Protecting Superconducting Qubits with Universal Quantum Degeneracy Point
arXiv:1308.4926 · doi:10.1088/0953-2048/26/11/114002
Abstract
Low-frequency noise can induce serious decoherence in superconducting qubits. Due to its diverse physical origin, such noise can couple with the qubits either as transverse or as longitudinal noise. Here, we present a universal quantum degeneracy point approach that can protect an encoded qubit from arbitrary low-frequency noise. We further show that universal quantum logic gates can be performed on the encoded qubits with high fidelity. The proposed scheme can be readily implemented with superconducting flux qubits or with a qubit coupling with a superconducting resonator. Meanwhile, the scheme is also robust against small parameter spreads due to fabrication errors in the superconducting systems.
15 pages, 3 figures, submitted to the special issue on "Superconducting qubits: on the verge of scalability" in the Superconductor Science and Technology. This submission replaces arxiv:1101.2942
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