Quantum metrology: dynamics versus entanglement.
نویسندگان
چکیده
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/n3/2, even when the constituents are initially unentangled. We devise a protocol that achieves the 1/n3/2 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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عنوان ژورنال:
- Physical review letters
دوره 101 4 شماره
صفحات -
تاریخ انتشار 2008