Calendar

Previous Seminars & Events: 

Typically, meetings are on Fridays and start at 12:30 in the colloquium room (00.832) of the Department of Biophysics (Huygens Building, Radboud University), unless listed otherwise.

Schedule is due to changes—you might want to follow us on Twitter to be alerted when such a change occurs.

You may also be interested in the ICIS AI-group colloquia at the computer-science department, typically friday afternoon.

ICIS calendar

For more information about the seminars please contact Wim Wiegerinck at

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Seminar: Roeland Wiersema

Roeland will give a talk on Quantum Variational Eigensolvers. The time has been changed to accommodate for the christmas choir repetitions. This is a good opportunity to get in some background knowledge for the Quantum Machine Learning colloquium on December 13

H00.832 (the seminar room of wing 8)

Fri, 1-Nov-2019 12:00-13:00

SNN Reading Club

We will discuss the paper by Google claiming quantum supremacy, which can be found here: https://www.nature.com/articles/s41586-019-1666-5

H00832

Fri, 8-Nov-2019 11:30-12:30

SNN Seminar Joris Kattemölle




Title: No superdecoherence in continuous baths
Abstract:

Decoherence forms the main obstacle to quantum computation. Typically, the decoherence rate per qubit is constant. In a physical model of decoherence*, where the qubits couple collectively to the environment, it was shown that some states show a worse kind of system size dependence. For these states the decoherence rate per qubit increases linearly with the number of qubits. This effect is called superdecoherence, and poses a serious threat to the scalability of quantum computation. However, we show that superdecoherence does not exist when the spectrum of the environment is continuous (rather then discrete). The reason is that, as the number of qubits is increased, a quantum register inevitably becomes susceptible to an ever narrower bandwidth of frequencies. What is more, even when the environment has a discrete spectrum, one of the frequencies has to coincide exactly with the frequency the quantum register is most susceptible to. Therefore superdecoherence is only exhibited in special cases that may easily be avoided.


*(See the section `an exactly solvable model' in Breuer and Petruccione)

H00832

Fri, 22-Nov-2019 11:30-13:00