Superconducting phase qubit based on the Josephson oscillator with strong anharmonicity

Abstract

We propose a superconducting phase qubit on the basis of the radio-frequency SQUID with the screening parameter value ${\beta }_L=(2\pi /{\Phi }_0)L{I}_c\approx 1$, biased by a half flux quantum ${\Phi }_e={\Phi }_0/2$. Significant anharmonicity ($>30$) can be achieved in this system due to the interplay of the cosine Josephson potential and the parabolic magnetic-energy potential that ultimately leads to the quartic polynomial shape of the well. The two lowest eigenstates in this global minimum perfectly suit for the qubit which is insensitive to the charge variable, biased in the optimal point and allows an efficient dispersive readout. Moreover, the transition frequency in this qubit can be tuned within an appreciable range allowing variable qubit-qubit coupling.

5 pages incl. 5 figures

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Cited by in corpus (10)

• Quasiparticle relaxation of superconducting qubits in the presence of flux
• Quantum Superinductor with Tunable Non-Linearity
• Dynamical Autler-Townes control of a phase qubit
• Engineering Purely Nonlinear Coupling with the Quarton
• Fragility of multi-junction flux qubits against quasiparticle tunneling
• Superconducting qubit manipulated by fast pulses: experimental observation of distinct decoherence regimes
• Period-doubling-bifurcation readout for a Josephson qubit
• Optimization of Junction and Bias Parameters in readout of Phase Qubit
• The quartic Blochnium: an anharmonic quasicharge superconducting qubit
• Resonant effects in a SQUID qubit subjected to non adiabatic changes