Exact gate-sequences for universal quantum computation using the XY-interaction alone

Details Exact gate-sequences for universal quantum computation using the XY-interaction alone Exact gate-sequences for universal quantum computation using the XY-interaction alone

2001-12-03

arxiv.org/abs/quant-ph/0112014v2

Phys. Rev. A, Vol. 65 (5), 052330 (2002)

Physics

Quantum Physics

6 pages, 5 figures

Scientific paper

10.1103/PhysRevA.65.052330

In a previous publication [1] we showed that it is possible to implement universal quantum computation with the anisotropic XY-Heisenberg exchange acting as a single interaction. To achieve this we used encodings of the states of the computation into a larger Hilbert space. This proof is non- constructive, however, and did not explicitly give the trade-offs in time that are required to implement encoded single qubit operations and encoded two-qubit gates. Here we explicitly give the gate-sequences needed to simulate these operations on encoded qubits and qutrits (three-level systems) and analyze the trade-offs involved. We also propose a possible layout for the qubits in a triangular arrangement.

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