Demonstration of Quantum State Teleportation Using the QubiC Distributed Processor

Implementing quantum circuits utilizing mid-circuit measurement with feedforward logic requires flexible, low-latency classical control. We have developed a custom FPGA-based processor for QubiC, an open source platform for superconducting qubit control. The processor has a distributed architecture consisting of a bank of lightweight cores, each configured to control a small (1-3) number of signal generator channels. Each core is capable of executing parameterized control and readout pulses, as well as performing arbitrary control flow based on mid-circuit measurement results. We have also developed a modular compiler stack and domain-specific high level representation for programming the processor. Our representation allows users to specify circuits using both gate and pulse-level abstractions, and includes high-level control flow constructs (e.g. as if-else blocks and loops). The compiler stack also supports standard quantum software tools and programming languages, such as TrueQ, pyGSTi, and OpenQASM3. In this presentation, we will detail the design of both the processor and compiler stack, and demonstrate its capabilities with a simple quantum state teleportation experiment using transmon qubits at the LBNL Advanced Quantum Testbed.