Correlation-induced suppression of decoherence in capacitively coupled Cooper-pair boxes

Details Correlation-induced suppression of decoherence in capacitively coupled Cooper-pair boxes Correlation-induced suppression of decoherence in capacitively coupled Cooper-pair boxes

2004-07-16

arxiv.org/abs/cond-mat/0407423v4

Phys. Rev. B 72, 144529 (2005).

Physics

Condensed Matter

Superconductivity

5 pages, 2 figures. Phys. Rev. B, in press

Scientific paper

10.1103/PhysRevB.72.144529

Charge fluctuations from gate bias and background traps severely limit the performance of a charge qubit in a Cooper-pair box (CPB). Here we present an experimentally realizable method to control the decoherence effects of these charge fluctuations using two strongly capacitively coupled CPBs. This coupled-box system has a low-decoherence subspace of two states. Our results show that the inter-box Coulomb correlation can help significantly suppress decoherence of this two-level system, making it a promising candidate as a logical qubit, encoded using two CPBs.

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