Error-Tolerant Amplification and Simulation of the Ultrastrong-Coupling Quantum Rabi Model
arxiv(2024)
摘要
Cat-state qubits formed by photonic cat states show great promise for
hardware-efficient universal quantum computing. We demonstrate that cat-state
qubits are also promising for error-tolerant simulations of the quantum Rabi
model (and its varieties) to enhance the coupling strength between the
cat-state qubit and a cavity, to reach the ultrastrong-coupling regime. This
allows us to explore several fascinating quantum phenomena relying on the
counter-rotating interaction. A benefit from biased-noise cat qubits is that
the two main error channels (frequency and amplitude mismatches) are both
exponentially suppressed. Therefore, the simulation protocols are robust
against parameter errors of the parametric drive which determines the
projection subspace. We analyze three examples: (i) collapse and revivals of
quantum states; (ii) hidden symmetry and tunneling dynamics; and (iii)
pair-cat-code computation.
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