Probability distributions consistent with a mixed state

Details Probability distributions consistent with a mixed state Probability distributions consistent with a mixed state

1999-09-06

arxiv.org/abs/quant-ph/9909020v1

Physical Review A 61 (6): Art. No. 064301 (2000)

Physics

Quantum Physics

6 pages, submitted to Physical Review A

Scientific paper

10.1103/PhysRevA.62.052308

A density matrix $\rho$ may be represented in many different ways as a mixture of pure states, $\rho = \sum_i p_i |\psi_i\ra \la \psi_i|$. This paper characterizes the class of probability distributions $(p_i)$ that may appear in such a decomposition, for a fixed density matrix $\rho$. Several illustrative applications of this result to quantum mechanics and quantum information theory are given.

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