Physics – Quantum Physics
Scientific paper
2005-06-06
Commun. Theor. Phys. (Beijing, China) 44 (2005) pp. 622-624
Physics
Quantum Physics
4 pages and 3 figures
Scientific paper
It has been claimed in the literature that impossibility of faster-than-light quantum communication has an origin of indistinguishability of ensembles with the same density matrix. We show that the two concepts are not related. We argue that: 1) even with an ideal single-atom-precision measurement, it is generally impossible to produce two ensembles with exactly the same density matrix; or 2) to produce ensembles with the same density matrix, classical communication is necessary. Hence the impossibility of faster-than-light communication does not imply the indistinguishability of ensembles with the same density matrix.
Long Gui Lu
Sun Yang
Wang Chuan
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