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06/10/2026, 10:15
Conformal field theory (CFT) provides a powerful framework for describing critical phenomena in quantum systems. Non-Hermitian (NH) quantum systems are governed by non-Hermitian Hamiltonians, and one of their most striking features is the emergence of exceptional points (EPs), where eigenvalues and eigenstates coalesce. This naturally raises the question: what happens when these two...
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06/10/2026, 11:30
In this talk, I am going to talk about two topics. First, I will introduce how a single PT-symmetric non-Hermitian impurity can induce exceptional points (EP) on critical Hermitian SSH models. From this, we relate the existence of EP to several physical observables that serve as evidence that the underlying structure is governed by certain non-unitary CFT. In addition, some boundary effects...
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06/10/2026, 13:20
Title: Non-Hermitian Topology in Hermitian Topological Matter
Abstract:
Non-Hermiticity gives rise to distinctive topological phenomena absent in Hermitian systems. However, connection between such intrinsic non-Hermitian topology and Hermitian topology has remained largely elusive. Here, considering the bulk and boundary as an environment and system, we demonstrate that anomalous...
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06/10/2026, 14:45
Recent studies have demonstrated that the Schrödinger equation can be realized geometrically. In this talk, we explore the role of differential geometry in non-Hermitian quantum physics. We then demonstrate how hidden dimensions naturally emerge from parameter spaces, examining their relation to Berry connections and curvatures. Finally, we highlight unexpected topological structures residing...
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07/10/2026, 10:15
The replica trick is widely used to calculate entanglement and R\'enyi entropies in conformal field theory, but its application to logarithmic and non-unitary theories is less understood. We study this problem in $c=-2$ logarithmic CFTs, using symplectic fermions and the continuum theory of the non-Hermitian SSH model as complementary realizations. We find an odd--even splitting of the R\'enyi...
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07/10/2026, 11:30
Non-Hermitian Hamiltonians have biorthogonal quantum properties, defined through left and right eigenstates, that are not directly accessible in standard quantum measurements. Naimark dilation offers a route around this obstacle. It embeds a pseudo-Hermitian system into a larger Hermitian system with an ancilla, while preserving the energy spectrum. We first realize this protocol on quantum...
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07/10/2026, 13:30
Reliable generation and control of quantum states with genuine quantum correlations,
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particularly multipartite entangled states, are essential for quantum technologies, including
quantum information processing, quantum thermodynamics, and metrology. Yet unavoidable
dissipation can limit their fidelity and preparation speed. Non-Hermitian systems offer a
promising route to harness... -
07/10/2026, 14:50
The entanglement Hamiltonian provides a powerful way of characterizing the structure of a quantum many-body state, but a fundamental question remains: what kind of many-body Hamiltonian does it actually define? I will address this question through two contrasting examples in quantum spin ladders. I will first discuss a non-Hermitian spin ladder in the rung-singlet regime, where the reduced...
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