Helstrom Theorem by No-Signaling Condition
arXiv:quant-ph/0502094 · doi:10.1103/PhysRevA.71.062315
Abstract
We prove a special case of Helstrom theorem by using no-signaling condition in the special theory of relativity that faster-than-light communication is impossible.
Minor corrections (A reference added, discussion part deleted, typos in equations corrected), 2 pages, RevTex