Quantum metrology. Optically measuring force near the standard quantum limit.

Abstract

The Heisenberg uncertainty principle sets a lower bound on the noise in a force measurement based on continuously detecting a mechanical oscillator's position. This bound, the standard quantum limit, can be reached when the oscillator subjected to the force is unperturbed by its environment and when measurement imprecision from photon shot noise is balanced… (More)
DOI: 10.1126/science.1249850

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