Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Space-Efficient Quantum Algorithm for Elliptic Curve Discrete Logarithms with Resource Estimation
Han Luo, Ziyi Yang, Ziruo Wang +2 more·Apr 2, 2026
Solving the Elliptic Curve Discrete Logarithm Problem (ECDLP) is critical for evaluating the quantum security of widely deployed elliptic-curve cryptosystems. Consequently, minimizing the number of logical qubits required to execute this algorithm is...
Lemniscate phase trajectories for high-fidelity GHZ state preparation in trapped-ion chains
Evgeny V. Anikin, Andrey Chuchalin, Dimitrii Donchenko +2 more·Apr 2, 2026
In trapped-ion chains, multipartite GHZ states can be prepared natively with the help of a single bichromatic laser pulse. However, higher-order terms in the expansion in the Lamb-Dicke parameter $η$ limit the GHZ state preparation infidelity for rec...
Commutator Estimates for Low-Temperature Fermi Gases
Jacky J. Chong, Laurent Lafleche, Jinyeop Lee +1 more·Apr 2, 2026
We investigate the semiclassical regularity of thermal equilibria in the presence of a harmonic potential at low temperature; that is, we obtain the asymptotic behavior of the Schatten norms of commutators of the one-body operators associated with th...
Tensor invariants for multipartite entanglement classification
Sylvain Carrozza, Johann Chevrier, Luca Lionni·Apr 2, 2026
Organising the space of entanglement structures of a multipartite quantum system is a much more challenging task than its bipartite version: while the local unitary (LU) orbit of a bipartite pure state can be conveniently characterized by its entangl...
Explicit constructions of mutually unbiased bases via Hadamard matrices
Jean-Christophe Pain·Apr 2, 2026
We present a detailed computational and algebraic study of Mutually Unbiased Bases (MUBs) in finite-dimensional Hilbert spaces, with a particular focus on dimensions 2, 3, 4, and the challenging case of 6. Starting from the Hadamard-phase parametriza...
Quantum Time-Space Tradeoffs for Exponential Dynamic Programming
Susanna Caroppo, Jevgēnijs Vihrovs, Dārta Zajakina +1 more·Apr 2, 2026
We investigate the quantum algorithms for dynamic programming by Ambainis et al. (SODA'19). While giving provable complexity speedups and applicable to a variety of NP-hard problems, these algorithms have a notable drawback: they require a large amou...
High-bandwidth Coherence Cloning using Optical-Phase-Locking Feedforward
Chen Jia, Zhen-Xing Hua, Yu-Xin Chao +1 more·Apr 2, 2026
Ultra-narrow-linewidth lasers with suppressed high-frequency phase noise are critical for quantum control and precision metrology. While optical phase locking (OPL) is the standard technique for cloning the coherence of such sources, its effectivenes...
QuantumXCT: Learning Interaction-Induced State Transformation in Cell-Cell Communication via Quantum Entanglement and Generative Modeling
Selim Romero, Shreyan Gupta, Robert S. Chapkin +1 more·Apr 2, 2026
Inferring cell-cell communication (CCC) from single-cell transcriptomics remains fundamentally limited by reliance on curated ligand-receptor databases, which primarily capture co-expression rather than the system-level effects of signaling on cellul...
A Pragmatist Understanding of Quantum Mechanics
Richard Healey·Apr 2, 2026
Applications of quantum mechanics have led to many successful predictions and explanations of puzzling phenomena, and we now apply quantum mechanics to gain, process, and communicate information in novel ways. We can understand quantum mechanics by u...
Shot-to-shot noise cancellation for parametric oscillators
Martynas Skrabulis, Martin Colombano Sosa, Nicola Carlon Zambon +4 more·Apr 2, 2026
Powerful approaches to squeeze the motional state of a harmonic oscillator rely on the stepwise modulation of its resonance frequency. Such protocols can be limited by forces that vary slowly between experimental runs but are constant during a single...
The Phase Quantum Walk: A Unified Framework for Graph State Distribution in Quantum Networks
Soumyojyoti Dutta·Apr 2, 2026
Distributing arbitrary graph states across quantum networks is a central challenge for modular quantum computing and measurement-based quantum communication. I introduce the phase quantum walk (PQW), a discrete-time quantum walk in which the conventi...
Q2NS Demo: A Quantum Network Simulator Based on ns-3
Francesco Mazza, Adam Pearson, Marcello Caleffi +1 more·Apr 2, 2026
Q2NS is an open-source quantum network simulator built on ns-3, the de facto standard for classical network simulation. By inheriting ns-3's mature classical stack and event-driven execution model, Q2NS enables faithful co-simulation of quantum-netwo...
Constrained Quantum Optimization via Iterative Warm-Start XY-Mixers
David Bucher, Maximilian Janetschek, Michael Poppel +3 more·Apr 2, 2026
The Quantum Approximate Optimization Algorithm (QAOA) is a leading hybrid heuristic for combinatorial optimization, but efficiently handling hard constraints remains a significant challenge. XY-mixers successfully confine quantum state evolution to a...
Photonic qubit encoding interconversion for heterogeneous quantum networking
Vedansh Nehra, Richard J. Birrittella, Christopher C. Tison +10 more·Apr 2, 2026
Quantum information processing, communication, and sensing networks are being developed with various qubit platforms that use different encoding schemes. Connecting quantum network nodes to distribute entanglement requires matching photon qubit basis...
Emergence of volume-law scaling for entanglement negativity from the Hawking radiation of analogue black holes
S. Mahesh Chandran, Uwe R. Fischer·Apr 2, 2026
The quantum information content of Hawking radiation holds the key to understanding black-hole evaporation and the fate of unitarity. Motivated by recent advances in cold-atom experiments, we develop a lattice-regularization approach aimed at simulat...
Quantitative Universal Approximation for Noisy Quantum Neural Networks
Lukas Gonon, Antoine Jacquier, Marcel Mordarski·Apr 2, 2026
We provide here a universal approximation theorem with precise quantitative error bounds for noisy quantum neural networks. We focus on applications to Quantitative Finance, where target functions are often given as expectations. We further provide a...
Ultrafast Ionization Dynamics Encoded in a Photoelectron Spin Torus
Xiaodan Mao, Feng He, Pei-Lun He·Apr 2, 2026
We demonstrate that strong-field ionization of atoms in circularly polarized laser fields generates a photoelectron spin texture with toroidal topology in momentum space. Using time-dependent Schrödinger equation simulations, spin-resolved classical-...
Efficient Auxiliary-Field Quantum Monte Carlo using Isometric Tensor Hypercontraction
Maxine Luo, Victor Chen, Yu Wang +1 more·Apr 2, 2026
Auxiliary Field Quantum Monte Carlo (AFQMC) has emerged as a powerful framework for treating strongly correlated electronic systems, offering a favorable balance between computational cost and accuracy. In this paper, we present a novel AFQMC method ...
High-threshold decoding of non-Pauli codes for 2D universality
Julio C. Magdalena de la Fuente, Noa Feldman, Jens Eisert +1 more·Apr 2, 2026
Topological codes have many desirable properties that allow fault-tolerant quantum computation with relatively low overhead. A core challenge for these codes, however, is to achieve a low-overhead universal gate set with limited connectivity. In this...
Quantum search algorithm for similar subgraph identification under fixed edge removal
Ruben Kara, Sven Danz, Tobias Stollenwerk +1 more·Apr 2, 2026
We introduce a novel quantum algorithm for similar subgraph identification in form of an NP-hard cardinality-constrained binary quadratic optimization problem. Given a weighted reference graph with Laplacian $\boldsymbol{B}$, our algorithm determines...