Qubit Control RF Module | QCM-RF II

MAINFRAME COMPATIBLITY
Cluster
IN OUT:
2 Analog output
2 Digital output

The Qubit Control RF Module (QCM-RF II) is the ideal RF signal generator specifically designed for qubit control within the 2 - 18.5 GHz frequency range.

High-precision pulses are generated in real-time by the combination of an on-board waveform engine and a real-time sequence processor. Together, they utilize 16k wave memory to support advanced pulse envelopes, including Gaussian and DRAG shapes, as well as shaping the outputs by amplitude, offset, modulation frequency, and phase. Defined on a 1 ns time grid, I and Q pulses can be updated at nanosecond resolution. The pulses are upconverted to the RF domain via the integrated local oscillator and IQ mixers with ultra‑low noise and high stability, enabling high‑fidelity microwave control of qubits.

Explore Product details
Frequency icon
FREQUENCY:
2 - 18.5 GHz
SEQUENCE PROCESSORS:
6

QCM - RF key highlights

Frequency icon
Operation across the 2 – 18.5 GHz band provides flexible frequency coverage supporting a wide range of experimental configurations.
Six integrated sequencers across with all-to-all connection enable simultaneous control of up to six frequencies for time and frequency multiplexing.
Waveform real-time parameterization of amplitude and gain enables fast scanning and pulse shaping, while dynamic phase and frequency modulation support virtual Z-gates.
Real-time output switch control enables dynamic signal routing and provides an additional −60 dB attenuation stage for improved signal isolation.
Integrated mixer calibration technology simplifies the IQ mixer setup and ensures optimal modulation performance.
Built-in programmable attenuation enables precise output power adjustment, simplifying setup and improving experimental repeatability.
High-resolution 1 ns timing combined with fast rise times and low ringing ensures high-fidelity pulse delivery for precise X/Y gate operations.

Using the QCM-RF in the Qblox Cluster

Scalable QCM-RF II Cluster Integration

The Qubit Control RF Module (QCM‑RF II) operates within the Qblox Cluster mainframe, ensuring straightforward integration and scalability. With 2 analog and 2 digital outputs per module, a 19” rack Cluster unit can accommodate up to 20 QCM‑RF II modules, delivering a total of 40 output channels for high-fidelity qubit control.

Seamless Cross-Module Integration

Qblox’s modular architecture allows interoperability between the QCM-RF II and other modules, including the Qubit Control Module (QCM), Qubit Readout Modules (QRM and QRM‑RF), Qubit Readout and Control (QRC), and the Qubit Timetag Module (QTM).

Using the proprietary SYNQ and LINQ interconnect protocols, all modules communicate and run in synchrony. 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.

Explore more products

Cluster
Modular Quantum Control
DC Cluster
Ultra Stable DC
QSM
DC Channel
QCM
0 - 400 MHz
QRM
0 - 400 MHz
QRC
100 MHz - 10 GHz
QCM-RF II
2 - 18.5 GHz
QRM-RF
2 - 18.5 GHz
QTM
Digital I/O
Qblox Scheduler
Software

Trusted by the teams building the
quantum future.

“ As we build integrated multimodal quantum data centers and connect quantum processors directly with HPC infrastructures, transparent, low-level hardware control is essential to delivering scalable, hybrid quantum–classical computing environments. Qblox enables this level of hardware control through Q1ASM, giving us at Qilimanjaro the precision and flexibility needed to advance our analog and digital QPUs."

Marta P. Estarellas
CEO

“ Since 2021, Qblox has been a vitalpartner in our mission to build a 100-qubitquantum computer for Swedish industry.Their robust, scalable control systemdelivers outstanding analog performance,allowing us to push quantum boundarieswithout hardware limitations. Withunparalleled channel synchronizationand fast real-time feedback, we can fullytune up our 20-qubit systems in under 30minutes."

Giovanna Sammarco Tancredi
Senior Researcher Chalmers

“Since 2022, Qblox has been a trustworthy partner, providing the qubit-agnostic control electronics essential to our vision. Their Cluster’s SYNQ & LINQ protocols enabled the ultra-low latency required for our fast, parallel qubit characterization. We highly recommend Qblox for their professionalism and innovative approach to quantum computing challenges.'

Vishal Chatrath
CEO

“ The Qblox control stack has transformed our lab by replacing four separate pieces of equipment with a single, integrated 'blue box'. By combining RF/MW generation with coincidence detection and timetagging, our students achieve results faster. Combined with their excellent, fast-response support, Qblox is essential for our state-of-the-art research."

Ronald Hanson
Professor

“ Qblox support team’s expertise and quick response to our queries exceeded my expectations, making the setup process a breeze. Their continuous support allows our PhDs and postdocs to excel in their measurements without worrying about the control electronics. I’m very impressed by Qblox’s commitment to supporting their products and their users."

picture of Halima Giovanna Ahmad
Dr. Halima Giovanna Ahmad
Assistant professor

“The QTM delivers state-of-the-art performance for field-deployed quantum communication. It stands out through its immediate reconfiguration via a Python API and seamless integration with the Qblox Cluster. This allows for full orchestration of quantum memories and photon sources—all within a single, unified setup."

Gustavo Castro do Amaral
Quantum Scientist

“ I've been impressed by the technical background and helpful attitude of the team we have supporting us. They are always fast to respond, really helpful and give thoughtful answers. It's fantastic."

picture of Oscar Kennedy
Oscar Kennedy
Senior Quantum Engineer

“ Qblox support team's expertise and quick response to our queries exceeded my expectations, making the setup process a breeze. Their continuous support allows our PhDs and postdocs to excel in their measurements without worrying about the control electronics. I’m very impressed by Qblox’s commitment to supporting their products and their users."

picture of Christopher Wilson
Dr. Christopher Wilson
Professor

Let’s build quantum, together!

Want to accelerate your quantum computing research and development?
BOOK A meeting
Prioritize your qubit research
High fidelity qubit control
Future ready system
solutions
IndustryResearch
Products  >
cluster series
Cluster DC Cluster
QICK
Software
Qblox Scheduler
modules
QCMQCM - RFQRMQRM - RFQRCQTMQSM
Applications  >
Superconducting QubitsSpin QubitsColor Centers
Resources  >Webinar | Quantum BuildersWhitepapersVideos Product SheetsApplication NotesFirmwares
Technical documentation
icon
Company
About usNewsroomConferences & EventsPress kit
Careers
icon
© 2026 QBLOX BV | All rights reserved
Terms & ConditionsPrivacy Policy
This is some text inside of a div block.
This is some text inside of a div block.
This is some text inside of a div block.
This is some text inside of a div block.
This is some text inside of a div block.
This is some text inside of a div block.

Cluster backplanes Intermodular protocols

The QCM-RF II module creates signals parametrized by variables such as gain, offset, NCO frequency and phase, etc., and also by waveform envelopes stored in memory.

This parametrization is controlled by the AWG paths of the Q1 sequencer, which have two waveform paths each (hereon referred to as path 0 and 1). The outputs of the AWG paths are mixed with the NCO by the onboard IQ mixers, enabling operation as modulated IQ signals. These paths, after mixing with the LO, can be connected to any output of the instrument (i.e., O1 and O2). The sequencers also control two marker output channels. The RF upconversion stage features two independent IQ mixers on board for generating the output signals in the range of 2-18.5 GHz.

Specifications

Analog output channels
4
Analog output channels
4
Analog output channels
4
Analog output channels
4
Analog output channels
4
Analog output channels
4
Analog output channels
5
Analog output channels
4
Analog output channels
4
Analog output channels
4

Using the QCM-RF II in the Qblox Cluster

The Qubit Control RF Module (QCM‑RF II) operates within the Qblox Cluster mainframe, ensuring straightforward integration and scalability. With 2 analog and 2 digital outputs per module, a 19” rack Cluster unit can accommodate up to 20 QCM‑RF II modules, delivering a total of 40 output channels for high-fidelity qubit control.

Qblox’s modular architecture allows interoperability between the QCM-RF II and other modules, including the Qubit Control Module (QCM), 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 in synchrony. 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.

Unique patented protocols to create scalable systems that function as a single unit

SYNQ protocol guarantees  < 1 ns 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 in < 400 ns, featuring all-to-all connectivity for conditional playback and conditional branching.

Let’s build quantum, together!

Want to accelerate your quantum computing research and development?
Prioritize your qubit research
High fidelity qubit control
Future ready system