42 citations · 44 across the 7 of their papers we have counts for
9 papers
The Many Faces of Non-invertible Symmetries
Shadi Ali Ahmad, Marc S. Klinger, Yifan Wang
We investigate the interplay between algebraic and categorical notions of non-invertible symmetries. In particular, a fusion categorical symmetry is shown to induce a…
The building blocks of asymptotically flat spacetimes
Shadi Ali Ahmad
The classification of all possible induced representations arising from theories admitting a Poincaré symmetry has molded our very conception of particles in flat space. In this no…
Extensions from within
Shadi Ali Ahmad, Marc S. Klinger
Inclusions and extensions lie at the heart of physics and mathematics. The most relevant kind of inclusion in quantum systems is that of a von Neumann subalgebra, which is the focu…
Algebraic perturbation theory: traversable wormholes and generalized entropy beyond subleading order
Shadi Ali Ahmad, Ro Jefferson
The crossed product has recently emerged as an important ingredient in describing algebras of observables for quantum field theory and gravity. We combine this with perturbation th…
Emergent Geometry from Quantum Probability
Shadi Ali Ahmad, Marc S. Klinger
Carrying the insights of conditional probability to the quantum realm is notoriously difficult due to the non-commutative nature of quantum observables. Nevertheless, conditional e…
Relational Quantum Geometry
Shadi Ali Ahmad, Wissam Chemissany, Marc S. Klinger +1
A common feature of the extended phase space of gauge theory, the crossed product of quantum theory, and quantum reference frames (QRFs) is the adjoining of degrees of freedom foll…
Quantum Reference Frames from Top-Down Crossed Products
Shadi Ali Ahmad, Wissam Chemissany, Marc S. Klinger +1
All physical observations are made relative to a reference frame, which is a system in its own right. If the system of interest admits a group symmetry, the reference frame observi…
Crossed product algebras and generalized entropy for subregions
Shadi Ali Ahmad, Ro Jefferson
An early result of algebraic quantum field theory is that the algebra of any subregion in a QFT is a von Neumann factor of type III, in which entropy cannot be well-defined bec…
Finite resolution ancilla-assisted measurements of quantum work distributions
Shadi Ali Ahmad, Alexander R. H. Smith
Work is an observable quantity associated with a process, however there is no Hermitian operator associated with its measurement. We consider an ancilla-assisted protocol measuring…