Unimon qubit
Eric Hyypp\"a, Suman Kundu, Chun Fai Chan, Andr\'as Gunyh\'o, Juho, Hotari, David Janzso, Kristinn Juliusson, Olavi Kiuru, Janne Kotilahti,, Alessandro Landra, Wei Liu, Fabian Marxer, Akseli M\"akinen, Jean-Luc, Orgiazzi, Mario Palma, Mykhailo Savytskyi, Francesca Tosto

TL;DR
The paper introduces the unimon, a superconducting qubit with high non-linearity and noise insensitivity, demonstrating promising coherence times and gate fidelities suitable for scalable quantum computing.
Contribution
The unimon qubit design combines high non-linearity and noise insensitivity with a simple structure, advancing superconducting qubit technology for practical quantum computing.
Findings
Achieved high anharmonicity at optimal operation points.
Demonstrated 99.9% and 99.8% fidelity for 13-ns single-qubit gates.
Energy relaxation time T₁ is stable around 10 microseconds.
Abstract
Superconducting qubits are one of the most promising candidates to implement quantum computers. The superiority of superconducting quantum computers over any classical device in simulating random but well-determined quantum circuits has already been shown in two independent experiments and important steps have been taken in quantum error correction. However, the currently wide-spread qubit designs do not yet provide high enough performance to enable practical applications or efficient scaling of logical qubits owing to one or several following issues: sensitivity to charge or flux noise leading to decoherence, too weak non-linearity preventing fast operations, undesirably dense excitation spectrum, or complicated design vulnerable to parasitic capacitance. Here, we introduce and demonstrate a superconducting-qubit type, the unimon, which combines the desired properties of high…
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Taxonomy
TopicsQuantum Mechanics and Applications
