Lecturer: Eugene S. Polzik, Niels Bohr Institute, University of Copenhagen

Zoom Link: https://huji.zoom.us/j/82361664742?pwd=ZU84SWQyKzlRaDloWUUrVVV2SGJEZz09
(Meeting ID: 823 6166 4742 Passcode: 165995)

 

Abstract: According to textbook quantum mechanics, a measurement of the position of an object imposes a random quantum back action kick to its momentum. This randomness translates with time into position uncertainty, thus leading to the well known uncertainty on the measurement of motion. As a consequence, and in accordance with the Heisenberg uncertainty principle, this leads to the so-called standard quantum limit on the precision of sensing of position, force and fields. In this talk I will present the ideas and experimental results for measurement of motion of a mechanical oscillator with, in principle, unlimited precision. This is achieved by measuring the motion in a special reference frame with an effective negative mass. Applications to force sensing, and gravitational wave detection will be discussed.

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Phys. Rev. Lett. 121, 031101 (2018).
Nature, 547, 191 (2017).