论文标题
物理系统中计算率的普遍限制
A Universal Constraint on Computational Rates in Physical Systems
论文作者
论文摘要
常规计算具有许多散热源，但是其中之一 - 降落的限制 - 在每位擦除的1位熵的基本下限中置于基本下限。 “可逆计算”避免了这种耗散的来源，但是可以使用无耗散的计算？在本文中，提供了开放量子系统的一般证明，表明与环境热耦合的计算机必然会消散熵（因此是热量）。具体而言，获得了与绝热状态相对应的下限，其中每个计算操作的熵量与计算速率成正比。
Conventional computing has many sources of heat dissipation, but one of these--the Landauer limit--poses a fundamental lower bound of 1 bit of entropy per bit erased. 'Reversible Computing' avoids this source of dissipation, but is dissipationless computation possible? In this paper, a general proof is given for open quantum systems showing that a computer thermally coupled to its environment will necessarily dissipate entropy (and hence heat). Specifically, a lower bound is obtained that corresponds to the adiabatic regime, in which the amount of entropy dissipated per computational operation is proportional to the rate of computation.
