Baumgratz, Tillmann and Datta, Animesh (2016) Quantum enhanced estimation of a multidimensional field. Physical Review Letters, 116 (3). 030801 . doi:10.1103/PhysRevLett.116.030801

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Abstract

We present a framework for the quantum enhanced estimation of multiple parameters corresponding to noncommuting unitary generators. Our formalism provides a recipe for the simultaneous estimation of all three components of a magnetic field. We propose a probe state that surpasses the precision of estimating the three components individually, and we discuss measurements that come close to attaining the quantum limit. Our study also reveals that too much quantum entanglement may be detrimental to attaining the Heisenberg scaling in the estimation of unitarily generated parameters.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH):	Magnetic fields
Journal or Publication Title:	Physical Review Letters
Publisher:	American Physical Society
ISSN:	0031-9007
Official Date:	21 January 2016
Dates:	Date Event 21 January 2016 Published 22 July 2015 Submitted 21 January 2015 Accepted
Volume:	116
Number:	3
Article Number:	030801
DOI:	10.1103/PhysRevLett.116.030801
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access

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