Phys. Rev. Lett. 89, 207901 (2002) [4 pages]Almost Every Pure State of Three Qubits Is Completely Determined by Its Two-Particle Reduced Density MatricesReceived 18 July 2002; published 24 October 2002 In a system of n quantum particles, we define a measure of the degree of irreducible n-way correlation, by which we mean the correlation that cannot be accounted for by looking at the states of n-1 particles. In the case of almost all pure states of three qubits, we show that there is no such correlation: almost every pure state of three qubits is completely determined by its two-particle reduced density matrices. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.207901
DOI:
10.1103/PhysRevLett.89.207901
PACS:
03.67.-a, 03.65.Ta, 03.65.Ud
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