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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. dabacon‏ @dabacon Sep 16
      • Report Tweet

      dabacon Retweeted Josh Combes

      Ha, totally 🤦. Question: what was the first physical system (scalable or no) mentioned as a substrate for quantum computing?https://twitter.com/JoshKoomz/status/1173711804955889664 …

      dabacon added,

      Josh Combes @JoshKoomz
      I woke up this morning in a universe where Ions are a NEW quantum computing technology. 🤦‍♂️ "Quantum Computer Battle Royale: Upstart Ions Versus Old Guard Superconductors" "However, trapped ion qubits, a relatively new qubit technology, ... ” https://www.forbes.com/sites/moorinsights/2019/09/16/quantum-computer-battle-royale-upstart-ions-versus-old-guard-superconductors/ …
      3 replies 1 retweet 22 likes
      Show this thread
    2. michael_nielsen‏ @michael_nielsen Sep 16
      • Report Tweet
      Replying to @dabacon

      Milburn and Yamamoto (independently) wrote papers ~1987ish about using photons to quantum compute, using nonlinear optical materials. And there were gestures before that.

      1 reply 0 retweets 9 likes
    3. Peter McMahon‏ @peterlmcmahon Sep 16
      • Report Tweet
      Replying to @michael_nielsen @dabacon

      @michael_nielsen Could you please post the two references you had in mind? (I thought @dabacon was referring to Cirac and Zoller, PRL 74, 4091 (1995), so I'm very curious now!)

      1 reply 0 retweets 1 like
    4. dabacon‏ @dabacon Sep 16
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      Replying to @peterlmcmahon @michael_nielsen

      Maybe: K. Igeta and Y. Yamamoto "Quantum Mechanical Computers with single Atom and Photon Fields " in Technical Digest of the XVI international Conference on Quantum Electronics, IQEC'88 pp.310

      1 reply 0 retweets 3 likes
    5. dabacon‏ @dabacon Sep 16
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      Replying to @dabacon @peterlmcmahon @michael_nielsen

      Milburn has a fully optical Fredkin gate, but I'm this isn't a full quantum computer "Quantum optical Fredkin gate" G. J. Milburn Phys. Rev. Lett. 62, 2124 – Published 1 May 1989https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.62.2124 …

      1 reply 0 retweets 4 likes
      michael_nielsen‏ @michael_nielsen Sep 16
      • Report Tweet
      Replying to @dabacon @peterlmcmahon

      Yeah, that's the right reference. IIRC - it's been a long time - it's easy to turn that gate into a full QC proposal. The nonlinear interaction needed for the Fredkin gate is the hard bit. I'm not sure I ever read the Yamamoto paper, but I was told content similar.

      9:05 PM - 16 Sep 2019
      • 3 Likes
      • Josh Combes Peter Morgan Peter McMahon
      1 reply 0 retweets 3 likes
        1. michael_nielsen‏ @michael_nielsen Sep 16
          • Report Tweet
          Replying to @michael_nielsen @dabacon @peterlmcmahon

          (This is all such ancient history...)

          0 replies 0 retweets 3 likes
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