User talk:Doroncohen

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Hello, Doroncohen, and welcome to Wikipedia! Thank you for your contributions. I hope you like the place and decide to stay. Here are some pages that you might find helpful: I hope you enjoy editing here and being a Wikipedian! Please sign your messages on discussion pages using four tildes ( ~ ); this will automatically insert your username and the date. If you need help, check out Questions, ask me on my talk page, or ask your question on this page and then place  before the question. Again, welcome! Aboutmovies (talk) 07:17, 3 June 2010 (UTC)
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The what now?
What is an "SP formula"? Selling price? Standard package? State phase? Maury Markowitz (talk) 14:44, 25 January 2014 (UTC)

Answer1: I have been notified by email with regard to this question. Not clear to me whether it is a spam, and how should it be answered. As explained in http://en.wikipedia.org/wiki/Dephasing_rate_SP_formula the SP formula is used to calculate dephasing rate of a system the has power spectrum $P$, and is driven by noise that has power spectrum $S$. — Preceding unsigned comment added by 79.182.102.171 (talk) 15:52, 25 January 2014 (UTC)


 * I read the article, but I'm still not sure if this term is actually used elsewhere. I'm also wondering why this isn't part of the dephasing article? Maury Markowitz (talk) 20:19, 25 January 2014 (UTC)
 * Yeah, applying some google-fu it appears the term "SP formula" appears nowhere else but this article. Is this a term widely found in articles on the topic? If it's not, perhaps there is a better title, or it should simply be at the end of the general formula? Maury Markowitz (talk) 20:28, 25 January 2014 (UTC)

Answer2: In fact there is a place to consider unification of the "dephasing" page with http://en.wikipedia.org/wiki/Quantum_decoherence Note that some people make distinctions, and do not agree on terminology. As for the "SP formula" it is a very limited item that can be either separated (as it is) in order not to bother the general reader, or else it can be combined as a sub-section. In a slightly different context the latter approach has been criticized (i.e. an editor/writer had the opinion that a limited issue should be separated from the article that describes the "big" picture.)

Answer3: Regarding the term "SP formula". The integral expression is in essence the most widely used way of calculating dephasing rate. But if you go to the literature you see that: (1) It is not a named formula; (2) The integrand is not identified as the product of "S" and "P". In most publications "the formula" appears as the outcome of some system-specific formulations without paying attention to its *universality*. So you can call it if you wish "Dephasing_rate_formula", but then it is ambiguous. Also terms like "Fermi_golden-rule_based_formula_for_dephasing_rate_calculation" or "First_order_perturbation_theory_formula_for_dephasing_rate_calculation" sound not economical, and lack the precise "SP" connotation. BTW: the letters "S" and "P" are the conventional notations for power spectra.