Kavli Warriors


by Christian Möhle

In recent days my daily walk to the coffee machine has become ever more painful as Guan would spot me and start to yell at me (with a big smile in his face): “Christian, write your blog post!”. So here I am, finally finding some time to write my first blog post ever. It won’t be about qubits or any other physics topic, but rather about our glorious football team, the Kavli Warriors. Continue reading Kavli Warriors

Three ways to enjoy yourselves at the QuTech Uitje


by Arian Stolk

CAUTION: This post will NOT contain any physics (ignoring any possible corny physics jokes)! That is right, no discussions about entanglement, (qu)-bits and/or crazy science in the coming story. It is not that I do not like to talk about these things, on the contrary. Yet, I thought it would be an interesting idea to talk about a more none-science-y aspect of QuTech. And I would like to do it using a yearly recurring event: the QuTech Uitje.

Continue reading Three ways to enjoy yourselves at the QuTech Uitje

A word from an editor emeritus and new blog team members!


With QuTech expanding from a quantum transport research group to a large institute focusing on quantum computers, the number of people walking around in the hallways expands. It makes you almost forget that there are also people leaving. But as the seasons go by, PhD students at QuTech come and go. It gives QuTech its characteristic dynamic character. But it also brings sadness every time we have to wave someone goodbye. And this is exactly what this blogpost is about. Since editorial duties for this blog are performed on a volunteer basis by PhD students (in what little remains of their free time), this means that any editor’s tenure is inherently limited by his or her PhD track. Therefore, with some sadness, we have to say goodbye to Jonas, the founding father of the QuTech blog and involved from the very start. He finished his PhD and moved to Amsterdam. He was an amazing and creative member of the team and we would like to thank him for the time he has spent making this blog an inspirational place for quantum computing.

But of course he wouldn’t leave without equally capable replacement. And, since QuTech is growing, we also extended the editorial team. That is why we proudly announce the two newest team members, Tim and Matteo. Actually Tim and Matteo have been active on the blog for a while. So the time is definitely there for a more official introduction. Continue reading A word from an editor emeritus and new blog team members!

Diary of an international student at QuTech


by David Maier

QuTech not only offers a wide range of interesting research, but also a diverse group of employees from numerous countries around the world. As a student from the far away country of Germany I was very curious if I would be able to fit in and overcome the cultural differences. Four months ago I came to Delft for my master’s project. In this little piece I would like to tell you from a humorous perspective about some of the challenges I faced as an international student coming to Delft and how you can overcome them too.

Disclaimer: this text contains irony.
Continue reading Diary of an international student at QuTech

European affairs


by Barbara Terhal

Recently I had to deal with some bureaucratic business involving a European grant. It concerned the transfer of this grant from one academic institution to another in the form of an amendment.
The transfer had to take place through the interaction of a variety of people, project managers, scientists, upper- and lower-level secretaries, in a EU web portal.
The portal is somewhat like a virtual castle in which one occasionally discovers a door to a hidden room. Once open, the hidden room turns out to give access to new functions and role play, inviting to dress-up and bal masqué, going far beyond the promise of the

Continue reading European affairs

Once upon a time in the Netherlands …


by Freeke Heijman

Usually this blog is about research topics. When I was asked to write an item on the political aspects of quantum, I was excited but also a bit hesitant: would this parallel universe, in which politicians, executives and government officials rule the world, be interesting to the research community? What could I share without breaking rules of confidentiality while keeping some of the juicy details that make life interesting? How could I bridge the gap between these two worlds that are so completely different in their values, methods and people?

I decided to take up the challenge. After all, these dilemmas are the very same ones people with two legs in two different communities have to deal with every day. It is about making an effort to understand and find your way in different cultures and trying to get across some glimpse of these worlds to the people you work with on both ends. The last part almost feels like a mission impossible to me – the more reason to give it a shot in this blog! Continue reading Once upon a time in the Netherlands …

QuTech interview: Prof. Wolfgang Tittel


It is a cold Monday afternoon when we have our appointment with Wolfgang Tittel, professor in physics and specialized in photon entanglement, quantum teleportation, and quantum memory. As we expect from a busy professor, he is still in another meeting when we arrive, so we decide to wait two meters outside his door. When we go and check if he’s almost done with this other meeting, his office suddenly appears deserted. In a vivid demonstration of his expertise, he seems to have teleported away from his office…

Luckily, he reappears quickly and lets us into his spacious office. One wall is completely covered by a large whiteboard, covered in scribbled equations and diagrams. Clear signs of occupation by a physics professor.  Professor Tittel himself welcomes us with a smile, clearly relishing the opportunity to talk about his work. What follows is an interview with professor Tittel, shortened and lightly edited for clarity.

What type of research do you do?

My research lies in the framework of the quantum internet. More precisely, it is about quantum key distribution (QKD) and the creation of quantum key distribution systems over very long links. This requires quantum repeaters. To create the quantum internet, we send photons down an optical fiber, but, just as in standard telecommunication, these photons get lost at some point. In standard telecommunication, you can use amplifiers to boost the signal level, but for quantum internet this doesn’t work because of the no-cloning theorem. Instead, we can use a so-called quantum repeater.

Continue reading QuTech interview: Prof. Wolfgang Tittel

A Quantum Internet made of Diamonds


How cool is that? A Quantum Internet. Made of Diamonds.

by Matteo Pompili

We are constantly connected to Internet. With our computers, our smartphones, our cars, our fridges (mine is not, yet, but you get the idea). In its very first days, the Internet was a very rudimentary, yet revolutionary, connection between computers [1]. It enabled one computer on the network to send messages to any other computer on the network, whether it was directly connected to it (that is, with a cable) or not. Some of the computers on the network acted as routing nodes for the information, so that it could get directed toward the destination. In 1969 there were four nodes on the then-called ARPANET. By 1973 there were ten times as many. In 1981 the number of connected computers was more than 200. Last year the number of devices capable of connecting to Internet was 8.4 billion (with a b!) [2].
Computers on their own are already great, but there is a whole range of applications that, without a network infrastructure, would be inaccessible. Do you see where I am going?
Continue reading A Quantum Internet made of Diamonds

A Cloud Quantum Computer Business Plan


by Christian Dickel

Quantum computing and nuclear fusion are potential 21st century technologies based on 20th century physics and neither of them is currently market ready. But while they are sometimes bunched together as fascinating concepts that will at any time be twenty years away from being realized, some estimate the timescale for the commercialization of the quantum computer to be much shorter now. Quantum computing is currently in a hype phase: The company D-wave has already sold a few quantum annealers based on flux qubits for millions of euros. They can solve certain optimization problems, but their computational advantages are a topic of debate. Google, IBM, Intel, and Microsoft are major commercial companies investing in quantum technologies right now. Several startups such as Rigetti Computing and IonQ have been founded recently with the goal of commercializing quantum computing. A list of such companies can be found here.
Continue reading A Cloud Quantum Computer Business Plan

Science on the beach


by Jonas Helsen

A few weeks ago I found myself boarding a series of planes that would take me from the Netherlands to pretty much the furthest point reachable from this starting point that still includes dry land: Sydney, Australia. I wasn’t going there entirely of my own accord. Rather I had been invited to speak at a quantum information theory workshop called Coogee. For those knowledgeable of the Sydney region, it is indeed named after a beach and yes the conference takes place less than a stone’s throw away from said beach.

Continue reading Science on the beach