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Volumn 92, Issue 13, 2004, Pages

Maximally entangled mixed states: Creation and concentration

Author keywords

[No Author keywords available]

Indexed keywords

BIREFRINGENCE; COHERENT LIGHT; ELECTRON ENERGY LEVELS; ENTROPY; MATRIX ALGEBRA; OPTICAL PROPERTIES; PARAMETER ESTIMATION; PHOTONS; POLARIZATION;

EID: 2342571478     PISSN: 00319007     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevLett.92.133601     Document Type: Article
Times cited : (145)

References (39)
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    • note
    • After [7], we use "concentration" to indicate an increase of both purity and entanglement.
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    • note
    • Note that for certain entanglement and mixedness parametrizations, the Werner states are the MEMS [21].
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    • J. W. Pan, C. Simon, Č. Brukner, and A. Zeilinger, Nature (London) 410, 1067 (2001); J. W. Pan et al., Nature (London) 423, 417 (2003); Z. Zhao et al., Phys. Rev. Lett. 90, 207901 (2003).
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    • note
    • The optical path length difference of the decoherers is not generally exactly 140λ, causing an extra phase on the off-diagonal elements. The phase is set to zero by slightly tipping one of the decoherers about its vertical axis.
  • 33
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    • B.A. thesis, Dartmouth College, also quant-ph/0010001;
    • A. J. Berglund, B.A. thesis, Dartmouth College, 2000; also quant-ph/0010001; N. Peters et al., J. Quant. Inf. Comp. 3, 503 (2003).
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    • As recently demonstrated [M. Barbieri, F. De Martini, G. Di Nepi, and P. Mataloni, quant-ph/0303018; G. Di Nepi, F. De Martini, M. Barbieri, and P. Mataloni, quant-ph/0307204], one could instead use the spatial degree of freedom to induce decoherence; however, the states are then not suitable, e.g., for use in fiber optic systems, or where interference methods are needed.
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    • 2-4).
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    • note
    • In "twirling," a random SU(2) rotation is independently performed on each photon pair.
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    • note
    • Because it is presently very difficult to produce simultaneous indistinguishable pairs of photons, the filtration technique is much more efficient, e.g., where typically 20% of our incident ensemble of pairs survived, less than 0.005% would survive (estimated from the twofold and fourfold coincidence data reported in [24]) in the interference schemes, which require four photons.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.