Universal quantum computation with spin-1/2 pairs and Heisenberg exchange

Details Universal quantum computation with spin-1/2 pairs and Heisenberg exchange Universal quantum computation with spin-1/2 pairs and Heisenberg exchange

2001-01-15

arxiv.org/abs/quant-ph/0101057v2

Physics

Quantum Physics

11 pages, 2 figures, accepted for publication in PRL

Scientific paper

10.1103/PhysRevLett.89.147902

An efficient and intuitive framework for universal quantum computation is presented that uses pairs of spin-1/2 particles to form logical qubits and a single physical interaction, Heisenberg exchange, to produce all gate operations. Only two Heisenberg gate operations are required to produce a controlled pi-phase shift, compared to 19 for exchange-only proposals employing three spins. Evolved from well-studied decoherence-free subspaces, this architecture inherits immunity from collective decoherence mechanisms. The simplicity and adaptability of this approach should make it attractive for spin-based quantum computing architectures.

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