Quantum computing with molecular magnets
Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
Available online 7 March 2008.
We discuss the potential of molecular magnets as the building blocks of a quantum computer. The simplification in the control procedure for the quantum gates in many-spin systems coming from the high symmetry is shown to lead to a relatively simple way to address the spin degrees of freedom in molecular magnets. The advantage of an anisotropic effective spin interaction in memory applications is demonstrated on the example of the Grover quantum search algorithm in a generic easy-axis molecular magnet. Electric control of the coupling between the spins is shown to enable two-qubit quantum gates in polyoxometalates.
We discuss the potential of single-molecule magnets as the building blocks of quantum information processing devices. We review the requirements for building a quantum computer and the properties of single-molecule magnets that can play a role in fulfilling them.
Keywords: Single molecule magnets; Quantum computing
Fig. 1. Numerical evaluation of the average fidelity of quantum gate as a function of the gate time τgate and the ratio of indirect exchange coupling J1 between the vanadyl groups and the coupling of vanadyl groups to the central core JC. The solid lines track the gate parameters that lead to an ideal gate in the approximation of the direct control of nC.