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Complexity Classification of Local Hamiltonian Problems
(IEEEIEEE Symposium on Foundations of Computer Science, 2015-10-22)
The calculation of ground-state energies of physical systems can be formalised as the k-local Hamiltonian problem, which is the natural quantum analogue of classical constraint satisfaction problems. One way of making the ...
Unbounded number of channel uses may be required to detect quantum capacity
(NPGNature Communications, 2015-03-31)
Transmitting data reliably over noisy communication channels is one of the most important applications of information theory, and is well understood for channels modelled by classical physics. However, when quantum effects ...
Stability of local quantum dissipative systems
(SpringerCommunications in Mathematical Physics, 2015-04-07)
Open quantum systems weakly coupled to the environment are modeled
by completely positive, trace preserving semigroups of linear maps. The
generators of such evolutions are called Lindbladians. In the setting of ...
The relationship between a strip Wiener--Hopf problem and a line Riemann--Hilbert problem
(OUPIMA Journal of Applied Mathematics, 2015-03-31)
In this paper, the Wiener–Hopf factorization problem is presented in a unified framework with the
Riemann–Hilbert factorization. This allows to establish the exact relationship between the two types
of factorization. In ...
Consistency of the recent ATLAS Z+E_T^miss excess in a simplified general gauge mediation model
(APSPhysical Review D, 2015-05-20)
ATLAS recently reported a 3σ excess in a leptonic-Z+E_T^miss channel. This was interpreted in the literature in a simplified general gauge mediation model containing a gluino, a Higgsino next-to-lightest supersymmetric ...
Liquid Ropes: A Geometrical Model for Thin Viscous Jet Instabilities
(APSPhysical Review Letters, 2015-04-30)
Thin, viscous fluid threads falling onto a moving belt behave in a way reminiscent of a sewing machine, generating a rich variety of periodic stitchlike patterns including meanders, W patterns, alternating loops, and ...
Rapid mixing renders quantum dissipative systems stable
(APSPhysical Review A, 2015-04-09)
The physics of many materials is modeled by quantum many-body systems with local interactions.
If the model of the system is sensitive to noise from the environment, or small perturbations to the
original interactions, ...
The structure and stability of vortices in astrophysical discs
(University of CambridgeDepartment of Applied Mathematics and Theoretical Physics, 2015-10-06)
This thesis finds that vortex instabilities are not necessarily a barrier to their potential as
sites for planetesimal formation.
It is challenging to build planetesimals from dust within the lifetime of a protoplanetary
disc ...
Discrete gravitational approaches to cosmology
(University of CambridgeDepartment of Applied Mathematics and Theoretical PhysicsTrinity College, 2015-06-30)
Exact solutions to the Einstein field equations are notoriously difficult to find. Most known solutions describe systems with unrealistically high degrees of symmetry. A notable example is the FLRW metric underlying ...
On the meaning of mixing efficiency for buoyancy driven mixing in stratified turbulent flows
(Cambridge University PressJournal of Fluid Mechanics, 2015-09-17)
The concept of a mixing efficiency is widely used to relate the amount of irreversible diabatic mixing in a stratified flow to the amount of energy available to support mixing. This common measure of mixing in a flow is ...