Quantum System Hub

The Zurich Instruments QHub enables scalable quantum processor control through automated synchronization and low-latency communication between all components of a Quantum Computing Control System (QCCS). It provides high-level software access to powerful real-time capabilities designed for the most pervasive use cases in quantum computing.

With 56 ZSync ports, the QHub supports systems with up to 448 microwave channels for precisely timed and stable gate and readout operations. Central data processing enables feedback methods that require global information of the system state, e.g. for quantum error correction, with a latency down to 550 ns including all signal processing.

Decoding algorithms can be efficiently implemented on a powerful FPGA core using a ready processing infrastructure accessible in Python. Optional direct programming of the FPGA provides the flexibility required in developing novel decoder algorithms.

Proven system scalability

Up to 56 instruments can be synchronized through a QHub, leading to coordinated readout and control of up to 300 fixed frequency qubits using only SHFQCs, or up to 200 tunable-frequency qubits. New instruments can be added by plugging one cable without rework of the existing system.

Simplified feedback programming

The QCCS comes with the LabOne Q software interface that lets users control feedback operations on the system level. LabOne Q translates a user’s high-level sequence into real-time instructions for all components of the QCCS so they can operate in sync, with QHub at the center. A Python API gives users the full flexibility to integrate QHub into their own software.

High-fidelity feedback operations

Due to the star topology of the QCCS architecture, QHub is able to evaluate the global state of all the qubits that it controls. This enables feedback methods that require global knowledge of the system state, such as Quantum Error Correction. The low-latency global feedback is complemented with local feedback operations inside the SHFQC Qubit Controller with further reduced latency. The powerful FPGA core of QHub enables the user to create advanced closed-loop feedback algorithms, while achieving a low and deterministic latency.

Reliable synchronization

The ZSync interface distributes all clocks and timing signals needed to synchronize the system. Automated calibration procedures make the synchronization stable across reboots and changing environmental conditions. You can count on weeks of operation without the need for delay calibration.

QHub is compatible with any combination of HDAWG, SHFQC, SHFSG or SHFQA. It is not compatible with the UHFQA. For combinations of HDAWG and UHFQA, it is recommended to use the PQSC for synchronization and feedback.