Quantum Computing in Molecular Magnets

Details Quantum Computing in Molecular Magnets Quantum Computing in Molecular Magnets

2000-11-23

arxiv.org/abs/cond-mat/0011415v2

Nature 410, 789 (2001)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, 2 figures, PDF, version published in Nature, typos corrected

Scientific paper

10.1038/35071024

Shor and Grover demonstrated that a quantum computer can outperform any classical computer in factoring numbers and in searching a database by exploiting the parallelism of quantum mechanics. Whereas Shor's algorithm requires both superposition and entanglement of a many-particle system, the superposition of single-particle quantum states is sufficient for Grover's algorithm. Recently, the latter has been successfully implemented using Rydberg atoms. Here we propose an implementation of Grover's algorithm that uses molecular magnets, which are solid-state systems with a large spin; their spin eigenstates make them natural candidates for single-particle systems. We show theoretically that molecular magnets can be used to build dense and efficient memory devices based on the Grover algorithm. In particular, one single crystal can serve as a storage unit of a dynamic random access memory device. Fast electron spin resonance pulses can be used to decode and read out stored numbers of up to 10^5, with access times as short as 10^{-10} seconds. We show that our proposal should be feasible using the molecular magnets Fe8 and Mn12.

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