Volume 86, Number 5, June 2009
|Number of page(s)||5|
|Published online||24 June 2009|
Quantum amplitude amplification by phase noise
Institute of Laser Science, The University of Electro-Communication 1-5-1 Chofugaoka, Chofu, 182-8585, Japan
Corresponding author: firstname.lastname@example.org
Accepted: 15 May 2009
I consider a system in which an atom in a superposition of momentum eigenstates of a periodic potential is subject to periodic random phase jumps in that potential. If the j-th state in superposition is “marked" by giving the -th state a phase flip, I show that for the correct amount of noise, a ~ 6 dB amplification of the marked state probability amplitude occurs, with no significant amplification in other states.
PACS: 03.67.Ac – Quantum algorithms, protocols, and simulations / 03.75.-b – Matter waves / 05.40.Ca – Noise
© EPLA, 2009
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