The Qubit Readout and Control (QRC) module is built on advanced RFSoC technology, providing a continuous frequency range from 100 MHz to 10 GHz for the generation of all readout and control signals.
A high channel density RF solution built on a unique DDS and single mixing combination, ensuring accurate operation across the full frequency range without recalibration. Each channel provides >800 MHz instantaneous bandwidth across the entire frequency span, supporting frequency‑multiplexed readout (12 frequencies). Short rise times and low ringing deliver strong time-domain performance, while an excellent signal-to-noise ratio and low phase noise enable high-fidelity gates.
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Combining the best of direct digital synthesis (DDS) and analog mixing technology, the Quantum Readout and Control (QRC) module represents a groundbreaking advancement in quantum control. By leveraging the high-frequency capabilities of DDS, the QRC eliminates the need for a second mixing stage as compared to the double super heterodyne technique (DSH), preserving the calibration-free advantage of DSH while reducing phase noise.
The QRC module ensures channel-independent frequency range coverage without gaps, providing maximum user flexibility. With its design, users can effortlessly select a primary operating frequency. The hardware will then automatically adjust the settings to provide the full bandwidth immediately available around the chosen center frequency.
The Qubit Readout and Control Module (QRC) operates within the Qblox Cluster mainframe, offering seamless integration and scalability. A single 19” rack Cluster unit can accommodate up to 20 QCM modules, providing density for up to 80 baseband channels.
Qblox’s modular architecture allows interoperability between the QRC and other modules, including the Qubit Control Modules (QCM and QCM-RF II), Qubit Readout Modules (QRM and QRM‑RF), and the Qubit Timetag Module (QTM). Using the proprietary SYNQ and LINQ interconnect protocols, all modules communicate and run synchronously. This architecture ensures precise alignment of control, readout, and processing, allowing users to configure a control stack that matches their quantum system and supports high‑fidelity operation.
SYNQ protocol guarantees synchronization of all channels, with ps-level jitter and great phase coherence for precise qubit control and the highest fidelities.
LINQ protocol provides fast, scalable feedback with all-to-all connectivity for conditional playback and conditional branching.
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