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Volumn 100, Issue 5, 2008, Pages

Quantum discord and the power of one qubit

Author keywords

[No Author keywords available]

Indexed keywords

COMPUTATION THEORY; MATHEMATICAL MODELS; PURIFICATION; SEMICONDUCTOR QUANTUM DOTS;

EID: 38949118027     PISSN: 00319007     EISSN: 10797114     Source Type: Journal    
DOI: 10.1103/PhysRevLett.100.050502     Document Type: Article
Times cited : (1274)

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    • The eigendecomposition ρSM= apΠa yields apapj|aρS|a,j, where ρS|a,j=TrM(ΠjΠa)/pj|a is a pure state of S. It follows from the pure-state decomposition ρS|j= apa|jρS|a,j that H(A|j) S(ρS|j). Thus H(S,M)=H(A) H(A|J)= jpjH(A|j) H {Πj}(S|M) H (S|M), from which the upper bound on discord follows.
    • The eigendecomposition ρSM= apΠa yields apapj|aρS|a,j, where ρS|a,j=TrM(ΠjΠa)/pj|a is a pure state of S. It follows from the pure-state decomposition ρS|j= apa|jρS|a,j that H(A|j) S(ρS|j). Thus H(S,M)=H(A) H(A|J)= jpjH(A|j) H {Πj}(S|M) H (S|M), from which the upper bound on discord follows.
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.