2003
Correlation-assisted quantum communication
ZIMAN, Mario a Vladimír BUZEKZákladní údaje
Originální název
Correlation-assisted quantum communication
Autoři
ZIMAN, Mario (703 Slovensko) a Vladimír BUZEK (703 Slovensko, garant)
Vydání
Physical Review A, USA, American Physical Society, 2003, 1050-2947
Další údaje
Jazyk
angličtina
Typ výsledku
Článek v odborném periodiku
Obor
10201 Computer sciences, information science, bioinformatics
Stát vydavatele
Spojené státy
Utajení
není předmětem státního či obchodního tajemství
Impakt faktor
Impact factor: 2.589
Kód RIV
RIV/00216224:14330/03:00008721
Organizační jednotka
Fakulta informatiky
Klíčová slova anglicky
correlation; quantum communication
Štítky
Změněno: 28. 5. 2004 23:41, doc. RNDr. Jan Bouda, Ph.D.
Anotace
V originále
Quantum dense coding is considered to be one of the most remarkable demonstrations of the existence of quantum entanglement. In this paper, we analyze the role of correlations (both classical and quantum) in quantum communication protocols. We study how the capacity of a single-qubit quantum channel depends on correlations between Alice and Bob. In particular, we consider a scenario when Alice and Bob share a pair of qubits in a state such that Alice's qubit is in the state described by the density operator r=1/2I+n x s. We evaluate a capacity of the noiseless channel for two cases: (1) when Bob performs measurement just on the particle received from Alice, and (2) in the case when he utilizes correlations that have been established prior to the communication. We present a simple classical scenario which might serve as a prototype of quantum dense coding. We generalize our results also for qudits. In addition, we address some aspects of the issue of security in correlation-assisted communication protocols.
Návaznosti
| GA201/01/0413, projekt VaV |
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| MSM 143300001, záměr |
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