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Recently Levy has shown that quantum computation can be performed using anABAB.. chain of spin-1/2 systems with nearest-neighbor Heisenberg interactions.Levy notes that all necessary elementary computational `gates' can be achievedby using spin-resonance techniques involving modulating the spin-spininteraction strength at high frequency. Here we note that, as an alternative tothat approach, it is possible to perform the elementary gates with simple,non-oscillatory pulses.Comment: 3 pages including 2 fig

physical review. a, atomic, molecular, and optical physics/physical review, a, atomic, molecular, and optical physics

Simple pulses for universal quantum computation with a Heisenberg<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ABAB</mml:mi></mml:math>chain

Simple pulses for universal quantum computation with a HeisenbergABABchain