Phys. Rev. A 75, 022326 (2007) [8 pages]Fast rate estimation of a unitary operation in SU(d)Received 13 March 2006; revised 2 October 2006; published 23 February 2007 We give an explicit procedure based on entangled input states for estimating a SU(d) operation U with rate of convergence 1∕N2 when sending N particles through the device. We prove that this rate is optimal. We also evaluate the constant C such that the asymptotic risk is C∕N2. However, other strategies might yield a better constant C. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.75.022326
DOI:
10.1103/PhysRevA.75.022326
PACS:
03.67.-a
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.