受控非操作的量子并行性：器件性能评价的实验判据
Quantum parallelism of the controlled-NOT operation: an experimental criterion for the evaluation of device performance
摘要：
结果表明，量子控制非门同时执行三个不同的条件本地操作的逻辑功能。这些局部操作中的每一个可以通过测量四个局部输入和四个局部输出的对应真值表来验证。然后，可以在一组三个简单的实验测试中直接观察到门的量子并行性，其中每个测试都有一个清晰直观的经典逻辑运算解释。具体来说，如果三个经典操作的平均保真度超过2/3，则实现量子并行。因此，它是可能的，以评估必要的量子并行性的实验控制非门测试只有三个典型的操作进行的门。
英文摘要：
It is shown that a quantum controlled-NOT gate simultaneously performs the logical functions of three distinct conditional local operations. Each of these local operations can be verified by measuring a corresponding truth table of four local inputs and four local outputs. The quantum parallelism of the gate can then be observed directly in a set of three simple experimental tests, each of which has a clear intuitive interpretation in terms of classical logical operations. Specifically, quantum parallelism is achieved if the average fidelity of the three classical operations exceeds 2/3. It is thus possible to evaluate the essential quantum parallelism of an experimental controlled-NOT gate by testing only three characteristic classical operations performed by the gate.
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