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Charge insensitive qubit design derived from the Cooper pair box

5 Pith papers cite this work. Polarity classification is still indexing.

5 Pith papers citing it
abstract

Short dephasing times pose one of the main challenges in realizing a quantum computer. Different approaches have been devised to cure this problem for superconducting qubits, a prime example being the operation of such devices at optimal working points, so-called "sweet spots." This latter approach led to significant improvement of $T_2$ times in Cooper pair box qubits [D. Vion et al., Science 296, 886 (2002)]. Here, we introduce a new type of superconducting qubit called the "transmon." Unlike the charge qubit, the transmon is designed to operate in a regime of significantly increased ratio of Josephson energy and charging energy $E_J/E_C$. The transmon benefits from the fact that its charge dispersion decreases exponentially with $E_J/E_C$, while its loss in anharmonicity is described by a weak power law. As a result, we predict a drastic reduction in sensitivity to charge noise relative to the Cooper pair box and an increase in the qubit-photon coupling, while maintaining sufficient anharmonicity for selective qubit control. Our detailed analysis of the full system shows that this gain is not compromised by increased noise in other known channels.

years

2026 4 2019 1

verdicts

UNVERDICTED 5

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representative citing papers

Superconducting qubits beyond the dispersive regime

cond-mat.mes-hall · 2019-07-14 · unverdicted · novelty 6.0

Develops a non-perturbative diagonalization formalism for transmon-resonator circuits yielding closed-form expressions for dressed frequencies and Kerr couplings valid beyond the dispersive regime.

SPICE-Q and Large-Scale Quantum Chip Production

quant-ph · 2026-06-16 · unverdicted · novelty 5.0

SPICE-Q is a proposed unified data-chain framework for co-optimizing process, layout, electromagnetic simulation, circuit quantization, noise, and yield in superconducting quantum processors.

Fabless Quantum Chip Design and Commercial Production

quant-ph · 2026-06-16 · unverdicted · novelty 4.0

Proposes a fabless-foundry ecosystem for superconducting quantum chips built on certified PDKs, SPICE-Q multiphysics modeling, parameterized cells, Q-EDA automation, and a quantum-IP market.

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