Accelerating Experiments for Advanced and Coherent Control of Spin-Qubits

The transition into the Noisy Intermediate-Scale Quantum (NISQ) era requires a significant number of logical qubits, which has led to experimental overheads becoming one of the major hurdles in quantum technologies. Qblox's comprehensive architecture addresses this issue by effectively integrating FPGA-based real-time programming, scalable feedback, and active reset protocols. This integration significantly reduces the substantial overheads typically associated with software-controlled loops. One of the key accomplishments of this architecture lies in the ability to shuttle a single charge through an electrostatically defined 1-D channel, achieved by a serial quantum dots array. This transport relies on coherent control of gates and energy levels, effectively modulating the potential landscape to create a path for charges to advance. The proprietary SYNQ protocol in Qblox's Cluster, coupled with our sequencer's real-time precision of 1 ns timegrid, allows such advanced and coherent gate control with minimal jitter of a few picoseconds. Qblox's hardware architecture also enables the combination of AWG+DC signals on a single output channel and hence, omits the bias-tees from the experimental setup. To meet stringent requirements on individual signal generation paths, a pre-distortion correction mechanism is implemented. Open software layers, Q1ASM assembly language and the higher-level Quantify package including spin-qubit specific library, facilitate programming experiments, focusing on electrostatically defined quantum dots, microwave-controlled spin-qubits, and RF-reflectometry-based read-out measurements spanning from DC to 18.5 GHz. Together with the FPGA based electronics, our DC signal sources with ultra-low drift values, ensure keeping the quantum dots at desired conditions for a very long time which makes the execution of even more complex spin-qubit experiments feasible.