Purifications Without Entanglement, State Reconstructions and Entropy

Details Purifications Without Entanglement, State Reconstructions and Entropy Purifications Without Entanglement, State Reconstructions and Entropy

2004-07-20

arxiv.org/abs/quant-ph/0407156v2

Physics

Quantum Physics

6 pages in REVTEX4. This is a considerably extended and revised version of the earlier quant-ph/0407156. The analysis of maxim

Scientific paper

In this paper we have analysed in detail two different purification protocols. The first one, proposed by Sudarshan, is based on the preservation of probabilities.We have constructed a second protocol here based on optimisation of fidelities. We have considered both complete and partial measurements and have established bounds and inequalities for various fidelities. For every type of measurement, we have analysed post-measurement states based on the Maximum entropy principle as well as what we have proposed as unbiased states. We show that our purification protocol always leads to better state reconstruction. These schemes can be thought of as operations in the sense of Kraus and we have explicitly constructed the Kraus operators for these. We have also shown that the entropy either increases or remains the same depending on the choice of the purification basis.

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