@article{9092226cece740b88c0ed079aee5510d,
title = "Meaning of the density matrix",
abstract = "Protective measurement, which was proposed as a method of observing the wavefunction of a single system, is extended to the observation of the density matrix of a single system. This provides a new meaning to the density matrix as having the same ontological status as the wave-function describing a pure state. This also enables quantum entropy to be associated with a single system.",
keywords = "Density matrix, Entropy, Quantum measurement",
author = "J. Anandan and Y. Aharonov",
note = "Funding Information: Acknowledgements. We thank Katherine Brading for stimulating discussions. This work was supported by NSF grant PHY-9601280 and the work of Y.A. by the Israel National Academy of Sciences under grant no. 61495.",
year = "1999",
month = dec,
doi = "10.1023/A:1021699226154",
language = "אנגלית",
volume = "12",
pages = "571--578",
journal = "Foundations of Physics Letters",
issn = "0894-9875",
publisher = "Plenum Press",
number = "6",
}