Sasaki, Masahide and Barnett, Stephen M. and Jozsa, Richard and Osaki, Masao and Hirota, Osamu (1999) Accessible information and optimal strategies for real symmetrical quantum sources. Physical Review A, 59 (5). pp. 33253335. ISSN 10502947

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Abstract
We study the problem of optimizing the Shannon mutual information for sources of real quantum states, i.e., sources for which there is a basis in which all of the states have only real components. We consider in detail the sources EM of M equiprobable quantum bit (qubit) states lying symmetrically around the great circle of real states on the Bloch sphere and give a variety of explicit optimal strategies. We also consider general real groupcovariant sources for which the group acts irreducibly on the subset of all real states and prove the existence of a real groupcovariant optimal strategy, extending a theorem of Davies [E. B. Davies, IEEE. Inf. Theory IT24, 596 (1978)]. Finally, we propose an optical scheme to implement our optimal strategies, simple enough to be realized with present technology.
Item type:  Article 

ID code:  5860 
Keywords:  quantum states, qubit, optimal strategies, optics, optical physics, Optics. Light, Atomic and Molecular Physics, and Optics 
Subjects:  Science > Physics > Optics. Light 
Department:  Faculty of Science > Physics 
Depositing user:  Miss Darcy Spiller 
Date Deposited:  30 Apr 2008 
Last modified:  12 Dec 2015 10:22 
Related URLs:  
URI:  http://strathprints.strath.ac.uk/id/eprint/5860 
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