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Volumn 70, Issue 5 A, 2004, Pages

Mixed-state sensitivity of several quantum-information benchmarks

Author keywords

[No Author keywords available]

Indexed keywords

BENCHMARKING; EIGENVALUES AND EIGENFUNCTIONS; ENTROPY; MATHEMATICAL MODELS; MATHEMATICAL OPERATORS; MICROELECTROMECHANICAL DEVICES; PERTURBATION TECHNIQUES; PHOTONS; POLARIZATION;

EID: 37649030607     PISSN: 10502947     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevA.70.052309     Document Type: Article
Times cited : (117)

References (23)
  • 14
    • 0038303067 scopus 로고    scopus 로고
    • Note that for certain entanglement and mixedness parameter-izations, the Werner states are the MEMS [T. C. Wei et al., Phys. Rev. A 67, 022110 (2003)].
    • (2003) Phys. Rev. A , vol.67 , pp. 022110
    • Wei, T.C.1
  • 21
    • 0038412862 scopus 로고    scopus 로고
    • note
    • In more detail, we project the ideal target state into 16 basis vectors, such as 〈00|, |〈11|, 〈(0+i1)0|, etc., to obtain a list of probabilities of given "measurement" outcomes. These probabilities are then multiplied by a constant number simulating an expected average number of counts in a total basis measure ment, e.g., what one would expect to observe when projecting into 〈00|, 〈|01|, 〈10|, and 〈11|. Next, each of these ideal counts (plus 1 to avoid zero distributions) is used as the mean of a Poisson distribution, from which a random number is generated. These "measurement" values are then processed using a maximum likelihood technique to give a physically valid perturbed density matrix [D. F. V. James, P. G. Kwiat, W. J. Munro, and A. G. White, Phys. Rev. A 64, 052312 (2001); J. B. Altepeter, D. F. V. James, and P. G. Kwiat, Quantum State Estimation, edited by M. Paris and J. Rehacek (Springer, Berlin, 2004), Chap. 3]. If the fidelity between the perturbed density matrix and the target state is greater than 0.9900, the tangle and linear entropy are calculated and plotted in Fig. 2.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.