Motion and gravity effects in the precision of quantum clocks

Autor(en)

Joel Lindkvist, Carlos Sabin, Goran Johansson, Ivette Fuentes

Abstrakt

We show that motion and gravity affect the precision of quantum clocks. We consider a localised quantum field as a fundamental model of a quantum clock moving in spacetime and show that its state is modified due to changes in acceleration. By computing the quantum Fisher information we determine how relativistic motion modifies the ultimate bound in the precision of the measurement of time. While in the absence of motion the squeezed vacuum is the ideal state for time estimation, we find that it is highly sensitive to the motion-induced degradation of the quantum Fisher information. We show that coherent states are generally more resilient to this degradation and that in the case of very low initial number of photons, the optimal precision can be even increased by motion. These results can be tested with current technology by using superconducting resonators with tunable boundary conditions.

Organisation(en)

Quantenoptik, Quantennanophysik und Quanteninformation

Externe Organisation(en)

Chalmers University of Technology, University of Nottingham

Journal

Scientific Reports

Band

5

Anzahl der Seiten

9

ISSN

2045-2322

DOI

https://doi.org/10.1038/srep10070

Publikationsdatum

05-2015

Peer-reviewed

Ja

ÖFOS 2012

103025 Quantenmechanik, 103026 Quantenoptik

Schlagwörter

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/2a62e5f0-0fa7-46e9-a06d-28d0682b9011