Related Experiment Video
Updated: Jan 23, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
Published on: November 11, 2013
Quantum communications and quantum metrology in the spacetime of a rotating planet
Jan Kohlrus1, David Edward Bruschi2,3, Jorma Louko1
11School of Mathematical Sciences, University of Nottingham, University Park, Nottingham, NG7 2RD UK.
Abstract:
We study how quantum systems that propagate in the spacetime of a rotating planet are affected by the curved background. Spacetime curvature affects wavepackets of photons propagating from Earth to a satellite, and the changes in the wavepacket encode the parameters of the spacetime. This allows us to evaluate quantitatively how quantum communications are affected by the curved spacetime background of the Earth and to achieve precise measurements of Earth's Schwarzschild radius and equatorial angular velocity. We then provide a comparison with the state of the art in parameter estimation obtained through classical means. Satellite to satellite communications and future directions are also discussed.
Related Concept Videos
Quantum Numbers
The Quantum-Mechanical Model of an Atom
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)
Communication
Communication
Acceleration due to Gravity on Other Planets
Astronomical observations are thus used to measure the acceleration due to gravity on other planets. This can be determined by observing the effect of a planet's gravity on objects close to it. The crucial factor that helps in this...

