113 citations · 971 across the 28 of their papers we have counts for
28 papers
Unbalanced gain and loss in a quantum photonic system
C. A. Downing, O. I. R. Fox
Theories in physics can provide a kind of map of the physical system under investigation, showing all of the possible types of behavior which may occur. Certain points on the map a…
Parametrically driving a quantum oscillator into exceptionality
C. A. Downing, A. Vidiella-Barranco
The mathematical objects employed in physical theories do not always behave well. Einstein's theory of space and time allows for spacetime singularities and Van Hove singularities…
Resonance fluorescence of two asymmetrically pumped and coupled two-level systems
C. A. Downing, E. del Valle, A. I. Fernández-Domínguez
We study a driven-dissipative duo of two-level systems in an open quantum systems approach, modelling a pair of atoms or (more generally) meta-atoms. Allowing for complex-valued co…
Directionality between driven-dissipative resonators
C. A. Downing, T. J. Sturges
The notion of nonreciprocity, in essence when going forwards is different from going backwards, emerges in all branches of physics from cosmology to electromagnetism. Intriguingly,…
Quantum topology in the ultrastrong coupling regime
C. A. Downing, A. J. Toghill
The coupling between two or more objects can generally be categorized as strong or weak. In cavity quantum electrodynamics for example, when the coupling strength is larger than th…
Exceptional points in oligomer chains
C. A. Downing, V. A. Saroka
Symmetry underpins our understanding of physical law. Open systems, those in contact with their environment, can provide a platform to explore parity-time symmetry. While classical…