Decoherence in Josephson Qubits from Dielectric Loss

Details Decoherence in Josephson Qubits from Dielectric Loss Decoherence in Josephson Qubits from Dielectric Loss

2005-07-26

arxiv.org/abs/cond-mat/0507622v1

Physics

Condensed Matter

Materials Science

shortened version submitted to PRL

Scientific paper

10.1103/PhysRevLett.95.210503

Dielectric loss from two-level states is shown to be a dominant decoherence source in superconducting quantum bits. Depending on the qubit design, dielectric loss from insulating materials or the tunnel junction can lead to short coherence times. We show that a variety of microwave and qubit measurements are well modeled by loss from resonant absorption of two-level defects. Our results demonstrate that this loss can be significantly reduced by using better dielectrics and fabricating junctions of small area $\lesssim 10 \mu \textrm{m}^2$. With a redesigned phase qubit employing low-loss dielectrics, the energy relaxation rate has been improved by a factor of 20, opening up the possibility of multi-qubit gates and algorithms.

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