The Loss of fidelity due to quantum leakage for Josephson charge qubits

Details The Loss of fidelity due to quantum leakage for Josephson charge qubits The Loss of fidelity due to quantum leakage for Josephson charge qubits

2004-07-05

arxiv.org/abs/quant-ph/0407027v1

Modern Physics Letters B 19 (2005) 371-378

Physics

Quantum Physics

6 pages

Scientific paper

10.1142/S0217984905008268

In this paper we calculate the loss of fidelity due to quantum leakage for the Josephson charge qubit (JCQ) in virtue of the Mathieu functions. It is shown that for an present typical parameters of JCQ E_{J}/E_{ch}~0.02, the loss of the fidelity per elementary operation is about 10^(-4) which satisfy the DiVincenzo's low decoherence criterion. By appropriately improving the design of the Josephson junction, namely, decreasing E_{J}/E_{ch} to 0.01, the loss of fidelity per elementary operation can decrease to 10^(-6) even smaller.

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