Quantum Metrology: Dynamics vs. Entanglement

Details Quantum Metrology: Dynamics vs. Entanglement Quantum Metrology: Dynamics vs. Entanglement

2008-05-14

arxiv.org/abs/0805.2180v1

Phys. Rev. Lett. 101, 040403 (2008).

Physics

Quantum Physics

4 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.101.040403

A parameter whose coupling to a quantum probe of $n$ constituents includes all two-body interactions between the constituents can be measured with an uncertainty that scales as $1/n^{3/2}$, even when the constituents are initially unentangled. We devise a protocol that achieves the $1/n^{3/2}$ scaling without generating any entanglement among the constituents, and we suggest that the protocol might be implemented in a two-component Bose-Einstein condensate.

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