On pg. 54 of a Quantum Computing textbook (Nielsen and Chuang), it's said that:

it is not surprising that similar techniques can be used to compress the source so that only $H(p, 1 − p)$ qubits are required to store the compressed source, where $H(·)$ is again the Shannon entropy function.

I'm confused with the use of the symbol "·" and I wonder what's the name of it as how it's used.

  • $\begingroup$ It's showing the name of the function $H$. $\endgroup$ Oct 13 at 22:01
  • $\begingroup$ @SeanRoberson Thank you for the reply! Howerver, may I ask what does the name of a function mean? Is it the input, ie, what's in the brackets? $\endgroup$
    – Alexia.
    Oct 13 at 22:23
  • $\begingroup$ It's a placeholder. Nothing too big to worry about. $\endgroup$ Oct 13 at 22:26

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