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Interactions between quantum systems can cause "spin-flips" or state transitions and so implement arithmetic
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Incident photons can "read" state of system and so give I/O capabilities
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Quantum "bits" called qubits have another property as one has not only
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State |0> and state |1> but also
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Coherent states such as .7071*(|0> + |1>) which are equally in either state
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Lloyd describes how such coherent states provide new types of computing capabilities
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Natural random number as measuring state of qubit gives answer 0 or 1 randomly with equal probability
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As Feynman suggests, qubit based computers are natural for large scale simulation of quantum physical systems -- this is "just" analog computing
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