Optimal generation of single-qubit operation from an always-on interaction by algebraic decoupling

Details Optimal generation of single-qubit operation from an always-on interaction by algebraic decoupling Optimal generation of single-qubit operation from an always-on interaction by algebraic decoupling

2005-04-19

arxiv.org/abs/quant-ph/0504137v1

Phys. Rev. A 73, 022306 (2006)

Physics

Quantum Physics

5 pages, 1 figure

Scientific paper

10.1103/PhysRevA.73.022306

We present a direct algebraic decoupling approach to generate arbitrary single-qubit operations in the presence of a constant interaction by applying local control signals. To overcome the difficulty of undesirable entanglement generated by the untunable interaction, we derive local control fields that are designed to both drive the qubit systems back to unentangled states at the end of the time interval over which the desired single-qubit operation is completed. This approach is seen to be particularly relevant for the physical implementation of solid-state quantum computation and for the design of low-power pulses in NMR.

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