Phys. Rev. A 65, 042313 (2002) [5 pages]Coherent superposition states as quantum rulersReceived 22 September 2001; published 1 April 2002 We explore the sensitivity of an interferometer based on a quantum circuit for coherent states. We show that its sensitivity is at the Heisenberg limit. Moreover, we show that this arrangement can measure very small length intervals. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.65.042313
DOI:
10.1103/PhysRevA.65.042313
PACS:
03.67.-a, 42.50.Dv
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