Discrimination between pure states and mixed states
arXiv:quant-ph/0611122 · doi:10.1103/PhysRevA.75.062306
Abstract
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 also proved that the optimal versions of both strategies are equivalent. The efficiency of the discrimination is also analyzed. This scheme also provides a method to estimate purity of quantum states, and Schmidt numbers of composed systems.
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Cited by in corpus (5)
- Optimum Unambiguous Discrimination of Linearly Independent Pure States
- Detecting mixedness of qutrit systems using the uncertainty relation
- Exact dynamics of entanglement and entropy in structured environments
- Certifying the purity of quantum states with temporal correlations
- Quantum state discrimination