Journal
EUROPEAN PHYSICAL JOURNAL D
Volume 22, Issue 3, Pages 513-519Publisher
SPRINGER
DOI: 10.1140/epjd/e2003-00003-3
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We compare two high sensitivity techniques which are used to measure very small displacements of physical objects by optical techniques: the interferometric devices, measuring longitudinal phase shifts, and the devices used to monitor transverse displacement of light beams. We detail the differences and the similarities for the quantum limits on the resolution of both systems. In both cases squeezed light can be used to resolve beyond the standard quantum limit and number correlated states allow us to reach the Heisenberg limit.
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