Quantum Information and Entropy
<|reference_start|>Quantum Information and Entropy: Thermodynamic entropy is not an entirely satisfactory measure of information of a quantum state. This entropy for an unknown pure state is zero, although repeated measurements on copies of such a pure state do communicate information. In view of this, we propose a new measure for the informational entropy of a quantum state that includes information in the pure states and the thermodynamic entropy. The origin of information is explained in terms of an interplay between unitary and non-unitary evolution. Such complementarity is also at the basis of the so-called interaction-free measurement.<|reference_end|>
@article{kak2006quantum,
    title={Quantum Information and Entropy},
    author={Subhash Kak},
    journal={International Journal of Theoretical Physics, vol. 46, pp.
  860-876, 2007.},
    year={2006},
    doi={10.1007/s10773-006-9245-6},
    archivePrefix={arXiv},
    eprint={quant-ph/0605096},
    primaryClass={quant-ph cs.IT math.IT}
}