Seth Lloyd: Quantum Machine Learning

Seth Lloyd visited the Quantum AI Lab at Google LA to give a tech talk on “Quantum Machine Learning.” This talk took place on January 29, 2014.

Speaker Info:

Seth Lloyd is one of pioneers in the quantum information science with several seminal contributions to quantum computing, quantum communication, and quantum control. He developed the first quantum algorithms for efficient simulation of many-body systems at the quantum scale. He has also introduced the first realizable model for quantum computation and is working with a variety of groups to construct and operate quantum computers and quantum communication systems. Dr. Lloyd is the author of over a hundred and fifty scientific papers, and of `Programming the Universe,’ (Knopf, 2004). He is currently professor of quantum-mechanical engineering at MIT.


Machine learning algorithms find patterns in big data sets. This talk presents quantum machine learning algorithms that give exponential speed-ups over their best existing classical counterparts. The algorithms work by mapping the data set into a quantum state (big quantum data) that contains the data in quantum superposition. Quantum coherence is then used to reveal patterns in the data. The quantum algorithms scale as the logarithm of the size of the database.


  1. derstreber2 says:

    “I hope everybody is hearing these questions. These are all extreamly
    important questions.”

    I am crying inside right now.

  2. Sleepydog says:

    I wonder what the microphone in the middle is for…. :p

    thank you 🙂 thanks for teaching!

  3. Craig Talbert says:

    “Seth Lloyd visited the Quantum AI Lab at Google LA” //Quantum AI labs are
    so trendy these days.

  4. Midazc says:

    After Seth mentions the footnote from the 1929 paper, about alpha²+beta² =
    1, thinking about complex numbers, it comes to mind that he is actually
    talking about the unit circle. As the total probability is always 1 or
    100%, the radius of the complex number representing the total probability
    of the qubit being 0 or 1 needs to be 1, hence the unit circle, hence the
    quadratic members.

  5. Gaute Løken says:

    These silent question-pauses are making me nutts.. Wish Google would bother
    with microphones or at least texting the questions into their videos.

  6. Michael York says:

    It would seem we have moved to mapping interference patterns
    as Quantum Symphonies. representing Complex Systems.

  7. Demetri Salteris says:

    Lol, it’s like hearing 42 over and over again. We get the answers, but not
    the questions.

  8. BookTechTube says:

    Next time,

    Google Hangouts should….21dWill

    Be evolved

    So that other’s may attack this data

  9. AutFaciam says:

    – He considers himself a quantum mechanic.
    – Your quanta are broken, we fix them.

    The guy is fantastic :)

  10. JC Stanton says:

    been watching all this guy’s videos, must be the funniest quantum physicist
    out there, cracks me up every time. The bit about the remainder of the
    audience having both studied and not studied quantum physics and
    understanding it intuitively had me on the floor.

  11. applecom1de says:

    Anyone noticed that while lecturing, he at the same time managed to project
    himself sitting in the third row? Awesome guy!

  12. MrTweetyhack says:

    Haha. QM is based on an equation that “Nobody Knows”? I think I’ll just
    move over to polytheism now.

  13. etatoby says:

    You’d hope Google, of all companies, would bring an electronic whiteboard
    for the guy to use, so that it can be projected overhead and shown clearly
    in the video. But nope.

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