Globally controlled quantum wires for perfect qubit transport, mirroring and computing
arXiv:quant-ph/0601120 · doi:10.1103/PhysRevLett.97.090502
Abstract
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 complete mirror cycles are required to execute a quantum Fourier transform on qubits encoded within the q-wire.
Shortened 5 pages, 4 figures
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