Abstract
We are going to require a more general description of a quantum state than that given by a state vector. The density matrix provides such a description. Its use is required when we are discussing an ensemble of pure states or when we are describing a subsystem of a larger system.
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A. Peres, Quantum Theory: Concepts and Methods (Kluwer Academic Publishers, Dordrecht, 1995)
M. Nielsen, I. Chuang, Quantum Computation and Quantum Information (Cambridge University Press, Cambridge, 2010)
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© 2013 Springer Science+Business Media New York
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Bergou, J.A., Hillery, M. (2013). The Density Matrix. In: Introduction to the Theory of Quantum Information Processing. Graduate Texts in Physics. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-7092-2_2
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DOI: https://doi.org/10.1007/978-1-4614-7092-2_2
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