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Motion and gravity effects in the precision of quantum clocks

Joel Lindkvist (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik) ; C. Sabn ; Göran Johansson (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik) ; I. Fuentes
Scientific Reports (2045-2322). Vol. 5 (2015),
[Artikel, refereegranskad vetenskaplig]

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.



Denna post skapades 2015-06-29. Senast ändrad 2015-06-29.
CPL Pubid: 219049

 

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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik

Ämnesområden

Fysik

Chalmers infrastruktur