Globally controlled quantum wires for perfect qubit transport, mirroring and computing

Details Globally controlled quantum wires for perfect qubit transport, mirroring and computing Globally controlled quantum wires for perfect qubit transport, mirroring and computing

2006-01-18

arxiv.org/abs/quant-ph/0601120v2

Physics

Quantum Physics

Shortened 5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.97.090502

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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