Spectator Errors in Tunable Coupling Architectures
arXiv:2108.11221
Abstract
The addition of tunable couplers to superconducting quantum architectures offers significant advantages for scaling compared to fixed coupling approaches. In principle, tunable couplers allow for exact cancellation of qubit-qubit coupling through the interference of two parallel coupling pathways between qubits. However, stray microwave couplings can introduce additional pathways which complicate the interference effect. Here we investigate the primary spectator induced errors of the bus below qubit (BBQ) architecture in a six qubit device. We identify the key design parameters which inhibit ideal cancellation and demonstrate that dynamic cancellation pulses can further mitigate spectator errors.
References in corpus (7)
- Mach-Zehnder Interferometry in a Strongly Driven Superconducting Qubit
- A tunable coupling scheme for implementing high-fidelity two-qubit gates
- Three Qubit Randomized Benchmarking
- Implementation of Conditional-Phase Gates based on tunable ZZ-Interactions
- Robust two-qubit gates in a linear ion crystal using a frequency-modulated driving force
- Coherence in quantum error-correcting codes
- Errors and pseudo-thresholds for incoherent and coherent noise