Discrimination between pure states and mixed states
- Publication Type:
- Journal Article
- Physical Review A - Atomic, Molecular, and Optical Physics, 2007, 75 (6)
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In this paper, we discuss the problem of determining whether a quantum system is in a pure state, or in a mixed state. We apply two strategies to settle this problem: the unambiguous discrimination and the maximum confidence discrimination. We prove that the optimal versions of both strategies are equivalent. Furthermore, the scheme also provides a method to estimate the purity of quantum states, and the Schmidt number of composed systems. © 2007 The American Physical Society.
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