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Erik Bashore (Uppsala University)
We propose a quantum algorithm for computing the n-gluon maximally helicity violating (MHV) tree-level scattering amplitude. We revisit a newly proposed method for unitarisation of non-unitary operations and present how this implementation can be used to create quantum gates responsible for the color and kinematic factors of the gluon scattering amplitude. As a proof-of-concept, we detail the...
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Dr Robert Potvliege (Durham University, Physics Department)
It has long been recognised that high‑precision hydrogen spectroscopy places stringent bounds on the strength of a hypothetical new spin‑independent interaction [1,2]. The earlier work in this area has since been extended to the spectroscopy of deuterium, muonic hydrogen, muonic deuterium, helium and muonic helium [3-6], as well as to other theoretical and experimental inputs [7]. These later...
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Jonathan Klimesch (University of Tübingen)
Current and next-generation gravitational wave detectors are designed by human experts who must balance coupled physical effects across many domains. The vast space of all possible experiment designs suggests that many high-sensitivity, unconventional detectors may lie beyond the reach of human intuition alone. AI-based methods are increasingly capable of discovering powerful measurement...
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Jan Schumann (University of Tübingen)
In noisy quantum metrology, information about an unknown parameter is lost to the environment and thus inaccessible for any measurement on the system alone. Continuously monitoring the reservoir's output allows to partially recover the lost information, quantified by the unraveling quantum Fisher information (QFI) [1]. This unraveling strategy is particularly relevant for cavity- and...
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Robert Mattes
Quantum systems in nonequilibrium conditions, where coherent many-body interactions compete with dissipative effects, can feature rich phase diagrams and emergent critical behavior. Associated collective effects, together with the continuous observation of quanta dissipated into the environment—typically photons—allow one to achieve quantum-enhanced parameter estimation [1]. However, protocols...
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Matthew Jones (Durham)
I will discuss experimental aspects of new physics searches with cold atoms. The focus will be on Rydberg states of cold hydrogen and deuterium atoms and their application to searches for additional ``fifth forces’’ [1,2]. In particular, I will explore the experimental challenge of realizing cold, trapped samples of hydrogen and deuterium [3,4] and some possible solutions. I will also...
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Mahdi Rouhbakhshnabati (Institut für Theoretische Physik, Eberhard-Karls-Universität Tübingen, 72076 Tübingen, Germany)
Quantum-chaotic dynamics in mixed phase space can enhance metrological sensitivity through mechanisms governed by global homoclinic structures. Building on a semiclassical formulation of the quantum Fisher information, we show that global homoclinic manifolds provide a practical guide to the most sensitive initial states. These manifolds organize transport near edge-of-chaos boundaries into...
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Takanao Ishii (The University of Tokyo)
Although the local precision limits of thermal equilibrium metrology are well established, the potential to enhance precision by driving a system into nonequilibrium remains largely unexplored. We first demonstrate that the precision limit of thermal equilibrium metrology can be surpassed by applying a unitary drive to the initial thermal equilibrium state. Our central result is to establish...
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johann gil (Jan Dlugosz University in Czestochowa)
Abstract:
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Recent developments in black hole physics suggest that Hawking radiation may originate from an extended region outside the event horizon, known as the quantum atmosphere. This motivates the study of spatially dependent quantum effects in curved spacetime.
We investigate bosonic quantum correlations in a bipartite system in the vicinity of a Schwarzschild black hole, where one... -
Emre Kose (Instituto de Física Corpuscular (IFIC), CSIC‐Universitat de València, Spain)
We present a local framework for quantum parameter estimation in linear optical systems, where the unknown parameter is encoded through deformations of an experimentally accessible mode basis. The resulting quantum Fisher information decomposes into two distinct contributions: a coherent contribution, generated by parameter-induced dynamics within the accessible modes and capable of Heisenberg...
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Claudia Frugiuele (Infn milano)
Quantum estimation theory provides a framework for quantifying the ultimate precision limits for parameter estimation in physical systems. I will introduce its basic concepts and apply them to neutrino oscillations, focusing on the estimation of the PMNS parameters.
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A central puzzle is why the CP-violating phase δCP remains significantly less constrained than the other mixing parameters.... -
Rohan Kulkarni (Queen's University)
Abstract. Two-photon transitions in a coherently prepared atomic medium support cooperative emission rates that scale as $N^{2}$, where $N$ is the number of emitters in the coherence volume. Because the two signal photons are emitted back-to-back, their momenta cancel and the Dicke phase-matching constraint met, so that the coherence volume can be made macroscopic. Together these features make...
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Felix Kahlhoefer (Karlsruhe Institute of Technology)
I will present novel ideas to search for the scattering of dark matter particles with mass below the GeV scale using superfluid helium detectors. First, I will introduce the upcoming DELight experiment, which will use magnetic microcalorimeters to detect photons and collective excitations produced by dark matter scattering. The sensitivity of such a search can be extended further by...
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Tanmay Kumar Poddar (IPPP, Durham University)
Ultralight bosons provide well-motivated candidates for physics beyond the Standard Model and may couple weakly to photons or fermions. If sourced by laboratory-scale objects, such fields can generate long-range potentials that imprint measurable phase shifts or induce currents in superconducting Josephson systems. In particular, an oscillating axion dark matter background can produce an...
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Joerg Jaeckel (ITP Heidelberg)
The exchange of new light(ish) bosons coupled to electrons and nucleons leads to extra forces and corresponding potentials between particles and even macroscopic bodies. The high accuracy achievable in measurements on atoms and ions provides a powerful laboratory to test these forces at atomic and smaller distances. We discuss new tests of axion-like particles in highly charged ions, but also...
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Shubhang Dadhich (University of Tübingen)
The gravitational field of ultra-relativistic particles has never been measured. The LHC proton beam at γ ≈ 7500 offers a unique terrestrial source to probe gravity in this regime, where scalar-tensor theories predict deviations from general relativity. We characterise the spectral properties of the gravitational signal arising from realistic beam-filling patterns, explore modulation...
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