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 quartic extension of the twisting-and-turning Hamiltonian generates new unstable fixed points that accelerate short-time amplification of quantum fluctuations, yielding enhanced sensitivity within accessible coherence times.
Pair tunneling from dipolar interactions in a double-well Bose-Hubbard model induces ground-state parity modulations, qualitatively alters quantum phase transitions to NOON states, shifts critical points, and modifies macroscopic quantum self-trapping conditions.
citing papers explorer
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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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Instability-Enhanced Quantum Sensing with Tunable Multibody Interactions
A quartic extension of the twisting-and-turning Hamiltonian generates new unstable fixed points that accelerate short-time amplification of quantum fluctuations, yielding enhanced sensitivity within accessible coherence times.
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Equilibrium and dynamical quantum phase transitions in dipolar atomic Josephson junctions
Pair tunneling from dipolar interactions in a double-well Bose-Hubbard model induces ground-state parity modulations, qualitatively alters quantum phase transitions to NOON states, shifts critical points, and modifies macroscopic quantum self-trapping conditions.