Quantum limits to the measurement of spacetime geometry

Details Quantum limits to the measurement of spacetime geometry Quantum limits to the measurement of spacetime geometry

2005-05-10

arxiv.org/abs/quant-ph/0505064v1

Physics

Quantum Physics

11 pages, plain TeX

Scientific paper

This letter analyzes the limits that quantum mechanics imposes on the accuracy to which spacetime geometry can be measured. By applying the physics of computation to ensembles of clocks, as in GPS, we present a covariant version of the quantum geometric limit, which states that the total number of ticks of clocks and clicks of detectors that can be contained in a four volume of spacetime of radius r and temporal extent t is less than or equal to rt/pi x_P t_P, where x_P, t_P are the Planck length and time. The quantum geometric bound limits the number of events or `ops' that can take place in a four-volume of spacetime and is consistent with and complementary to the holographic bound which limits the number of bits that can exist within a three-volume of spacetime.

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