Comparison of two unknown pure quantum states

Barnett, Stephen M. and Chefles, Anthony and Jex, Igor (2003) Comparison of two unknown pure quantum states. Physics Letters A, 307 (4). pp. 189-195. ISSN 0375-9601 (https://doi.org/10.1016/S0375-9601(02)01602-X)

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Abstract

Can we establish whether or not two quantum systems have been prepared in the same state? We investigate the possibility of universal unambiguous state comparison. We show that it is impossible to conclusively identify two pure unknown states as being identical, and construct the optimal measurement for conclusively identifying them as being different. We then derive optimal strategies for state comparison when the state of each system is one of two known states.

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• Item metadata

  Item type:	Article
  ID code:	5857
  Dates:	Date Event 3 February 2003 Published
  Subjects:	Science > Physics > Optics. Light
  Department:	Faculty of Science > Physics Unknown Department
  Depositing user:	Miss Darcy Spiller
  Date deposited:	24 Apr 2008
  Last modified:	11 Nov 2024 08:40
  Related URLs:	Related item
  URI:	https://strathprints.strath.ac.uk/id/eprint/5857