Physics – Quantum Physics
Scientific paper
2003-10-27
International Journal of Quantum Information 3, 441-462 (2005)
Physics
Quantum Physics
11 pages, 11 figures
Scientific paper
We analyze the influence of errors on the implementation of the quantum Fourier transformation (QFT) on the Ising quantum computer (IQC). Two kinds of errors are studied: (i) due to spurious transitions caused by pulses and (ii) due to external perturbation. The scaling of errors with system parameters and number of qubits is explained. We use two different procedures to fight each of them. To suppress spurious transitions we use correcting pulses (generalized $2\pi k$ method) while to suppress errors due to external perturbation we use an improved QFT algorithm. As a result, the fidelity of quantum computation is increased by several orders of magnitude and is thus stable in a much wider range of physical parameters.
Celardo Giuseppe Luca
Pineda Carlos
Znidaric Marko
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