652 citations
- Northampton Community CollegeUS27 papers
- University of OxfordGB23 papers
- Imperial College LondonGB19 papers
- Nankai UniversityCN18 papers
- Heinrich Heine University DüsseldorfDE13 papers
- Centre National de la Recherche ScientifiqueFR11 papers
- London Institute for Mathematical SciencesGB11 papers
- Queen Mary University of LondonGB10 papers
- University College LondonGB10 papers
- The Alan Turing InstituteGB9 papers
- Humboldt-Universität zu BerlinDE8 papers
- Royal Institution of Great BritainGB8 papers
26 papers · 1 filter
Quantum-classical diagnostics and Bohmian inequivalence for higher time-derivative Hamiltonians
Sanjib Dey, Andreas Fring
We develop a Bohmian analysis of a two-dimensional ghost Hamiltonian and its mapping to the degenerate Pais-Uhlenbeck model. Using Gaussian wavepackets, we derive the corresponding…
Spectrum-generating algebra and intertwiners of the resonant Pais-Uhlenbeck oscillator
Andreas Fring, Ian Marquette, Takano Taira
We study the quantum Pais-Uhlenbeck oscillator at the resonant (equal-frequency) point, where the dynamics becomes non-diagonalisable and the conventional Fock-space construction c…
Quantisations of exactly solvable ghostly models
Andreas Fring, Takano Taira, Bethan Turner
We investigate an exactly solvable two-dimensional Lorentzian coupled quantum system that in a certain parameter regime can be transformed to a higher time derivative theory (HTDT)…
The role of data embedding in quantum autoencoders for improved anomaly detection
Jack Y. Araz, Michael Spannowsky
The performance of Quantum Autoencoders (QAEs) in anomaly detection tasks is critically dependent on the choice of data embedding and ansatz design. This study explores the effects…
Phase transitions and thermodynamic cycles in the broken PT-regime
Andreas Fring, Marta Reboiro
We propose a new type of quantum thermodynamic cycle whose efficiency is greater than the one of the classical Carnot cycle for the same conditions for a system when viewed as homo…
Non-Hermitian Quantum Fermi Accelerator
Andreas Fring, Takano Taira
We exactly solve a quantum Fermi accelerator model consisting of a time-independent non-Hermitian Hamiltonian with time-dependent Dirichlet boundary conditions. A Hilbert space for…