Hi all,
We'll have group meeting tomorrow (Friday) morning at 10 AM, with talks
from Xiao Yuan and Sam McArdle from Oxford. We'll be in Davenport East in
Toronto and the Division Room at Harvard. See below for titles and
abstracts :)
All the best,
Ian
-----------------
Title: Variational quantum simulation of imaginary time evolution
Speaker: Xiao Yuan
Imaginary time evolution is a powerful tool for studying quantum systems.
While it is simple to simulate with a classical computer, the time and
memory requirements scale exponentially with the system size. Conversely,
quantum computers can efficiently simulate quantum systems, but not
non-unitary imaginary time evolution. We propose a hybrid, variational
algorithm for simulating imaginary time evolution on a quantum computer. We
use this algorithm to find the ground state energy of many-particle
systems; specifically molecular Hydrogen and Lithium Hydride, finding the
ground state with high probability. Our method can also be applied to
general optimisation problems and quantum machine learning. As our
algorithm is hybrid, suitable for error mitigation, and can exploit shallow
quantum circuits, it can be implemented with current quantum computers.
Title: Error mitigation and quantum chemistry
Speaker: Sam McArdle
Variational algorithms may enable classically intractable simulations on
near-future quantum computers. However, their potential is limited by
hardware errors. It is therefore crucial to develop efficient ways to
mitigate these errors. Here, we propose a stabiliser-based method which
enables the detection of up to 60 - 80 % of depolarising errors. Our method
can easily be implemented on current quantum hardware. Numerical
simulations show that our method can significantly increase the accuracy of
noisy calculations, especially when combined with existing error mitigation
techniques.
Show replies by date