# Hardware for Dynamic Quantum Computing

## TL;DR

This paper details the development of FPGA-based hardware, gateware, and software for real-time control and readout of superconducting qubits, enabling dynamic quantum experiments within coherence times.

## Contribution

It introduces a comprehensive hardware and software platform for real-time feedback and feedforward in superconducting qubit systems, advancing dynamic quantum information processing capabilities.

## Key findings

- Low-latency qubit state assignment with custom signal processing
- Reconfigurable FPGA-based control hardware for arbitrary pulse sequencing
- Capability for dynamic quantum experiments within qubit coherence times

## Abstract

We describe the hardware, gateware, and software developed at Raytheon BBN Technologies for dynamic quantum information processing experiments on superconducting qubits. In dynamic experiments, real-time qubit state information is fedback or fedforward within a fraction of the qubits' coherence time to dynamically change the implemented sequence. The hardware presented here covers both control and readout of superconducting qubits. For readout we created a custom signal processing gateware and software stack on commercial hardware to convert pulses in a heterodyne receiver into qubit state assignments with minimal latency, alongside data taking capability. For control, we developed custom hardware with gateware and software for pulse sequencing and steering information distribution that is capable of arbitrary control flow on a fraction superconducting qubit coherence times. Both readout and control platforms make extensive use of FPGAs to enable tailored qubit control systems in a reconfigurable fabric suitable for iterative development.