
QUANTUM DYNAMICS AND NONLINEAR DYNAMICS 

We are investigating the behaviour of quantum systems which are promising
candidates for the development of future quantum technologies, such as
quantum computers and quantum sensors. These include the theoretical
investigation of how quantum spins qubits interact with the surrounding
environment which causes the qubit to lose its quantum coherence. Often the
environment can be itself a collection of other quantum spins and decoherence
by a quantum bath can be rather different from decoherence by classical
noise. One example are hybrid spin electronicnuclear qubits where we have
shown theoretically that the coherence times can vary by orders of magnitude
at certain optimal working points. We are part of the UCL quantum
information group and collaborate with experimental groups at the London
Centre for Nanotechnology. We are also investigating the theory of
optomechanical cooling of small mechanical resonators into the quantum ground
state, in particular of small silica spheres and nanodiamonds levitated in
optical fields. This project is a collaboration with the optomechanics
group currently implementing experimental realisations of levitated systems .
(1) Optomechanics: towards sensing at the quantum limit (2) Quantum spin dynamics: suppressing decoherence by quantum spin baths
