Physics – Quantum Physics
Scientific paper
1995-06-07
Quantum Semiclass. Opt. 7 (1995) 639
Physics
Quantum Physics
11 pages, to appear in Quantum and Semiclassical Optics
Scientific paper
10.1088/1355-5111/7/4/018
Quantum fluctuations impose fundamental limits on measurement and space-time probing. Although using optimised probe fields can allow to push sensitivity in a position measurement beyond the "standard quantum limit", quantum fluctuations of the probe field still result in limitations which are determined by irreducible dissipation mechanisms. Fluctuation-dissipation relations in vacuum characterise the mechanical effects of radiation pressure vacuum fluctuations, which lead to an ultimate quantum noise for positions. For macroscopic reflectors, the quantum noise on positions is dominated by gravitational vacuum fluctuations, and takes a universal form deduced from quantum fluctuations of space-time curvatures in vacuum. These can be considered as ultimate space-time fluctuations, fixing ultimate quantum limits in space-time measurements.
Jaekel Marc-Thierry
Reynaud Serge
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