Media type: E-Article Title: Quantum Enhanced Estimation of a Multidimensional Field Contributor: Baumgratz, Tillmann; Datta, Animesh Published: American Physical Society (APS), 2016 Published in: Physical Review Letters, 116 (2016) 3 Language: English DOI: 10.1103/physrevlett.116.030801 ISSN: 1079-7114; 0031-9007 Origination: Footnote: