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The high-coherence fluxonium qubit
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We report superconducting fluxonium qubits with coherence times largely limited by energy relaxation and reproducibly satisfying T2 > 100 microseconds (T2 > 300 microseconds in one device). Moreover, given the state of the art values of the surface loss tangent and the 1/f flux noise amplitude, coherence can be further improved beyond 1 millisecond. Our results violate a common viewpoint that the number of Josephson junctions in a superconducting circuit -- over 100 here -- must be minimized for best qubit coherence. We outline how the unique to fluxonium combination of long coherence time and large anharmonicity can benefit both gate-based and adiabatic quantum computing.
Forward citations
Cited by 3 Pith papers
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Floquet Quasiparticle Poisoning of Frozonium
Dynamical freezing in a driven fluxonium circuit does not suppress quasiparticle-induced decay, and the paper identifies drive-frequency operating windows that balance freezing quality against pair-breaking and tunnel...
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Can a quantum circuit detect the Unruh effect?
A frequency-chirped fluxonium Λ-system is predicted to accumulate a geometric phase from the timelike Unruh effect, shifting its ground-state population by ~10% within 530 ns.
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Universal gates for protected superconducting qubits using optimal control
Optimal control can generate high-fidelity, charge-robust microwave pulses for heavy-fluxonium and 0-pi protected superconducting qubits, in simulation, by temporarily routing population through excited states.
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