用于完美量子比特传输、镜像和计算的全局控制量子线
Globally controlled quantum wires for perfect qubit transport, mirroring and computing
摘要：
预期在许多量子计算机实现中将需要量子线（q线）来传输量子信息。在这里，我们描述了一种新的设计的q线与完美的传输使用均匀耦合的伊辛自旋链受到全球（严格施加）脉冲。除了允许单个量子比特的完美传输外，该设计还可以在导线内产生多重编码量子比特的完美“镜像”。我们进一步利用这种全局脉冲产生的完美镜像操作作为“时钟周期”，对这些多重编码的量子比特进行通用量子计算。我们演示了单量子位和双量子位量子逻辑门的操作，并表明只需要$N-1$完整的镜像周期就可以在q线内编码的$N$量子位上执行量子傅里叶变换。
英文摘要：
It is expected that quantum wires (q-wires), will be required to transport quantum information within many quantum computer implementations. Here we describe a new design for a q-wire with perfect transmission using a uniformly coupled Ising spin chain subject to global (homogeneously-applied) pulses. Besides allowing for perfect transport of single qubits, the design also yields the perfect ``mirroring'' of multiply encoded qubits within the wire. We further utilise this global-pulse generated perfect mirror operation as a ``clock cycle'' to perform universal quantum computation on these multiply encoded qubits. We demonstrate the operation of single and two-qubit quantum logic gates and show that only $N-1$ complete mirror cycles are required to execute a quantum Fourier transform on $N$ qubits encoded within the q-wire.
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