Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
On super additivity of Fisher information in fully Gaussian metrology
Javier Navarro, Simon Morelli, Mikel Sanz +1 more·Dec 23, 2025
Famously, the quantum Fisher information -- the maximum Fisher information over all physical measurements -- is additive for independent copies of a system and the optimal measurement acts locally. We are left to wonder: does the same hold when the s...
Small quantum Tanner codes from left--right Cayley complexes
Anthony Leverrier, Wouter Rozendaal, Gilles Zémor·Dec 23, 2025
Quantum Tanner codes are a class of quantum low-density parity-check codes that provably display a linear minimum distance and a constant encoding rate in the asymptotic limit. When built from left--right Cayley complexes, they can be described throu...
Run-and-Tumble Dynamics and Zeno--Anti-Zeno Transition in Biased Quantum Trajectories
Aritra Kundu·Dec 23, 2025
We identify the transition from the oscillatory Rabi regime to the localized Zeno/Anti-Zeno regime in continuous measurement and feedback of a qubit as a quantum analogue of Motility-Induced Phase Separation (MIPS). A mapping between a biased monitor...
Macroscopically distinguishable superposition in infinitely many degrees of freedom
J. Fransson, B. C. Sanders, A. P. Sowa·Dec 23, 2025
We investigate the concept of macroscopically distinguishable superpositions within an infinite array of boson sites. Our approach is rigorous within the frame of Hilbert space theory. In this context, it is natural to differentiate between states --...
End-to-end Optimization of Single-Shot Quantum Machine Learning for Bayesian Inference
Theodoros Ilias, Fangjun Hu, Marti Vives +1 more·Dec 23, 2025
We introduce an end-to-end optimization strategy for quantum machine learning that directly targets performance under finite measurement resources, where learning objectives are defined directly at the level of task performance. The method is applied...
A High-Dimensional Quantum Blockchain Protocol Based on Time- Entanglement
Aktaş, Arzu, Yılmaz +1 more·Dec 23, 2025
Rapid advancements in quantum computing and machine learning threaten the long-term security of classical blockchain systems, whose protection mechanisms largely rely on computational difficulties. In this study, we propose a quantum blockchain proto...
Enriching Earth Observation labeled data with Quantum Conditioned Diffusion Models
Francesco Mauro, Francesca De Falco, Lorenzo Papa +5 more·Dec 23, 2025
The rapid adoption of diffusion models (DMs) in the Earth Observation (EO) domain has unlocked new generative capabilities aimed at producing new samples, whose statistical properties closely match real imagery, for tasks such as synthesizing missing...
Quantum Bayesian Optimization for the Automatic Tuning of Lorenz-96 as a Surrogate Climate Model
Paul J. Christiansen, Daniel Ohl de Mello, Cedric Brügmann +6 more·Dec 23, 2025
In this work, we propose a hybrid quantum-inspired heuristic for automatically tuning the Lorenz-96 model -- a simple proxy to describe atmospheric dynamics, yet exhibiting chaotic behavior. Building on the history matching framework by Lguensat et a...
Scaling roadmap for modular trapped-ion QEC and lattice-surgery teleportation
César Benito, Alfredo Ricci Vasquez, Jonathan Home +4 more·Dec 23, 2025
We present a footprint study for the scaling of modular quantum error correction (QEC) protocols designed for triangular color codes, including a lattice-surgery-based logical teleportation gadget, and compare the performance of various possible arch...
Exploring the nature of gravity with quantum information methods
Bruna Sahdo, Natália Salomé Móller·Dec 23, 2025
The aim of this article is to provide an introduction to the use of quantum information methods for investigating the interface between quantum theory and gravity. To this end, we discuss the basic principles of two current research streams that use ...
Metrologically advantageous states: long-range entanglement and asymmetric error correction
Junjie Chen, Rui Luo, Yuxuan Yan +2 more·Dec 23, 2025
Quantum metrology aims to exploit many-body quantum states to achieve parameter-estimation precision beyond the standard quantum limit. For unitary parameter encoding generated by local Hamiltonians, such enhancement is characterized by superlinear s...
Topological resolution of conical intersection seams and the coupled cluster bifurcation via mixed Hodge modules
Prasoon Saurabh·Dec 23, 2025
The rigorous description of Conical Intersections (CIs) remains the central challenge of non-adiabatic quantum chemistry. While the ``Yarkony Seam'' -- the $(3N-8)$-dimensional manifold of degeneracy -- is well-understood geometrically, its accurate ...
Profusion of Symmetry-Protected Qubits from Stable Ergodicity Breaking
Thomas Iadecola, Rahul Nandkishore·Dec 23, 2025
We show how combining a discrete symmetry with topological Hilbert space fragmentation can give rise to exponentially many topologically stable qubits protected by a single discrete symmetry. We illustrate this explicitly with the example of the $\ma...
Storage and retrieval of optical skyrmions with topological characteristics
Jinwen Wang, Xin Yang, Yun Chen +10 more·Dec 23, 2025
Optical skyrmions are topological structures of light whose defining property, the skyrmion number, is robust against perturbations. This makes them attractive for applications in quantum information storage, where resilience to decoherence is paramo...
Electrical Drive of a Josephson Junction Array using a Cryogenic BiCMOS Pulse Pattern Generator: Towards a Fully Integrated Josephson Arbitrary Waveform Synthesizer
Yerzhan Kudabay, Oliver Kieler, Michael Starkloff +5 more·Dec 23, 2025
We combine a cryogenic BiCMOS integrated circuit, which generates high-speed return-to-zero (RTZ) pulses, with a superconducting Josephson junction array. The BiCMOS circuit acts as a cryogenic pulse pattern generator, delivering data rates of 30 Gb/...
The Exact Uncertainty Relation and Geometric Speed Limits in Krylov Space
Mohsen Alishahiha, Souvik Banerjee·Dec 23, 2025
We show that Hall's exact uncertainty relation acquires a simple geometric form in the Krylov basis generated by the Liouvillian. In this canonical operator frame, the uncertainty equality implies that the operator amplitude vector evolves on the uni...
Lie algebra-assisted quantum simulation and quantum optimal control via high-order Magnus expansions
R. F. dos Santos, S. J. J. M. F. Kokkelmans·Dec 23, 2025
The evolution of a quantum system under time-dependent driving exhibits phenomena that are absent in its stationary counterpart. However, the high dimensionality and non-commutative nature of quantum dynamics make this a challenging problem. The Magn...
A Lovász theta lower bound on Quantum Max Cut
Felix Huber·Dec 23, 2025
We prove a lower bound to quantum Max Cut of a graph in terms of the Lovász theta function of its complement. For a graph with $m$ edges, $\text{qmc}(G) \geq \tfrac{m}{4}\big( 1 + \tfrac{8}{3π}\tfrac{1}{\vartheta(\bar{G}) -1} \big)$, with the bound a...
Macroscopic quantum states, quantum phase transition for $N$ three-level atoms in an optical cavity -- Gauge principle and non-Hermitian Hamiltonian
Ni Liu, Xinyu Jia, J. -Q. Liang·Dec 23, 2025
We study in this paper the quantum phase transition (QPT) from normal phase (NP) to superradiant phase (SP) for $N$ three-level atoms in a single-mode optical cavity for both Hermitian and non Hermitian Hamiltonians, where the $Ξ$-type three-level at...
Exact Solution of Schrödinger equation for Complex Mass Quantum System under Complex Morse Potential to study emergent matter types and its phases
Partha Sarathi, Bhaskar Singh Rawat·Dec 23, 2025
We present exact solutions of the Schrödinger equation for a quantum system with complex mass subjected to a complex Morse potential in the extended complex phase space. The normalized eigenfunctions and corresponding eigenspectra are derived within ...