On Fri, Nov 15, 2024 at 8:05 AM John Clark <[email protected]> wrote:
> On Thu, Nov 14, 2024 at 3:26 PM Brent Meeker <[email protected]> > wrote: > > *>> The idea of entropy is inextricably linked with information, and >>> information is physical; Landauer's principle allows us to calculate the >>> fundamental lower bound on the energy needed to erase one bit of >>> information, it is kT ln 2, where k is the Boltzmann constant and T is the >>> temperature in degrees kelvin. At room temperature it's about 2.9 x 10^-21 >>> joules per bit. That sure sounds physical to me.* >> >> > > >*Sounds like a theory to me. * >> "https://arxiv.org/html/2402.15812v1"; >> <https://arxiv.org/html/2402.15812v1> >> > > *Sounds like a theory to me too, maybe it's true, but even if it is I note > that they include with: * > > *"**Although our erasing strategy can operate in a regime that goes > beyond the Landauer limit, the statement that the erasure of information > always produces heat still holds true. In fact, as discussed in Subsec. III > B, the memory always ends up in the ground state by releasing some amount > of heat. In this context, the present erasure protocol can also be > understood as a perfect cooling process. In this context, the present > erasure protocol can also be understood as a perfect cooling process. Our > results strengthen the view that quantum processes can surpass certain > classical thermodynamic limits, and may contribute to the progress of the > emerging field of green computing"* > > *So information is still physical * > Information can be recorded on physical devices. Landauer says nothing more than that erasing this physical record requires energy. The physical record is not the information -- map and territory confusion yet again. Bruce -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/everything-list/CAFxXSLS0nza3qoX1ZreNZXhJf%3DD0JfH%2BaxvdLXNgPXwTGTryLw%40mail.gmail.com.
