Suppressed Charge Dispersion via Resonant Tunneling in a Single-Channel Transmon
Anders Kringhøj, Bernard van Heck, T. W. Larsen, Oscar Erlandsson, Deividas Sabonis, Peter Krogstrup, Lucas Casparis, K. D. Petersson, C. M. Marcus
Abstract
We demonstrate strong suppression of charge dispersion in a semiconductor-based transmon qubit across Josephson resonances associated with a quantum dot in the junction. On resonance, dispersion is drastically reduced compared to conventional transmons with corresponding Josephson and charging energies. We develop a model of qubit dispersion for a single-channel resonance, which is in quantitative agreement with experimental data.
Topics & Concepts
TransmonQuantum tunnellingCharge qubitResonance (particle physics)PhysicsQubitDispersion (optics)Josephson effectPhase qubitCharge (physics)Condensed matter physicsFlux qubitSemiconductorQuantumAtomic physicsSuperconductivityOptoelectronicsQuantum mechanicsQuantum and electron transport phenomenaQuantum Information and CryptographySemiconductor Quantum Structures and Devices