An Error Model for the Cirac-Zoller CNOT gate

Details An Error Model for the Cirac-Zoller CNOT gate An Error Model for the Cirac-Zoller CNOT gate

2009-09-21

arxiv.org/abs/0909.3783v1

Physics

Quantum Physics

10 pages, 1 figure. Accepted as a contributed oral communication in the QuantumComm 2009 International Conference on Quantum C

Scientific paper

In the framework of ion-trap quantum computing, we develop a characterization of experimentally realistic imperfections which may affect the Cirac-Zoller implementation of the CNOT gate. The CNOT operation is performed by applying a protocol of five laser pulses of appropriate frequency and polarization. The laser-pulse protocol exploits auxiliary levels, and its imperfect implementation leads to unitary as well as non-unitary errors affecting the CNOT operation. We provide a characterization of such imperfections, which are physically realistic and have never been considered before to the best of our knowledge. Our characterization shows that imperfect laser pulses unavoidably cause a leak of information from the states which alone should be transformed by the ideal gate, into the ancillary states exploited by the experimental implementation.

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