Beating the Standard Quantum Limit with Four Entangled Photons

Details Beating the Standard Quantum Limit with Four Entangled Photons Beating the Standard Quantum Limit with Four Entangled Photons

2007-08-10

arxiv.org/abs/0708.1385v2

Science 316, 726-729 (2007)

Physics

Quantum Physics

5 pages, 4 figures Author name was slightly modified

Scientific paper

10.1126/science.1138007

Precision measurements are important across all fields of science. In particular, optical phase measurements can be used to measure distance, position, displacement, acceleration and optical path length. Quantum entanglement enables higher precision than would otherwise be possible. We demonstrate an optical phase measurement with an entangled four photon interference visibility greater than the threshold to beat the standard quantum limit--the limit attainable without entanglement. These results open the way for new high-precision measurement applications.

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