Strongly anharmonic flux-tunable transmon based on InAs-Al 2D heterostructure
arXiv:2503.12288 · doi:10.1038/s41467-025-67420-1
Abstract
The gatemon qubits, made of transparent superconducting-semiconducting Josephson junctions, typically have even weaker anharmonicity than the opaque AlOx-junction transmons. However, flux-frustrated gatemons can acquire a much stronger anharmonicity, originating from the interference of the higher-order harmonics of the supercurrent. Here we investigate this effect of enhanced anharmonicity in split-junction gatemon devices based on InAs-Al 2D heterostructure. We find that anharmonicity in excess of 100% can be routinely achieved at the half-integer flux sweet-spot without any need for electrical gating or excessive sensitivity to the offset charge noise. We verified that such intrinsically large anharmonicity enables our devices to be driven coherently with raw Rabi frequencies exceeding 100 MHz, without any pulse shaping, simplifying implementation and control compared to traditional gatemons and transmons. Furthermore, by analyzing a relatively high-resolution spectroscopy of the device transitions as a function of flux, we were able to extract fine details of the current-phase relation, to which transport measurements would hardly be sensitive. The strong anharmonicity of our anharmonic tunable transmons, along with their bare-bones design, can prove to be a precious resource that transparent superconducting-semiconducting junctions bring to quantum information processing.
References in corpus (33)
- Charge insensitive qubit design derived from the Cooper pair box
- Coherent control of macroscopic quantum states in a single-Cooper-pair box
- Suppressing Charge Noise Decoherence in Superconducting Charge Qubits
- Controlling the spontaneous emission of a superconducting transmon qubit
- A Semiconductor Nanowire-Based Superconducting Qubit
- Realization of microwave quantum circuits using hybrid superconducting-semiconducting nanowire Josephson elements
- Randomized benchmarking and process tomography for gate errors in a solid-state qubit
- Coherent manipulation of Andreev states in superconducting atomic contacts
- Superconducting Gatemon Qubit based on a Proximitized Two-Dimensional Electron Gas
- Life after charge noise: recent results with transmon qubits
- A Parity-Protected Superconductor-Semiconductor Qubit
- Relating Andreev Bound States and Supercurrents in Hybrid Josephson Junctions
- Asymmetric higher-harmonic SQUID as a Josephson diode
- Evolution of Nanowire Transmons and Their Quantum Coherence in Magnetic Field
- Gatemon Benchmarking and Two-Qubit Operation
- Superconducting proximity effect in epitaxial Al-InAs heterostructures
- Microscopic study of the Josephson supercurrent diode effect in Josephson junctions based on two-dimensional electron gas
- Anharmonicity of a Gatemon Qubit with a Few-Mode Josephson Junction
- Conduction Channels of an InAs-Al nanowire Josephson weak link
- Suppressed Charge Dispersion via Resonant Tunneling in a Single-Channel Transmon
- Observation of vanishing charge dispersion of a nearly-open superconducting island
- A gate-tunable, field-compatible fluxonium
- Current-phase relations of InAs nanowire Josephson junctions: from interacting to multi-mode regimes
- Gate-Tunable Transmon Using Selective-Area-Grown Superconductor-Semiconductor Hybrid Structures on Silicon
- Charge-4e supercurrent in a two-dimensional InAs-Al superconductor-semiconductor heterostructure
- Scalable and robust quantum computing on qubit arrays with fixed coupling
- Gatemon qubit based on a thin InAs-Al hybrid nanowire
- Large Second-Order Josephson Effect in Planar Superconductor-Semiconductor Junctions
- Gatemon qubit on a germanium quantum-well heterostructure
- Gatemonium: A Voltage-Tunable Fluxonium
- Voltage-controlled synthesis of higher harmonics in hybrid Josephson junction circuits
- Few-mode to mesoscopic junctions in gatemon qubits
- Parity switching in a full-shell superconductor-semiconductor nanowire qubit