A new mechanism for building quantum computers

Dr Daniel Klaus Burgarth

Dr Daniel Klaus Burgarth

10 October 2014

A new mechanism for building quantum computers has been proposed by an international team of scientists led by Dr Daniel Klaus Burgarth at Aberystwyth University.

Writing in the scientific journal Nature Communications, Dr Burgarth et al describe how the frequent observation of a basic building block of a quantum system, known as a qubit, could lead to the creation of far more powerful computers.

The paper, Exponential rise of dynamic complexity in quantum computing through projections is published on Friday 10 October 2014.

While the possibility of using quantum effects to develop a new type of computer has been known for over 30 years, only small “quantum computers” have been built until now.

Scientists are now engaged in a world wide effort to build large quantum computers which will be able perform some very complex computations in a very short time, tasks that would take the most powerful computers in use today many thousands of years to complete.

Dr Burgarth said: “Essentially our result is in the realm of theoretical physics, more specifically quantum computing.”

“What we show is that the act of measuring a quantum system can change its dynamics substantially, to the extent that the not-measured system is very simple while the measured one is a quantum computer.”

Besides potential practical applications, the result sheds new light on the role of measurements in quantum mechanics. While in our day-to-day life things appear independent of our observations, it is a perplexing but long known fact that this is no longer the case in the quantum world. The work of Dr Burgarth et al demonstrates this in the strongest possible way.

Dr Burgarth is a Senior Lecturer at the Institute of Mathematics, Physics and Computer Science at Aberystwyth University. Originally from Hamburg in Germany, he graduated in Physics at Freiburg University and was awarded his PhD from University College London.

As a researcher he has worked at ETH Zurich, Oxford University and Imperial College London.

His area of research is Quantum Physics and he works closely with physicists, mathematicians and computer scientists. He joined Aberystwyth University in 2011.