80 citations · 491 across the 28 of their papers we have counts for
18 papers · 1 filter
Operator-frame geometry of non-compact quantum systems with frame-vacuum phase transitions
Satoshi Tanaka, Gonzalo Ordonez, Masatoshi Kubota +2
We formulate the geometric structure of non-compact bosonic quantum systems in regimes where vacuum instability renders the relevant quantum states non-normalizable, causing conven…
Non-Hermitian Quantum Mechanics of Open Quantum Systems: Revisiting The One-Body Problem
Naomichi Hatano, Gonzalo Ordonez
We review analyses of open quantum systems. We show how non-Hermiticity arises in an open quantum system with an infinite environment, focusing on the one-body problem. One of the…
Weak-coupling bound states in semi-infinite topological waveguide QED
Savannah Garmon, Gonzalo Ordonez, Kenichi Noba
A striking feature of cavity quantum electrodynamics is the existence of atom-photon bound states, which typically form when the coupling between the atom and its environment are s…
Manipulating quasi-bound states in a photonic crystal with periodic impurities to store quantum information
Benjamin Rempfer, Gonzalo Ordonez
We analytically model a one-dimensional lattice with periodic impurities representing a photonic crystal from first principles. We then investigate bound states in the continuum by…
Characteristic influence of exceptional points in quantum dynamics
Savannah Garmon, Takafumi Sawada, Kenichi Noba +1
We review some recent work on the occurrence of coalescing eigenstates at exceptional points in non-Hermitian systems and their influence on physical quantities. We particularly fo…
Anomalous-order exceptional point and non-Markovian Purcell effect at threshold in one-dimensional continuum systems
Savannah Garmon, Gonzalo Ordonez, Naomichi Hatano
For a system consisting of a quantum emitter coupled near threshold (band edge) to a one-dimensional continuum with a van Hove singularity in the density of states, we demonstrate…