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21 papers · 1 filter
Real critical exponents from the -expansion in an interacting model with non-Hermitian anisotropy
Eduard Naichuk, Jeroen van den Brink, Flavio S. Nogueira
In quantum optics and condensed matter physics non-Hermitian phenomena are often studied under the assumption of an open physical system. However, there are examples of intrinsical…
The geometry of the Hermitian matrix space and the Schrieffer--Wolff transformation
Gergő Pintér, György Frank, Dániel Varjas +1
In quantum mechanics, the Schrieffer--Wolff (SW) transformation (also called quasi-degenerate perturbation theory) is known as an approximative method to reduce the dimension of th…
Protecting Hilbert space fragmentation through quantum Zeno dynamics
Pranay Patil, Ayushi Singhania, Jad C. Halimeh
Hilbert space fragmentation is an intriguing paradigm of ergodicity breaking in interacting quantum many-body systems with applications to quantum information technology, but it is…
Environment-assisted invariance does not necessitate Born's rule for quantum measurement
Lotte Mertens, Jasper van Wezel
The argument of environment-assisted invariance (known as envariance) implying Born's rule is widely used in models for quantum measurement to reason that they must yield the corre…
Quantum state reduction of general initial states through spontaneous unitarity violation
Aritro Mukherjee, Srinivas Gotur, Jelle Aalberts +3
The inability of Schrodinger's unitary time evolution to describe measurement of a quantum state remains a central foundational problem. It was recently suggested that the unitarit…
An objective collapse model without state dependent stochasticity
Lotte Mertens, Matthijs Wesseling, Jasper van Wezel
The impossibility of describing measurement in quantum mechanics while using a quantum mechanical model for the measurement machine, remains one of its central problems. Objective…