Extensible Circuit-QED Architecture via Amplitude and Frequency Variable Microwaves
Abstract
We introduce a circuit-QED architecture combining xC;xed-frequency qubits and microwave-driven couplers. In the appropriate frame, the drive parameters appear as tunable knobs enabling selective two-qubit coupling and coherent-error suppression. We moreover introduce a set of controlledphase gates based on drive-amplitude and drive-frequency modulation. We develop a theoreticalframework based on Floquet theory to model microwave-activated interactions with time-dependent drive parameters, which we also use for pulse shaping. We perform numerical simulations of the gate xC;delity for realistic circuit parameters, and discuss the impact of drive-induced decoherence. We estimate average gate xC;delities beyond 99.9 for all-microwave controlled-phase operations withgate times in the range 50120 ns. These two-qubit gates can operate over a large drive-frequency bandwidth and in a broad range of circuit parameters, thereby improving extensibility. We address the frequency allocation problem for this architecture using perturbation theory, demonstrating that qubit, coupler and drive frequencies can be chosen such that undesired static and driven interactionsremain bounded in a multi-qubit device. Our numerical methods are useful for describing the timeevolution of driven systems in the adiabatic limit, and are applicable to a wide variety of circuit-QED setups.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 09, 2022
- Accession Number
- AD1208809
Entities
Organizations
- MIT Lincoln Laboratory