Quantum design for advanced qubits: plasmonium
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Abstract
: The increasingly complex quantum electronic circuits with a number of coupled quantum degrees of freedom will become intractable to be simulated on classical computers, and requires quantum computers for an efficient simulation. In turn, it will be a central concept in quantum-aided design for next-generation quantum processors. Here, we demonstrate variational quantum eigensolvers to simulate superconducting quantum circuits with varying parameters covering a plasmon-transition regime, which reveals an advanced post-transmon qubit, “plasonium”. We fabricate this new qubit and demonstrate that it exhibits not only high single-and two-qubit gate fidelities (99.85(1)% and 99.58(3)%, respectively), but also a shrinking physical size (by 60%) and a larger anharmonicity (by 50%) than the transmon, which can bring a number of advantages for scaling up multi-qubit devices. Our work opens the way to designing advanced quantum processors using existing quantum computing resources.