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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Swap tests on ancilla qubits project Fock and coherent states onto NOON and entangled coherent states inside a Mach-Zehnder interferometer, recovering Heisenberg scaling while tolerating biased ancilla phase-flip noise.
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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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Swap-test interferometry with biased ancilla noise
Swap tests on ancilla qubits project Fock and coherent states onto NOON and entangled coherent states inside a Mach-Zehnder interferometer, recovering Heisenberg scaling while tolerating biased ancilla phase-flip noise.