On Thursday, November 14, 2024 at 2:29:46 PM UTC-7 Bruce Kellett wrote:
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 If physical record is not information, then nothing was lost when the Library of Alexandria burned down. AG -- 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/659fb00c-2818-45af-9130-3c30d5bbc2ffn%40googlegroups.com.
