Media type: E-Article Title: Coherent superposition states as quantum rulers Contributor: Ralph, T. C. Published: American Physical Society (APS), 2002 Published in: Physical Review A, 65 (2002) 4 Language: English DOI: 10.1103/physreva.65.042313 ISSN: 1050-2947; 1094-1622 Origination: Footnote: