Juq-703-uc (Browser ULTIMATE)

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2.2 Cryogenic CMOS Control (CMOS‑Q)

A pioneering aspect of the JUQ‑703‑UC is the on‑chip cryogenic CMOS control plane that operates at 4 K. This reduces latency, lowers the thermal load on the dilution stage, and permits real‑time error‑correction cycles at 10 µs intervals. Additionally, what kind of information are you looking for

3.3 Cryogenic System

| Subsystem | Specification | |-----------|----------------| | Base temperature | 10 mK (±0.2 mK) | | Cooling power @ 100 mK | 5 W | | Heat‑load budget | 1.2 W (qubit chip), 0.8 W (control lines) | | Vibration isolation | Dual‑stage mechanical suspensions + active piezo‑feedback | | Magnetic shielding | Three‑layer mu‑metal + superconducting lead shield (≤ 10 nT) | Search for publicly available information : I can

The refrigerator is modular: the QPU chip is mounted on a cryogenic “cold‑plate” that can be swapped without warming the entire system—a first in commercial quantum hardware.

5.2 Toolchain Integration

  • OpenQASM 3 → JUQ‑Transpiler → Pulse‑Level Scheduler → FPGA Firmware.
  • Hybrid‑Mode includes a Gaussian‑Boson Sampling (GBS) emulator that leverages the |2⟩–|3⟩ ladder, delivering 10⁴‑scale photon‑number simulations.
  • JUQ‑Sim (classical emulator) is provided for developers lacking physical access; it mirrors the exact noise model derived from hardware telemetry.

3. Development History

| Year | Milestone | |------|-----------| | 2022 | Initiation of the EU‑JUQ7 consortium (funded under Horizon Europe) with partners QAT, CERN‑Q, Delft Quantum Lab, and IBM‑Q. | | 2023 | First successful 3‑D transmon prototype (4 × 4 array) demonstrating 99.99 % gate fidelity. | | 2024 | Demonstration of cryogenic CMOS‑Q readout chain; integration of 64 × 64 qubit tile. | | 2025 Q3 | Public reveal of the JUQ‑703‑UC design at the Quantum Frontiers 2025 conference in Zurich. | | 2025 Q4 | Completion of a full‑system testbed (131 k physical qubits) achieving a logical error rate of 1 × 10⁻⁹ per gate. | | 2026 Q1 | Commencement of limited‑beta shipments to the European Quantum Computing Initiative (EQCI) and selected industry partners. | | 2026 Q3 | First production‑grade units delivered to the National Supercomputing Center (NSC) – Frankfurt. |

The project’s rapid progress hinged on three technical breakthroughs:

  1. Epitaxial Al‑on‑Si growth that eliminated two‑level system (TLS) loss.
  2. CMOS‑Q process node co‑developed with GlobalFoundries, enabling 5 nm gate transistors that operate reliably at 4 K.
  3. Miniaturized dilution refrigeration, a collaboration with BlueFors that cut the size of the 10 mK stage by 80 %.

Development and Integration Workflow

  1. Hardware Setup – Mount the JUQ‑703‑UC onto a standard 2.54 mm pitch prototyping board or use the supplied DIN‑rail enclosure. Connect power, I/O, and communication cables according to the pin‑out diagram (included in the datasheet).
  2. Software Environment – Install the JUQ‑IDE (free, Windows/Linux/macOS) which bundles the GCC toolchain, JTAG/SWD drivers, and a library of peripheral drivers.
  3. Bootloader & Firmware – Flash the secure bootloader via the built‑in USB‑C boot port. Use the provided “Hello‑World” template to verify communication (UART echo) and basic GPIO toggling.
  4. Peripheral Configuration – Enable ADC channels in the juq_config.h file, set sampling rates, and map each channel to a logical sensor name.
  5. Real‑Time Tasks – Create FreeRTOS tasks for each functional block (e.g., Task_MotorControl, Task_SensorAcq, Task_NetComm). Assign appropriate priorities to guarantee deterministic behavior.
  6. Testing & Validation – Run the built‑in self‑test (BST) routine, which checks clock accuracy, I/O integrity, and communication link quality.
  7. Deployment – Package the unit in the optional IP67 housing, attach the PoE injector for power‑over‑Ethernet installations, and schedule OTA updates via the secure boot protocol.

3.2 Connectivity & Coupling

  • Nearest‑neighbour (NN) couplers: Fixed capacitive couplers (≈ 10 MHz exchange rate).
  • Long‑range tunable couplers: Microwave resonators with flux‑biased SQUIDs, providing on‑demand coupling up to 50 MHz across a distance of 2 cm on the chip.
  • Cross‑talk mitigation: Dedicated “ground‑plane fences” and active cancellation tones driven by the control FPGA.

Key specifications (typical / expected)

  • Form factor: compact wall-mount / small rack tray
  • Topology: line-interactive UPS with automatic voltage regulation (AVR)
  • Output power: ~300–750 VA (models vary; JUQ-703-UC suggests mid-range ~700 VA)
  • Output waveform: simulated (stepped) sine or modified sine wave
  • Runtime at half load: ~10–20 minutes
  • Input voltage range: 100–240 VAC auto-sensing
  • Frequency: 50/60 Hz auto-select
  • Battery type: sealed lead-acid (SLA) or maintenance-free VRLA
  • Recharge time: 4–8 hours to 90%
  • Outlets: 3–6 IEC or NEMA outlets (some protected, some surge-only)
  • Communication: USB (and possibly RS-232) for shutdown/monitoring
  • Indicators: LED status, audible alarm
  • Protections: surge suppression, short-circuit, overload protection