The Ledger
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Preskill: Validated topological qubit may appear as soon as 2019
“And it's very ambitious, because at this point, it's not even clear they have a single qubit, but if that approach is successful, and we're, it's making progress, so I think we will see a validated Qubit of this type soon, maybe next year.”
Preskill: 50-to-100 qubit quantum computers will arrive in a couple years
“We think in a couple of years we'll have devices with about 50 qubits to a hundred, and we'll be able to control them pretty well, and that's an interesting range, because even though it's only 50 to a hundred qubits, doesn't sound like that big a deal, but th…”
Preskill: Quantum computers will enable tabletop toy spacetime in decades
“And in particular, what we're going to be doing with quantum computers and, you know, the other quantum technologies that are Becoming increasingly sophisticated in the next couple of decades is we'll be able to control very well, highly entangled, complex qua…”
Preskill: Nuclear-spin quantum sensors can exceed existing spatial resolution limits
“And again, using this technology of Nuclear spins, which I mentioned you can do it at room temperature, potentially. You can make a pretty good sensor, and it can potentially achieve higher sensitivity and spatial resolution. You look, look at things on shorte…”
Preskill: Quantum error correction is now achievable in the laboratory
“But at first that was just kind of a theorist fantasy. It was a little too far ahead of The technology, but, you know, 20 years later, the technology is catching up, so now this idea of quantum error correction has become something you can do in the lab.”
Preskill: Grover's algorithm only doubles tractable cities in traveling salesman problems
“And in practice, it's not that big a deal. What it means is that, you know, if you have the same processing speed, you can handle about you know, twice as many cities before the problem becomes too hard to solve as you could if you were using a classical proce…”
Preskill: Current quantum computers are too small for proposed algorithms
“We have algorithms that have been proposed, but, which we can't really run currently, because our quantum computers aren't big enough, on the scale that's needed to solve problems really, people really care about.”
Preskill: Current quantum tech achieves gate error rates around a few parts per thousand
“More or less with the technology we have now, you can have a gate error rate of a few parts in a thousand, you know.”
Preskill: Superconducting qubit coherence times grew 10x every three years
“And for the superconducting circuits, those coherence times have increased about a factor of 10 every three years, going back 15 years or so.”
Preskill: Superconducting circuits execute gates faster than trapped-ion qubits
“They have the advantage of being faster than the time to take the cycle time, the time to do a gate is faster than with the trapped ions.”
Preskill: Quantum computers can break both RSA and elliptic curve cryptography
“RSA, which is one of the ones that's widely used, as typically practiced today, the, to break it, you'd have to do something like factor a number, which is Over 2000 bits long to 20 48. And that's, you know, that's too hard to do now. But that's what quantum c…”