PLEASE NOTE: In response to the latest public health recommendations to prevent the spread of the novel coronavirus, we are disappointed to let you know that this WIQD event is cancelled.

March 18, 2020

OBA library of Amsterdam

WIQD Symposium

CANCELED: We will be holding the First WIQD Symposium in Amsterdam on March 18, 2020. The event will feature keynote speakers Heike Riel (IBM) and Barbara Terhal (TU Delft) as well as opportunities to connect with fellow WIQD Women.

Program details

10:30Doors open, registration
11:00Welcoming Remarks: What is WIQD?
11:15Keynote: Barbara Terhal
12:15Lunch (provided) and networking
1:30Short scientific talks by
Subhasree Patro (CWI)
Anne-Marije Zwerver (QuTech)
2:20Coffee break and networking
2:50Panel Discussion
3:30Keynote: Heike Riel
4:30Drinks and networking

In addition, there will be optional speed-networking sessions during the lunch and the coffee breaks.

Registration is free, but mandatory.


OBA library of Amsterdam
143 Oosterdokskade
1011 DL Amsterdam

Panel Discussion: Women in quantum technologies

In our panel discussion, we will discuss the future of WIQD, and specifically:

What can WIQD do to help retain women in the field of quantum computing?

We want WIQD to be a network that is useful for you. In this panel discussion, we will discuss the future of WIQD, how it should take shape, and how we can work together to make a network that works for all of us.


We are grateful for the generous support of the Kavli foundation, and NWO.

Keynote talks – abstracts:

Quantum Computing, Quo Vadis

Barbara Terhal

I will give a perspective on the history and roots of the field of quantum computing. I will discuss some of the current aspirations, challenges and forward directions.

Short scientific talks – abstracts:

A Framework of Quantum Strong Exponential-Time Hypotheses

Subhasree Patro

The strong exponential-time hypothesis (SETH) is a commonly used conjecture in the field of complexity theory. It states that CNF formulas cannot be analyzed for satisfiability with a speedup over exhaustive search. This hypothesis and its variants gave rise to a fruitful field of research, fine-grained complexity, obtaining (mostly tight) lower bounds for many problems in P whose unconditional lower bounds are hard to find. In this work, we introduce a framework of Quantum Strong Exponential-Time Hypotheses, as quantum analogues to SETH.

Using the QSETH framework, we are able to translate quantum query lower bounds on black-box problems to conditional quantum time lower bounds for many problems in BQP. As an example, we illustrate the use of the QSETH by providing a conditional quantum time lower bound of n^{1.5} for the Longest Common Subsequence and Edit Distance problems. We also show that the n^2 SETH-based lower bound for a recent scheme for Proofs of Useful Work, based on the Orthogonal Vectors problem, holds for quantum computation assuming QSETH, maintaining a quadratic gap between verifier and prover.

Joint work with Prof. Harry Buhrman and Dr Florian Speelman.

Industrial quantum dot arrays for spin-qubit quantum computation by all-optical 300mm lithography

Anne-Marije Zwerver, Tobias Krähenmann, Stephanie Bojarski, Hubert George, Brennen Mueller, James Clarke, Lieven Vandersypen

On the road to building a quantum computer, spin qubits in gate-defined, silicon quantum dots stand out as promising qubit implementations. Advantages are their small size, long coherence times and compatibility with semiconductor technology. However, all quantum dot arrays fabricated to date rely on electron beam lithography for their fine gate patterns, even those processed on 300 mm process lines. Successfully integrating the many thousands of qubits that will be needed to solve real-world problems with a quantum computer, will require advanced semiconductor manufacturing, including all-optical lithography.

Here, we present the first quantum dot arrays made entirely with optical lithography in an industrial 300 mm processing line. We demonstrate well-controlled single and double quantum dots formed in an isotopically enriched 28Si-MOS substrate. In the many-electron regime independent tunnel-barrier control is shown, a prerequisite for high-fidelity two-qubit control. Using state of the art charge detection methods, we are able to observe single-electron occupation of these quantum dot arrays. The few-electron regime shows stable device behavior, with dots forming both under the plunger and barrier gates, where we analyze the occurrence of spurious dots.

Data-driven process improvements of the quantum dots have led to a significant increase in charge-sensing sensitivity, capable of single shot read-out.