Journal
COMMUNICATIONS IN THEORETICAL PHYSICS
Volume 54, Issue 4, Pages 661-662Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0253-6102/54/4/15
Keywords
quantum dynamics; evolution speed; time-energy uncertainty relations; moments
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Funding
- National Natural Science Foundation of China [10771208]
- Science Fund for Creative Research Groups [10721101]
- Key Lab of Random Complex Structures and Data Science, CAS [2008DP173182]
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The unified bound on the fundamental limit of quantum dynamics rate, as quietly recently obtained by Levitin and Toffoli [Phys. Rev. Lett. 103 (2009) 160502], is improved and refined. The improvement may be arbitrarily large in certain cases. In particular, this puts a limit on the operation rate of quantum gates allowed by quantum mechanics.
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