期刊
NPJ QUANTUM INFORMATION
卷 6, 期 1, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41534-019-0231-2
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资金
- Army Research Office [W911NF-14-1-0011, W911NF-18-1-0212]
- DoDMURI award [FP057123-C]
- Yale Institute of Nanoscience and Quantum Engineering under National Science Foundation [MRS1119826]
We present a protected superconducting qubit based on an effective circuit element that only allows pairs of Cooper pairs to tunnel. These dynamics give rise to a nearly degenerate ground state manifold indexed by the parity of tunneled Cooper pairs. We show that, when the circuit element is shunted by a large capacitance, this manifold can be used as a logical qubit that we expect to be insensitive to multiple relaxation and dephasing mechanisms.
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