Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Entropic Efficiency of Bayesian Inference Protocols
Nathan Shettell, Alexia Auffèves·Jan 24, 2026
Inference is a versatile tool that underlies scientific discovery, machine learning, and everyday decision-making: it describes how an agent updates a probability distribution as partial information is acquired from multiple measurements, reducing ig...
Formalising an operational continuum limit of quantum combs
Clara Wassner, Jonáš Fuksa, Jens Eisert +1 more·Jan 23, 2026
Quantum combs are powerful conceptual tools for capturing multi-time processes in quantum information theory, constituting the most general quantum mechanical process. But, despite their causal nature, they lack a meaningful physical connection to ti...
Quantum Fisher information analysis for absorption measurements with undetected photons
Martin Houde, Franz Roeder, Christine Silberhorn +2 more·Jan 23, 2026
We theoretically compare the quantum Fisher information (QFI) for three configurations of absorption spectroscopy with undetected idler photons: an SU(1,1) interferometer with inter-source idler loss, an induced-coherence (IC) setup in which the idle...
Protocols to share genuine multipartite entanglement employing copies of biseparable states
Swati Choudhary, Ujjwal Sen, Saronath Halder·Jan 23, 2026
Sharing genuine multipartite entanglement by considering collective use of copies of biseparable states, which are entangled across all bipartitions but lack genuine multipartite entanglement at the single-copy level, plays a central role in several ...
Gluing Randomness via Entanglement: Tight Bound from Second Rényi Entropy
Wonjun Lee, Hyukjoon Kwon, Gil Young Cho·Jan 23, 2026
The efficient generation of random quantum states is a long-standing challenge, motivated by their diverse applications in quantum information processing tasks. In this work, we identify entanglement as the key resource that enables local random unit...
Quantum Sensing MRI for Noninvasive Detection of Neuronal Electrical Activity in Human Brains
Yongxian Qian, Ying-Chia Lin, Seyedehsara Hejazi +12 more·Jan 23, 2026
Neuronal electrical activity underlies human cognition including perception, attention, memory, language, and decision-making. Yet its direct, noninvasive measurement in the living human brain remains a fundamental challenge. Existing neuroimaging te...
Engineering Near-Infrared Two-Level Systems in Confined Alkali Vapors
Gilad Orr, Golan Ben-Ari, Eliran Talker·Jan 22, 2026
We combined experimental and theoretical investigations of an effective two-level atomic system operating in the near-infrared telecom wavelength regime, realized using hot rubidium vapor confined within a sub-micron-thick cell. In this strongly conf...
Post-processing optimization and optimal bounds for non-adaptive shadow tomography
Andrea Caprotti, Joshua Morris, Borivoje Dakić·Jan 22, 2026
Informationally overcomplete POVMs are known to outperform minimally complete measurements in many tomography and estimation tasks, and they also leave a purely classical freedom in shadow tomography: the same observable admits infinitely many unbias...
Quantum Cellular Automata on a Dual-Species Rydberg Processor
Ryan White, Vikram Ramesh, Alexander Impertro +6 more·Jan 22, 2026
As quantum devices scale to larger and larger sizes, a significant challenge emerges in scaling their coherent controls accordingly. Quantum cellular automata (QCAs) constitute a promising framework that bypasses this control problem: universal dynam...
Scaling Sample-Based Quantum Diagonalization on GPU-Accelerated Systems using OpenMP Offload
Robert Walkup, Juha Jäykkä, Igor Pasichnyk +14 more·Jan 22, 2026
Hybrid quantum-HPC algorithms advance research by delegating complex tasks to quantum processors and using HPC systems to orchestrate workflows and complementary computations. Sample-based quantum diagonalization (SQD) is a hybrid quantum-HPC method ...
Quantum Metrology under Coarse-Grained Measurement
Byeong-Yoon Go, Geunhee Gwak, Young-Do Yoon +4 more·Jan 22, 2026
While quantum metrology enables measurement precision beyond classical limits, its performance is often susceptible to experimental imperfections. Most prior studies have focused on imperfections in quantum states and operations. Here, we investigate...
Enhancing the Size of Phase-Space States Containing Sub-Planck-Scale Structures via Non-Gaussian Operations
Arman, Prasanta K. Panigrahi·Jan 22, 2026
We observe a metrological advantage in phase-space sensitivity for photon-added cat and kitten states over their original forms, due to phase-space broadening from increased amplitude via photon addition, albeit with higher energy cost. Using accessi...
Bidirectional teleportation using scrambling dynamics: a practical protocol
Amit Vikram, Edwin Chaparro, Muhammad Miskeen Khan +3 more·Jan 21, 2026
We show that quantum information scrambling can enable a generic SWAP gate between collective degrees of freedom in systems without universal local control. Our protocol combines the Hayden-Preskill recovery scheme, associated with the black hole inf...
NWQWorkflow: The Northwest Quantum Workflow
Ang Li·Jan 21, 2026
This whitepaper presents NWQWorkflow, an end-to-end workflow for quantum application development, compilation, error correction, benchmarking, numerical simulation, control, and execution on a prototype superconducting testbed. NWQWorkflow integrates...
Stabilizer-Code Channel Transforms Beyond Repetition Codes for Improved Hashing Bounds
Tyler Kann, Matthieu R. Bloch, Shrinivas Kudekar +1 more·Jan 21, 2026
The quantum hashing bound guarantees that rates up to $1-H(p_I, p_X, p_Y, p_Z)$ are achievable for memoryless Pauli channels, but it is not generally tight. A known way to improve achievable rates for certain asymmetric Pauli channels is to apply a s...
The computational two-way quantum capacity
Johannes Jakob Meyer, Jacopo Rizzo, Asad Raza +3 more·Jan 21, 2026
Quantum channel capacities are fundamental to quantum information theory. Their definition, however, does not limit the computational resources of sender and receiver. In this work, we initiate the study of computational quantum capacities. These qua...
Superluminal Transformations and Indeterminism
Amrapali Sen, Flavio Del Santo·Jan 21, 2026
Quantum theory is widely regarded as fundamentally indeterministic, yet classical frameworks can also exhibit indeterminism once infinite information is abandoned. At the same time, relativity is usually taken to forbid superluminal signalling, yet L...
Finite de Finetti for convex bodies and Polynomial Optimization
Julius A. Zeiss, Gereon Koßmann, René Schwonnek +1 more·Jan 21, 2026
Leveraging a recently proposed notion of relative entropy in general probabilistic theories (GPT), we prove a finite de Finetti representation theorem for general convex bodies. We apply this result to address a fundamental question in polynomial opt...
USDs: A universal stabilizer decoder framework using symmetry
Hoshitaro Ohnishi, Hideo Mukai·Jan 21, 2026
Quantum error correction is indispensable to achieving reliable quantum computation. When quantum information is encoded redundantly, a larger Hilbert space is constructed using multiple physical qubits, and the computation is performed within a desi...
Multiparameter estimation for the superresolution of two incoherent sources
Antonin Grateau, Alexander Boeschoten, Tanguy Favin-Lévêque +2 more·Jan 21, 2026
We experimentally demonstrate the simultaneous estimation of the three parameters characterizing a pair of incoherent optical sources in the sub-Rayleigh regime, enabling super-resolved scene characterization. Using spatial-mode demultiplexing (SPADE...