Tootfinder

“It is better to remain silent at the risk of being thought a fool, than to talk and remove all doubt of it.”
– Maurice Switzer https://ec.social-network.europa.eu/@EUCommission/114789191589954642

European Commission (@EUCommission@ec.social-network.europa.eu)
Attached: 1 image As temperatures soar, here is something cool for Europe’s future. ⚛️ Introducing the Quantum Europe Strategy: A plan to bring together EU countries, industry, academia and society to unlock the full power of quantum tech. Europe is well-positioned to lead the ongoing quantum revolution, focusing our strategy on: 🔬 R&I 🏗️ Infrastructures 🛰️ Space and Dual-use 🎓 Skills 🌐 Quantum ecosystem Quantum will transform key sectors and Europe will lead the…

Toward graviton detection via photon-graviton quantum state conversion
Taiki Ikeda, Youka Kaku, Sugumi Kanno, Jiro Soda
https://arxiv.org/abs/2507.01609 ht…

Toward graviton detection via photon-graviton quantum state conversion
A magnetic field enables the interconversion of photons and gravitons, yet the process is usually analysed only at the level of classical wave equations. We revisit photon-graviton conversion in a quantum field theoretic framework, allowing us to track the evolution of arbitrary quantum states. Treating the photons as squeezed coherent states and the gravitons as the squeezed vacuum expected for primordial gravitational waves, we derive analytic expressions for the conversion probability and sh…

Quantum Phase Space Tomography for Electromagnetic Biomaterial Imaging
Alessandro Settimi
https://arxiv.org/abs/2509.00534 https://arxiv.org/pdf/2509.00534…

Quantum Phase Space Tomography for Electromagnetic Biomaterial Imaging
I present a concise, first principles metrological framework for imaging dielectric biomaterials by probing the full phase space (Wigner) distribution of a quantum electromagnetic field. Building on a rigorous multilayer Maxwell and Cole Cole model for stratified tissue, my method (Quantum Phase space Tomography, QPST) couples analytical forward theory with quantum metrology and Bayesian inference. I prepare a structured quantum EM probe (e.g. a squeezed microwave pulse) that interacts with tis…

Performance of multiple filter-cavity schemes for frequency-dependent squeezing in gravitational-wave detectors
Jacques Ding, Eleonora Capocasa, Isander Ahrend, Fangfei Liu, Yuhang Zhao, Matteo Barsuglia
https://arxiv.org/abs/2506.02222

Performance of multiple filter-cavity schemes for frequency-dependent squeezing in gravitational-wave detectors
Gravitational-wave detectors use state-of-the-art quantum technologies to circumvent vacuum fluctuations via squeezed states of light. Future detectors such as Einstein Telescope may require the use of two filter cavities or a 3-mirror, coupled filter cavity to achieve a complex rotation of the squeezing ellipse in order to reduce the quantum noise over the whole detector bandwidth. In this work, we compare the theoretical feasibility and performances of these two systems and their resilience w…

Green Computing: The Ultimate Carbon Destroyer for a Sustainable Future
Sayed Mahbub Hasan Amiri, Prasun Goswami, Md. Mainul Islam, Mohammad Shakhawat Hossen, Marzana Mithila, Naznin Akter
https://arxiv.org/abs/2508.00153

Green Computing: The Ultimate Carbon Destroyer for a Sustainable Future
Green computing represents a critical pathway to decarbonize the digital economy while maintaining technological progress. This article examines how sustainable IT strategies including energy-efficient hardware, AI-optimized data centres, and circular e-waste systems can transform computing into a net carbon sink. Through analysis of industry best practices and emerging technologies like quantum computing and biodegradable electronics, we demonstrate achievable reductions of 40-60% in energy co…

Multi-mode cooling of a Bose-Einstein condensate with linear quantum feedback
Zain Mehdi, Matthew L. Goh, Matthew J. Blacker, Joseph J. Hope, Stuart S. Szigeti
https://arxiv.org/abs/2506.02377

Multi-mode cooling of a Bose-Einstein condensate with linear quantum feedback
We theoretically investigate measurement-based feedback control over the motional degrees of freedom of an oblate quasi-2D atomic Bose-Einstein condensate (BEC) subject to continuous density monitoring. We develop a linear-quadratic-Gaussian (LQG) model that describes the multi-mode dynamics of the condensate's collective excitations under continuous measurement and control. Crucially, the multi-mode cold-damping feedback control we consider uses a realistic state-estimation scheme that does no…

#SIGBOVIK is at it again: "Factoring up to 255 “with” a Quantum Computer"
"[…] in this paper, I will appear to succeed at factoring by failing with style"
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The Complexity of Thermalization in Finite Quantum Systems
Dhruv Devulapalli, T. C. Mooney, James D. Watson
https://arxiv.org/abs/2507.00405 https://

The Complexity of Thermalization in Finite Quantum Systems
Thermalization is the process through which a physical system evolves toward a state of thermal equilibrium. Determining whether or not a physical system will thermalize from an initial state has been a key question in condensed matter physics. Closely related questions are determining whether observables in these systems relax to stationary values, and what those values are. Using tools from computational complexity theory, we demonstrate that given a Hamiltonian on a finite-sized system, dete…

Unified boson sampling
Luca Bianchi, Carlo Marconi, Laura Ares, Davide Bacco, Jan Sperling
https://arxiv.org/abs/2509.02058 https://arxiv.org/pdf/2509.0205…

Unified boson sampling
Boson sampling is a key candidate for demonstrating quantum advantage, and has already yielded significant advances in quantum simulation, machine learning, and graph theory. In this work, a unification and extension of distinct forms of boson sampling is developed. The devised protocol merges discrete-variable scattershot boson sampling with continuous-variable Gaussian boson sampling. Thereby, it is rendered possible to harness the complexity of more interesting states, such as squeezed photo…

Spin squeezing generation in atom-cavity systems: on the effects of adiabatic elimination beyond the leading order
Stefano Gregorio Giaccari, Giulia Dellea, Marco Giovanni Genoni, Gianluca Bertaina
https://arxiv.org/abs/2506.22383

Spin squeezing generation in atom-cavity systems: on the effects of adiabatic elimination beyond the leading order
Spin-squeezed states are a prototypical example of metrologically useful quantum states where structured entanglement allows for enhanced sensing with respect to the one possible using classically correlated particles. Relevant aspects are both the efficient preparation of spin-squeezed states and the scalability of estimation precision with the number $N$ of probes. Recently, in the context of the generation of spin-squeezed states via coupling of three-level atoms to an optical cavity, it was…