CWI Lectures on Quantum Computing

  • What Algorithms & Complexity
  • When 03-12-2015 from 08:45 to 17:00 (Europe/Amsterdam / UTC100)
  • Where CWI
  • Add event to calendar iCal


ATTENTION: Registration is closed

We cordially invite you to attend the 'CWI Lectures on Quantum Computing' on 3 December 2015 at Centrum Wiskunde & Informatica in Amsterdam. This day is dedicated to the launch of the QuSoft research centre for quantum software. Several internationally renowned speakers will bring you up to date on the exciting topic of quantum computing. The symposium is aimed towards a general academic public.

QuSoft is an initiative of Centrum Wiskunde & Informatica (CWI), the University of Amsterdam (UvA) and the VU University Amsterdam. It will focus on developing software and finding applications that exploit the extraordinary power of quantum computers. The new centre will be headed by Harry Buhrman, Algorithms and Complexity Group Leader at CWI and Professor of Computer Science at UvA, and Kareljan Schoutens, Professor of Theoretical Physics at UvA.

Keynote speakers:
- Prof. Gilles Brassard (Université de Montréal)
- Prof. Ronald Hanson (Delft University of Technology)
- Prof. Richard Jozsa (University of Cambridge)
- Prof. Serge Massar (Université Libre de Bruxelles)
- Prof. Mario Szegedy (Rutgers University)

Quantum Show 'Wereld in trilling'
by Huub Rutjes and Yuri van Nieuwkerk (Dutch)


09.45 - 10.15    Doors open & Coffee

10.15 - 10.30    Welcome and introduction
10.30 - 11.15    Keynote Ronald Hanson: From a loophole-free Bell test to a quantum Internet
11.15 - 12.00    Keynote Serge Massar: Certified Quantum Randomness

12.00 - 13.00    Lunch break

13.00 - 13.45    Keynote Gilles Brassard: Cryptography in a Quantum World
13.45 - 14.30    QuSoft launch

14.30 - 15.00    Champagne break

15.00 - 15.45    Keynote Mario Szegedy: The Area Law and The Nature of Quantum Entanglement
15.45 - 16.30    Keynote Richard Jozsa: Complexity in Computation and in Physics
16.30 - 16.45    Wrap-up

16.45 - 18.00    Reception


Due to high demand, the registration has been closed.


For further information and questions concerning the CWI Lectures, contact Susanne van Dam (
More information on QuSoft can be found at




Ronald Hanson
QuTech, Delft University of Technology
Title: From a loophole-free Bell test to a quantum Internet

In fall 2014 the Dutch government elected the new Delft institute QuTech as one of 4 National Icon projects. After a brief introduction to the institute and its mission, I will present our work towards the realization of a highly connected network of quantum bit registers for quantum information processing and long-distance quantum communication. Diamond spins associated with NV centers are promising building blocks for such a network as they combine a coherent optical interface (similar to that of trapped atomic qubits) [1] with a local register of robust and well-controlled nuclear spin qubits [2]. We can now exploit these features simultaneously to achieve new functionalities such as unconditional remote quantum teleportation [3].
Here we present our latest progress towards scalable quantum networks, including the first loophole-free violation of Bell’s inequalities [4]. I will discuss how the techniques developed in these experiments may enable the realization of a network of quantum bit registers for quantum computation and communication. In the long run, such networks may lead to a quantum Internet secured through device-independent protocols – reaching the ultimate physical limits of privacy [5].

[1] H. Bernien et al., Nature 497, 86 (2013).
[2] T. H. Taminiau et al., Nature Nanotechnology 9, 171 (2014).
[3] W. Pfaff et al., Science 345, 532 (2014).
[4] B. Hensen et al., Nature 526, 682 (2015).
[5] A. Ekert and R. Renner, Nature 507, 443 (2014).


Serge Massar
Title: Certified Quantum Randomness

Abstract: Randomness is a phenomena which we are confronted with all the time. Will it rain today? Will the train be on time? What present will I receive at Christmas? But are such phenomena truly random? Good randomness is essential for many applications. For instance, cryptography, the art of hiding information from malicious parties, is only as good as the source of randomness that underlies it. Quantum mechanics, the theory of microscopic phenomena, can only predict the probability of events. For instance quantum theory can only predict the probability that a radioactive nucleus will decay, not when the nucleus will decay. Does this mean that microscopic phenomena are truly random?
By studying systems of two entangled particles, it can be shown both theoretically and experimentally, that events at the microscopic scale are truly random, truly unpredictable. Beyond its philosophical implications, this result also has important potential applications. Indeed it implies that one can build random number generators that certify that they work correctly. That is, if the random number generator malfunctions in some way, if the numbers it produces cease to be random, this will automatically be detected. By extending this idea, one could also build quantum cryptographic systems and quantum computers that certify that they work correctly. We discuss the perspectives for practical implementations.

Gilles Brassard
Title: Cryptography in a Quantum World

Abstract: Although practised as an art and science for ages, cryptography had to wait until the mid-twentieth century before Claude Shannon gave it a strong mathematical foundation. However, Shannon's approach was rooted is his own information theory, itself inspired by the classical physics of Newton and Einstein. When quantum physics is taken into account, new vistas open up both for codemakers and codebreakers. Is this blessing or a curse for the protection of privacy? As we shall see, the jury is still out! No prior knowledge in cryptography or quantum physics will be assumed.
Reference: arXiv:1510.04256 [quant-ph] .

Mario Szegedy
Title: The Area Law and The Nature of Quantum Entanglement

Abstract: Unlike classical states, quantum states cannot be given qubit by qubit. When one gives a state on sub-systems A and B, one may miss a great deal of information about the state on the entire (A,B). The missing information can be measured in various ways. Of particular interest for physicists, chemists and engineers are ground states of many-particle systems. What can be said about the missing information when we know the state in question only on smaller sub-systems? The Area Law is a sweeping conjecture that upper bounds the missing information. We explain what the conjecture states, how it may or may not be helpful for computing the state on the whole system and give a glimpse into the remarkable attempts for proving it.

Richard Jozsa
DAMTP, University of Cambridge UK.
Title: Complexity in Computation and in Physics

We will begin with an introductory overview of quantum mechanical features, and their prospective significance for computation and complexity. Then we will discuss the question of the relation of NP to quantum computing and its possible significance for fundamental physics. Finally we will describe some recent results on the classical simulation of quantum computations, which suggest that the relationship between classical and quantum computing power is surprisingly rich and in fact so far, little understood.

Last updated: 1 December 2015

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