https://doi.org/10.1140/epjc/s10052-020-08530-6
Regular Article - Theoretical Physics
Fisher information and the weak equivalence principle of a quantum particle in a gravitational wave
Institute for Photonics and Advanced Sensing and School of Chemistry and Physics, The University of Adelaide, 5005, Adelaide, SA, Australia
Received:
31
July
2020
Accepted:
6
October
2020
Published online:
26
October
2020
We show that the weak equivalence principle (WEP) is violated for a quantum particle in a gravitational wave (GW) background, in the sense that extra mass information can be extracted in the presence of the GW. We quantify the degree of violation with the Fisher information of mass. This provides a precise characterisation of WEP violation by quantum systems in a GW, that should be useful in formalising other works that have argued for such violations heuristically.
© The Author(s) 2020
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