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New paper on a quantum system that can only partially decohere, and therefore at long time has dynamics that are neither classical nor quantum: https://arxiv.org/abs/1911.11169 Understanding this system comes down to the statistical mechanics of a process that looks like this:pic.twitter.com/iAfZrbYM8b
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Still, the horror that Scott Aaronson describes, of seeing the financially/politically empowered deal with science, is a very real one.
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I can appreciate that this might be an instance of the internet doing a thing it loves to do: Take a quote by someone that's meant to be a folksy analogy, and then exclaim with exaggerated comic horror "Wait, this person LITERALLY believes X!?!?"https://twitter.com/gravity_levity/status/1224016628163190785 …
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Brian Skinner Retweeted
Arvind Krishna has a fully earned Ph.D. In Computer Engineering from the University of Illinois (1991). He was previously the head of IBM research and I assure you he actually knows more about how Quantum Computing works than anyone snidely commenting on this thread.
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Brian Skinner Retweeted
This is *sadly* for Brian, an example of a quote with not context. If you know the audience, you understand this was delivered as intended. As Scott himself mentions: "I...felt like they got a lot more out of it than the businesspeople who came to my & Jeremy O’Brien’s session".https://twitter.com/gravity_levity/status/1224016628163190785 …
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Read the horror that is Scott Aaronson's account of how quantum computing is discussed at Davos: https://www.scottaaronson.com/blog/#jan23 Here is a quote from a senior vice president at IBM:pic.twitter.com/WGg1MLxmxp
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Brian Skinner Retweeted
Malawian musician Gasper Nali playing his homemade instrument, the Babatoni.pic.twitter.com/DeOBWwEDDF
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"We're having an 80s party!" they said. "Send us a photo of yourself from the 80s! It'll be fun!" they said. Now this photo is on prominent display in the lobby of the building where I work.pic.twitter.com/JOcJi57hLH
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Brian Skinner Retweeted
Procrastination is a kind of time travel
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You guys, the party planning committee hit this one out of the parkpic.twitter.com/fZemlRXM5e
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Someone's getting a little punchy on the group overleafpic.twitter.com/mzEZJJiKSp
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25/25 Thank you for coming to my TED Talk. Here is a grainy photo of me haranguing other workshop participants about the virtue of boring materials.pic.twitter.com/8fqz7yEQu2
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24/ Modern experiments are getting better and better about probing this soupy-liquid at nanometer length scales and femtosecond time scales. These better "movies" might finally allow us to figure out what happens, in a huge class of "strongly correlated electron" situations.
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23/ Near the transition point electrons are somehow like a thick liquid: technically flowing, but poorly, and with their properties somehow arising from an interplay between their repulsion and the quantum hybridization between atom-centered wavefunctions.
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22/ Roughly speaking, this "Mott transition" happens when the concentration of dopants becomes high enough that it is easier energetically for electrons to be hybridized (in a quantum sense) between atoms than it is for them to each sit on one atom.
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21/ Finally, I'll end with the most studied-to-death material on earth: SILICON. We can do just about everything with silicon at this point, but there is one big thing we don't understand: its transition from insulating to conducting as a function of added ("dopant") atoms.
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20/ Second, STO can act like a metal even when the apparent mean-free-path of electrons (the distance electrons can travel before scattering off something) is even shorter than the inter-atomic distance. This is a violation of both quantum mechanics and common sense.
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19/ This aborted transition was understood in the 1960s, but returning to this material in the 2010s revealed more crazy things. First, STO can be a fairly robustsuperconductor with only a miniscule amount of added electrons. This is well beyond the purview of any theory we know.
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18/ This huge dielectric constant arises from a ferroelectric phase transition (a buckling-type instability within the atomic cell) that _almost_ happens, but is aborted by quantum fluctuations of the atom positions.
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17/ The poster child for the value of reconsidering old semiconductors is the crystal STRONTIUM TITANATE ("STO"). STO is a synthetic gemstone (you can buy it cheap online), which happens to have an enormous dielectric constant.
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