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Business, Newsblog, Science
Interview with Daan Kuitenbrouwer from Delft Circuits
23 November 2021 ByJesse van Welzenes
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Reinventing the cable

Although quantum computing sounds very comparable to ‘normal’ computing, it almost requires us to reinvent the wheel. Every normal component you may know in a normal computer needs to be redesigned to serve a purpose in quantum systems. The cabling and processing of signals for quantum and ultracold systems is no exception. We meet Daan Kuitenbrouwer from Delft Circuits as they know a thing or two about cables. Or preferably, Cri/oFlex®.

Why is there a need for a new type of cable in the quantum industry? To make qubits in a quantum system work, we need to go to extremely low temperatures. Another word you may have heard for these ultracold systems is cryogenic systems. And working in this domain is not like making a cable that also works in your freezer. The cables that Delft Circuits produce do their job at a temperature that is ~270° lower than the freezing point of water. And hence the name of the product Cri/oFlex® – Cryogenic i/o which is flexible!

But there are more reasons to design a new type of cable. Traditionally, Coax-cables were used in quantum systems. These cables you may know from bringing in your TV signal. “Coax-cables work with several circular layers through which signals can be sent. This works well for high-frequency signals, which we also use in quantum systems. The only thing is that you need a multitude of cables, and this makes it not very scalable. For example, if you want to use components to amplify or weaken a signal, this cannot be integrated into the cable.”

These issues are solved by using another type of cable. “We do not work with coaxial cables but with striplines. And this has several advantages. First, the size of the cable is a lot smaller. You can also use multiple cables next to each other. This means that we can use a multitude of channels per cable. Also, we can integrate components in the cable, like the filters named before. This combined makes these cables more scalable, and this can be applied in quantum systems.”

Julia Lekanne dit Deprez (Instrument maker, Delft Circuits) at the Delft Circuits lab.

So, we thought, all the quantum systems need cables and a lot of them. And we asked ourselves how we can wire qubits in a different way than with coax-cables, which were designed for the telecom industry and not for the quantum industry.

-Daan Kuitenbrouwer, COO & Founder at Delft Circuits.

For the future, the scope of Delft Circuits is wider than just cabling. “We want to be a player who manufactures and designs i/o application for a wide range of quantum systems and cryogenic systems. With i/o application, we do not only mean cables but also interfaces and components, all necessary to successfully connect components of quantum systems. Our goal is to learn a lot about cryogenic applications to help as many parties as we can. And the more parties we help, the further our systems improve.”

The journey to work on the cables that Delft Circuit now produces already started some years ago. “I’m always confused if we started at 17 or 18 May 2017, so to be careful, we started in May 2017.” As Daan was studying the field of Fluid Mechanics, he met Sal via a mutual friend in Delft. Sal is the other founder of Delft Circuits. Daan always had the idea of starting a business and the quantum industry was a new field in which a lot more room was present for new projects.

Sal already had a great idea for a business in the field of quantum and he had a company where Daan started as an intern. And as time progressed, this internship grew to the business that Delft Circuits now is. But without the third person, Paulianne Brouwer, Delft Circuits wouldn’t be the company that it is today. She is the commercial brain behind the company. She broadened the view of Daan and Sal, and made it clear that there also is an important commercial aspect to designing a contribution for the quantum industry.

As this founding story contains an element of coincidence, it is not the only element that makes Delft Circuits the grown-up company with 25 employees that it is today. The idea to start on i/o applications and cables is a carefully crafted strategy.

“The idea comes from looking at the value chain in a developing industry. In the beginning, there are parties who build an entire system. At a certain point, all the sub-components need to meet higher demands and more components are being introduced. At a certain point, an industry emerges from parties who supply individual components, which was the case in 2015/2016. So, we thought, all the quantum systems need cables and a lot of them. And we asked ourselves how we can wire qubits in a different way than with coax-cables, which were designed for the telecom industry and not for the quantum industry,” says Daan.

And as we now have progressed for some years, the quantum industry does need cables, a lot of them. The team at Delft Circuits works hard in the lab, but they also make time to celebrate real ‘eureka’-moments. And as more cables are needed, more ‘eureka’-celebrations will come.

📷 Photos by Rebekka Mell, taken at TNO’s Quantum Information Technology Testing facility (QITT), which is an open testing facility that meets the specific market need for an independent, confidential, proprietary test laboratory.

Related articles

Postdoctoral Researcher in Quantum Algorithms and Optimization

We offer a two-year postdoctoral position as part of a joint research project between QuSoft and TOYOTA, that is exploring the possibilities of quantum computing in research and development use cases, in particular quantum optimization as part of machine learning workflows.

You will be employed at the Institute for Informatics (IvI) at the University of Amsterdam (UvA), and you will be a member of QuSoft, the Dutch research institute for quantum software.

What are you going to do
The project is a scientific exploration of the possibilities of speeding up the solving of optimization problems, especially those related to primitives in machine learning. This will be done in collaboration with domain experts from TOYOTA, who will contribute real-world use cases and data. Your research will encompass several aspects of this question, and will encompass:

  • study the computational problems arising within real-world machine learning work-flows, matching them with possible quantum optimization algorithms;
  • adapt these quantum algorithms for the specific use-cases, and develop new quan-tum algorithms for these tasks;
  • implement proof-of-concept versions of quantum optimization algorithms on real-world data and analyze their accuracy and performance;
  • write, publish, and present scientific papers disseminating your results.

The project will be supervised by:

  • dr. Sachin Kinge for TOYOTA
  • dr. Florian Speelman and prof. dr. Harry Buhrman for QuSoft, UvA

What do we require from you

    • a completed PhD in quantum algorithms, or a closely related topic;
    • strong motivation to work in a cross-disciplinary environment at the interface of academic and corporate research;
    • fluency in oral and written English and good presentation skills.

Our offer to you

A temporary employment contract for 38 hours per week for a period of 24 months. Starting as soon as possible.

The gross monthly salary, based on 38 hours per week and dependent on relevant experience, ranges between € 2,846 to € 4,490 (scale 10). This is supplemented by 8% holiday allowance and 8,3% end-of-year allowance. A favourable tax agreement, the ‘30% ruling’, may apply to non-Dutch applicants. The Collective Labour Agreement of Dutch Universities is applicable.

Besides the salary and a vibrant and challenging environment at Science Park we offer you multiple fringe benefits, check for the benefits here.

Do you have any questions about this vacancy?

Or do you want to know more about our organization? Please contact: Dr. Florian Speelman

Applications should include the following information (all files besides your CV should be submitted in one single pdf file):

  • a cover letter in which you present yourself briefly;
  • a personal statement describing your general research interests, past research and research plans;
  • a detailed CV including the months (not just years) when referring to your education and work experience;
  • a list of publications;
  • the names and email addresses of three referees who can provide letters of recommendation (please do not include any reference letters in your application).

Interested? Apply here.

By Vania López Díaz 17 November 2022
0 Comments/in Jobs /
https://quantumdelta.nl/TUQ/wp-content/uploads/2022/09/neutraal-quantum-beeld-1.jpeg 215 360 Vania López Díaz https://quantumdelta.nl/TUQ/wp-content/uploads/2020/03/QDNL_LOGO_RGB_HOR.svg Vania López Díaz2022-11-17 16:04:352022-11-17 16:09:42Postdoctoral Researcher in Quantum Algorithms and Optimization

House of Quantum and TNO sign collaboration agreement for shared quantum test facility

During the annual event for the entire Quantum Delta NL community, which took place in Rotterdam this month, House of Quantum (HoQ) and TNO signed a collaboration agreement for the development of a shared Quantum Technology (QT) test facility. This facility will be realized at the House of Quantum ‘Elektronicaweg’, in Delft.

Read more
By Juliette de la Rie 29 September 2022
0 Comments/in blog, Newsblog, QDNL news /
https://quantumdelta.nl/TUQ/wp-content/uploads/2022/09/HoQ-TNO2-scaled.jpg 1704 2560 Juliette de la Rie https://quantumdelta.nl/TUQ/wp-content/uploads/2020/03/QDNL_LOGO_RGB_HOR.svg Juliette de la Rie2022-09-29 07:32:312022-09-29 07:32:31House of Quantum and TNO sign collaboration agreement for shared quantum test facility

Winnaars eerste Quantum Delta NL MKB-call bekendgemaakt

Read more
By Juliette de la Rie 15 September 2022
0 Comments/in blog, Newsblog, QDNL news /
https://quantumdelta.nl/TUQ/wp-content/uploads/2022/09/DSC_3022-scaled.jpg 1703 2560 Juliette de la Rie https://quantumdelta.nl/TUQ/wp-content/uploads/2020/03/QDNL_LOGO_RGB_HOR.svg Juliette de la Rie2022-09-15 09:05:182022-09-16 09:21:58Winnaars eerste Quantum Delta NL MKB-call bekendgemaakt

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