In this proposal, we will develop ultra-coherent quantum devices based on intrinsic topological protection and multimode 3D cavities, addressing both Options 1a and 1b. We will demonstrate the first implementation of multi-qubit 0-� devices, measure coherence and gate fidelities, and improve two-qubit fidelities to exceed 99% by program end by optimizing device parameters, designing novel circuits, and employing optimal control. We will also explore more fundamentally the origins of topological protection in superconducting circuits, and will systematically search for circuits which exhibit protection and are free of spurious low-lying modes. These will be demonstrated experimentally when promising candidate circuits are found. We will also continue to explore heavy fluxonium, which we have recently demonstrated to have the largest T1 of any superconducting qubit, and will work to improve T2. This thrust has great promise because gates should be faster and simpler in this type of protected device. Finally, we will use 3D multimode cavities as quantum modules, as these provide hardware-efficient error correction with some basic level of computation. Multimode devices will also improve dramatically with coupling to a topologically protected qubit, as the qubit element is the primary source of gate errors.
|Effective start/end date||10/24/18 → 10/23/22|
- Princeton University (SUB0000298//W911NF1910016)
- Army Research Office (SUB0000298//W911NF1910016)
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