Curator's Take
AI Commentary
This article demonstrates a way to achieve true all‑to‑all connectivity in a superconducting flux‑qubit processor by using baseband‑driven adiabatic ZZ interactions mediated through a common cavity, allowing any pair of qubits to be entangled while the devices remain at their flux sweet spots. By tilting the quantization axes with low‑frequency drives rather than relying on resonant couplers, the scheme sidesteps the bulky wiring and control overhead that currently limit scalability, and numerical simulations predict coherent errors below 10⁻⁴ even when multiple gates run in parallel. If experimentally realized, this approach could dramatically simplify hardware layouts for large‑scale quantum simulators and error‑corrected processors, though practical implementation will need to confirm robustness against real‑world noise and fabrication variations.
— Mark Eatherly
Summary
Scalable superconducting quantum processors would benefit from high qubit connectivity, yet existing architectures connect neighbouring qubits via tunable couplers, which introduce substantial wiring and control overhead. Here, we propose a baseband-driven adiabatic ZZ gate that entangles any selected pair in a register of flux qubits coupled via a common cavity. The qubits stay dc-biased at their flux sweet spot. Strong drives applied selectively through local flux lines, at frequencies far below the qubit transitions, adiabatically tilt the quantization axes and generate an effective longitudinal ZZ interaction. The strength of the coupling is tunable and controlled by the amplitudes and relative phase of the drives rather than by any resonance condition. Numerical simulations give coherent gate errors below $10^{-4}$ over broad ranges of drive frequency, with comparable fidelities for two simultaneous gates in a four-qubit register. The protocol is robust against frequency fluctuations and remains effective even when many qubits are coupled to the cavity.