Reversible computing

• Lecture on reversible computing from Science University of Copenhagen
• Reversible computing escapes the lab - IEEE Spectrum feature

  Landauer’s limit gives a theoretical minimum for how much energy information erasure costs, but there is no maximum. Today’s CMOS implementations use more than a thousand times as much energy to erase a bit than is theoretically possible. That’s mostly because transistors need to maintain high signal energies for reliability, and under normal operation that all gets dissipated as heat. To avoid this problem, many alternative physical implementations of reversible circuits have been considered, including superconducting computers, molecular machines, and even living cells.