New Quantum Computing Paradigm Could Make all the Difference

Published 2024-08-10
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A new approach to quantum computing -- working with photons, or "photonic computing" -- has recently attracted a lot of attention, not least because I've been talking about it, cough. But there's something I haven't mentioned, which is that photonic quantum computing uses a fundamentally different method -- measurement-based quantum computing -- that could push forward its competitors as well. It's a somewhat technical story, but I've tried my best to give you the summary.

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All Comments (21)
  • @HammerOn-bu7gx
    One of things I like about your work, is that when you don't know, you say so. Thank you!
  • @Whysicist
    “Pushing around a bump under the carpet” - Priceless! Next book might be, “Saying of Sabine”. More, pls. Thank you for being you.
  • @aidanclarke6106
    Hi Sabine. I love your content and your honesty, but could you add some more "fundamental" stuff as well ? Just like in the "good old days" ? 😅 Like "what does this equation mean" and so on. I would really appreciate. Lots of love from France ❤❤❤
  • @SuperFredAZ
    As a retired engineer Quantum Computing feels like something that will always be 25 years away.
  • @jayernoud9334
    “Quantum technology evangelist” had me in stitches 😂
  • I can say with some degree of frustration that i have understood nothing described here. Even after watching it twice.
  • @seanb3516
    Photonic Computing was an idea in the early 1980's. At least for me when I was a kid. Obviously you could change the CPU architecture simply by using holographic plates. Thermal control would be much better and different frequencies of light can be utilized. Electrons do not have different 'frequencies', just different 'intensities', whereas light has both degrees of freedom.
  • @gandru10
    One thing worth mentioning is that in order for the measurement-based model to be universal (i.e. for it to be able to do any computation that can also be achieved in the gate-based model), one has to do adaptive measurements. This means that you measure one qubit, record the outcome of the measurement and then based on what that outcome is you will measure the next qubit one way or another (in say the Pauli X basis for a 0 outcome of the first measurement, or in a Pauli Y basis for a 1 outcome). This makes implementing the measurement-based model tricky, because you can't just measure all the qubits in parallel at the same time; instead, you will measure some of the qubits, then use the information from the measurement outcomes to measure some of the other qubits and so on. Unfortunately, measurement-based computations which do allow for a high degree of parallelism are usually not that interesting. For instance, a family of quantum computations where the measurement-based model allows for fully parallel measurement is Clifford computation. However, Clifford computation is efficiently simulatable on a classical computer, so it would offer no quantum advantage whatsoever. That all being said, it does indeed seem that the photonic architecture is the best suited for a measurement-based approach. We'll see how well they handle this adaptivity issue. It's also worth mentioning, that the other architectures (like ion traps or superconducting qubits) already have some capability to do measurement-based computations. They can do what are called "mid-circuit measurements" or "classically-controlled feedback" where you can measure some of your qubits mid circuit and then, depending on the measurement outcome, decide what gates you'll apply to your remaining, unmeasured qubits. These mid-circuit measurements tend to be very noisy (introduce errors in the computation), so you can't do too many of them without completely ruining the computation. Though this will likely improve as the technology gets better. I should also say that mid-circuit measurements are necessary for eventually achieving fault-tolerant quantum computation, since these mid-circuit measurements will be the ones used to determine whether errors have occurred and how to correct them (in that context they're called syndrome measurements).
  • The word "electron" was also coined in 1891 by Irish physicist G. J. Stoney. It's a combination of the words "electric" and "ion", with the suffix "-on" coming from the names of charged particles, such as "ion", "cation", and "anion". The suffix "-on" is now used to name other subatomic particles, like protons and neutrons. The name "electron" was later applied to the light particle discovered by J.J. Thomson that carried an electric charge. The many applications of electrons moving in semiconductors or near a vacuum are called "electronics".
  • @MrPlusses
    Shill Marketing, also known as stealth marketing or buzz marketing, is a marketing strategy that advertises a product to people without them knowing they are being marketed.
  • @vivekpraseed918
    Neven's law says that quantum computing will grow at a double exponential pace every next year
  • @yeroca
    So no gates at all? I don't know how you "program" the thing, then. Guess I need to do some reading.
  • @AutisticThinker
    I didn't really believe Open AI was going to release an AI (you can chat with) anytime soon either; and I'm a senior software developer. One major success and that industry will bloom new startups all over the place.
  • I agree with your comparison of quantum computing and fusion. Aa always, your level of honesty and clarity puts other science news outlets to shame.
  • @anearthian894
    Complexity of frontier of science since Newton: 🚀🚀🚀🚀 Human brain since Newton: +1 Neuron
  • @12time12
    Interestingly, several countries coordinated recently to establish strict security controls on quantum computers and theur components. My gut feeling at the time was that something happened in terms of a major advance, perhaps it was this as Australia was on the list of countries.
  • no matter what is the outcome, sabine can sell us some advertisements
  • @TessaBain
    The fact that the abbreviation for "quantum technology evangelist" is QTE is quite fitting. That QTE is as worthless as the ones in movies pretending to be video games.
  • @KryptonianAI
    Something is brewing? It’s called Sabine reporting on science! ❤