Presto

Presto provides digital microwave generation and measurement for control and readout of superconducting qubits in quantum processors using a third-generation radio-frequency system-on-chip.

Key Features:

• Radio-frequency system-on-chip: Integrates a third-generation radio-frequency system-on-chip for digital microwave synthesis and analysis.
• High-frequency signal generation: Uses direct digital synthesis to generate signals up to 9 GHz across 16 synchronous output ports.
• Input/output configuration: Provides 16 DC-bias outputs, four inputs and four outputs for digital triggers/markers, and two continuous-wave outputs capable of synthesizing frequencies up to 15 GHz.
• Scalability and synchronization: Enables deterministic synchronization of multiple Presto units to scale control and measurement across larger qubit arrays.
• Analysis and low-latency feedback: Implements template matching (matched filtering) and low-latency feedback with measured latencies of 184–254 ns for rapid response.
• Python API and event sequencer: Exposes a Python API to configure firmware for pulse synthesis and analysis coordinated by an event sequencer.

Scientific Applications:

• Single-shot readout and active reset: Enables single-shot readout and active reset of individual superconducting qubits.
• Randomized benchmarking: Supports randomized benchmarking of single-qubit gates, reporting 99.972% gate fidelity limited by qubit coherence time.
• Two-qubit gate calibration: Facilitates calibration of two-qubit iSWAP gates for entangling operations.

Methodology:

Synchronous generation and analysis across multiple ports using direct digital synthesis; template matching (matched filtering) and low-latency feedback (184–254 ns); firmware-configurable pulse synthesis and analysis via a Python API coordinated by an event sequencer.