Spin Kerr-cat qubits encode information in the lowest levels of a Z2-symmetric nuclear-spin Hamiltonian in quadrupolar nuclei to achieve first-order dephasing suppression, yielding estimated T2* of 100 s for 123Sb in silicon and 99% two-qubit gate fidelity with quadrupolar enhancement.
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A single dilution refrigerator hosts decoupled superconducting qubits and spin ensembles with magnetic crosstalk suppressed by over eight orders of magnitude.
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Spin Kerr-cat qubits
Spin Kerr-cat qubits encode information in the lowest levels of a Z2-symmetric nuclear-spin Hamiltonian in quadrupolar nuclei to achieve first-order dephasing suppression, yielding estimated T2* of 100 s for 123Sb in silicon and 99% two-qubit gate fidelity with quadrupolar enhancement.
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Experimental setup for the combined study of spin ensembles and superconducting quantum circuits
A single dilution refrigerator hosts decoupled superconducting qubits and spin ensembles with magnetic crosstalk suppressed by over eight orders of magnitude.