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michael_nielsen's profile
michael_nielsen
michael_nielsen
michael_nielsen
@michael_nielsen

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michael_nielsen

@michael_nielsen

Searching for the numinous. Co-purveyor of https://quantum.country/ 

San Francisco, CA
michaelnielsen.org
Joined July 2008

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    1. Melanie Mitchell‏ @MelMitchell1 Sep 23
      • Report Tweet

      Melanie Mitchell Retweeted Melanie Mitchell

      @michael_nielsen Thoughts?https://twitter.com/MelMitchell1/status/1176265303887499264 …

      Melanie Mitchell added,

      Melanie Mitchell @MelMitchell1
      Replying to @seanmcarroll @no_scooters
      "Are there are problems that classical computers are better at than QCs?" You say "no" bcs CM is approximation to QM. But I think this requires a narrow definition of "better at". In practice, there may well be problems that classical computers are faster for than QCs.
      1 reply 0 retweets 1 like
    2. michael_nielsen‏ @michael_nielsen Sep 23
      • Report Tweet
      Replying to @MelMitchell1

      In some theoretical sense that's right - it's easy to simulate classical circuits using quantum circuits. In a practical sense, if you want to add two 10,000 digit numbers, it's probably best to use a classical computer: you won't have neatly the overhead involved in QC.

      2 replies 0 retweets 0 likes
    3. Melanie Mitchell‏ @MelMitchell1 Sep 23
      • Report Tweet
      Replying to @michael_nielsen

      Thanks, this is what i thought. It depends whether "better at" is referring to efficiency or universality. That seems to keep getting confused in discussions I see on Twitter. @seanmcarroll @no_scooters

      1 reply 0 retweets 0 likes
    4. michael_nielsen‏ @michael_nielsen Sep 23
      • Report Tweet
      Replying to @MelMitchell1 @seanmcarroll @no_scooters

      It's not really universality, so much as what notion of efficiency you mean. For asymptotic complexity, ignoring polylogarithmic overheads (for error-correction & differences in implementation difficult), QCs will always be at least as efficient, & sometimes far more so.

      3 replies 0 retweets 0 likes
    5. Melanie Mitchell‏ @MelMitchell1 Sep 23
      • Report Tweet
      Replying to @michael_nielsen @seanmcarroll @no_scooters

      "asymptotic complexity" is the spherical cow of computer science 🙂

      1 reply 0 retweets 1 like
    6. michael_nielsen‏ @michael_nielsen Sep 23
      • Report Tweet
      Replying to @MelMitchell1 @seanmcarroll @no_scooters

      Yeah. But often it's what you want. Shor's algorithm (& others) justify a very, very large overhead in the difficulty in implementing a single gate.

      1 reply 0 retweets 1 like
    7. Melanie Mitchell‏ @MelMitchell1 Sep 23
      • Report Tweet
      Replying to @michael_nielsen @seanmcarroll @no_scooters

      Agreed. and spherical cows are responsible for much if not all progress in science!

      1 reply 0 retweets 2 likes
      michael_nielsen‏ @michael_nielsen Sep 23
      • Report Tweet
      Replying to @MelMitchell1 @seanmcarroll @no_scooters

      Well, they're probably not personally responsible! 😀 (Somewhere Paul Krugman has a really nice pair of essays, paeans to the value of simple models, which your tweet has reminded me to reread...)pic.twitter.com/GDqgIfaMp0

      4:08 PM - 23 Sep 2019
      • 1 Like
      • Melanie Mitchell
      0 replies 0 retweets 1 like

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