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Phys. Rev. A 62, 052301 (2000) [7 pages]

Equally distant, partially entangled alphabet states for quantum channels

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Mário Ziman1 and Vladimír Bužek2,*
1Faculty of Mathematics and Physics, Comenius University, Mlynská dolina F2, Bratislava 842 15, Slovakia
2SOKEN-DAI, The Graduate University for Advanced Studies, Shonan Village, Hayama, Kanagawa 240-0193, Japan

Received 15 March 2000; published 9 October 2000

Each Bell state has the property that by performing just local operations on one qubit, the complete Bell basis can be generated. That is, states generated by local operations are totally distinguishable. This remarkable property is due to maximal quantum entanglement between the two particles. We present a set of local unitary transformations that generate out of partially entangled two-qubit state a set of four maximally distinguishable states that are mutually equally distant. We discuss quantum dense coding based on these alphabet states.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.62.052301
DOI:
10.1103/PhysRevA.62.052301
PACS:
03.67.-a, 89.70.+c

*On leave from the Institute of Physics, Slovak Academy of Sciences, Dúbravská cesta 9, 842 28 Bratislava, Slovakia and Faculty of Informatics, Masaryk University, Botanická 68a, 602 00 Brno, Czech Republic.

 
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