I'm afraid that won't be enough. There's a lower limit on how much you can compute with a given amount of energy. If I recall correctly, switching a bit will co

I'm afraid that won't be enough. There's a lower limit on how much you can compute with a given amount of energy. If I recall correctly, switching a bit will cost at least ln(2)kT energy, or about 310^-21 joules at room temperature. According to Wikipedia[1], FM signals are minimally 10^-18 watt. If we have about a hundred antennas and assume a somewhat larger signal strength, we could thus viably use 10^-15 watt. Sadly, that will only allow us to switch 400000 bits per second[2], not nearly enough for any meaningful computation, let alone communication. Notice that I'm not talking about storing a few hundred thousand bits, I'm talking about switching them from 0 to 1 or vice versa. Adding two numbers will probably switch dozens of bits. And that is with equipment operating at the limit of what is possible by the laws of physics. So likely we'll end up a few factors thousand lower. A few hundreds of bits per second is probably enough for some RFID like system, but not for anything useful. 1: http://en.wikipedia.org/wiki/Orders_of_magnitude_(power)#attowatt_.2810.E2.88.9218_watt.29 http://en.wikipedia.org/wiki/Orders_of_magnitude_(power)#att... 2: http://www.wolframalpha.com/input/?i=1+bit+%2F+%28ln%282%29+*+boltzmann+constant+*+300K+%2F+%2810%5E-15+watt%29%29 http://www.wolframalpha.com/input/?i=1+bit+%2F+%28ln%282%29+...