Hybrid Quantum Computation

Details Hybrid Quantum Computation Hybrid Quantum Computation

2010-08-06

arxiv.org/abs/1008.1118v2

Phys. Rev. A 83, 022317 (2011)

Physics

Quantum Physics

14 pages, 5 figures, 1 table

Scientific paper

10.1103/PhysRevA.83.022317

We present a hybrid model of the unitary-evolution-based quantum computation model and the measurement-based quantum computation model. In the hybrid model part of a quantum circuit is simulated by unitary evolution and the rest by measurements on star graph states, thereby combining the advantages of the two standard quantum computation models. In the hybrid model, a complicated unitary gate under simulation is decomposed in terms of a sequence of single-qubit operations, the controlled-Z gates, and multi-qubit rotations around the z-axis. Every single-qubit- and the controlled-Z gate are realized by a respective unitary evolution, and every multi-qubit rotation is executed by a single measurement on a required star graph state. The classical information processing in our model only needs an information flow vector and propagation matrices. We provide the implementation of multi-control gates in the hybrid model. They are very useful for implementing Grover's search algorithm, which is studied as an illustrating example.

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