Realization of Superadiabatic Two-qubit Gates Using Parametric Modulation in Superconducting Circuits

Fast, robust two-qubit gate operation with low susceptibility to crosstalk are the key to scalable quantum-information processing. A parametrically driven gate is inherently insensitive to crosstalk, while superadiabatic control can speed up the gate without losing accuracy. We propose and experimentally implement superadiabatic two-qubit gates using parametric modulation on superconducting quantum circuits. Our results demonstrate the preservation of adiabaticity at a gate speed close to the quantum limit, in addition to robustness against control instability. We demonstrate a controlled-Z gate with an error rate of 5.8%, mainly limited by qubit decoherence, promising future improvement and scalable implementation.