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Crypto and new computing strategies


[email protected] writes:


>> The Bekenstein Bound gives limits both on the expected maximum number
>> of quantum states encodable in a given volume of space and on the
>> expected maximum number os transitions between these states.  If this
>> bound holds (and it certainly seems to hold for EM fields), then a
>> probabilistic Turing machine will be able to simulate it.

	Can you give a reference for this Bekenstein bound?

	Thanks,
  		Bob Solovay