including observation of a trajectory of motion in a quantum reference frame with, in principle, unlimited accuracy [2] and an application of those ideas to gravitational wave detection [3].
1. Nature, 547, 191 (2017).
2. Nature Physics (2020) 10.1038/s41567-020-1031-5.
3. Phys. Rev. Lett. 121, 031101 (2018); Physical Review X Quantum (2022) 3 (2), 020362; Nature Comm., (2022) 13, 4815.