Gatemon Qubit Revisited for Improved Reliability and Stability
arXiv:2412.11611 · doi:10.1103/d68y-sqzm
Abstract
The development of quantum circuits based on hybrid superconductor-semiconductor Josephson junctions holds promise for exploring their mesoscopic physics and for building novel superconducting devices. The gate-tunable superconducting transmon qubit (gatemon) is the paradigmatic example of such a superconducting circuit. However, gatemons typically suffer from unstable and hysteretic qubit frequencies with respect to the applied gate voltage and reduced coherence times. Here we develop methods for characterizing these challenges in gatemons and deploy these methods to compare the impact of shunt capacitor designs on gatemon performance. Our results indicate a strong frequency- and design-dependent behavior of the qubit stability, hysteresis, and dephasing times. Moreover, we achieve highly reliable tuning of the qubit frequency with 1 MHz precision over a range of several GHz, along with improved stability in grounded gatemons compared to gatemons with a floating capacitor design.
13 pages, 12 figures
References in corpus (35)
- Charge insensitive qubit design derived from the Cooper pair box
- A Quantum Engineer's Guide to Superconducting Qubits
- Quantum error correction below the surface code threshold
- Tunable Supercurrent Through Semiconductor Nanowires
- AC-Stark Shift and Dephasing of a Superconducting Qubit Strongly Coupled to a Cavity Field
- A Semiconductor Nanowire-Based Superconducting Qubit
- Surface participation and dielectric loss in superconducting qubits
- Realization of microwave quantum circuits using hybrid superconducting-semiconducting nanowire Josephson elements
- Realization of high-fidelity CZ and ZZ-free iSWAP gates with a tunable coupler
- Superconducting Gatemon Qubit based on a Proximitized Two-Dimensional Electron Gas
- Scalable quantum circuit and control for a superconducting surface code
- Coherent manipulation of an Andreev spin qubit
- Sensitive SQUID magnetometry for studying nano-magnetism
- Tunable Superconducting Qubits with Flux-Independent Coherence
- Quantum coherent control of a hybrid superconducting circuit made with graphene-based van der Waals heterostructures
- High-Fidelity, Frequency-Flexible Two-Qubit Fluxonium Gates with a Transmon Coupler
- High fidelity two-qubit gates on fluxoniums using a tunable coupler
- A Parity-Protected Superconductor-Semiconductor Qubit
- Josephson-junction infrared single-photon detector
- Evolution of Nanowire Transmons and Their Quantum Coherence in Magnetic Field
- Gatemon Benchmarking and Two-Qubit Operation
- Perspective on traveling wave microwave parametric amplifiers
- Storage and on-demand release of microwaves using superconducting resonators with tunable coupling
- A gate-tunable, field-compatible fluxonium
- Enhancing Dispersive Readout of Superconducting Qubits Through Dynamic Control of the Dispersive Shift: Experiment and Theory
- Ultrastrong coupling dynamics with a transmon qubit
- Gate-Tunable Transmon Using Selective-Area-Grown Superconductor-Semiconductor Hybrid Structures on Silicon
- Superconducting resonators with voltage-controlled frequency and nonlinearity
- A gate tunable transmon qubit in planar Ge
- Magnetic-Field-Compatible Superconducting Transmon Qubit
- Mitigation of quasiparticle loss in superconducting qubits by phonon scattering
- On-demand driven dissipation for cavity reset and cooling
- The hybrid Josephson rhombus: A superconducting element with tailored current-phase relation
- Few-mode to mesoscopic junctions in gatemon qubits
- Gatemon Qubit Revisited for Improved Reliability and Stability