Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Revisiting the Role of State Texture in Gate Identification and Fixed-Point Resource Theories
Alexander C. B. Greenwood, Joseph M. Lukens, Li Qian +1 more·Feb 26, 2026
A protocol for identifying controlled-NOT (CNOT) gates versus single-qubit-only gates in universal quantum circuits using randomized input states was recently shown to be intimately connected to the quantum resource of state texture. Here we revisit ...
The unbearable hardness of deciding about magic
Lorenzo Leone, Jens Eisert, Salvatore F. E. Oliviero·Feb 25, 2026
Identifying the boundary between classical and quantum computation is a central challenge in quantum information. In multi-qubit systems, entanglement and magic are the key resources underlying genuinely quantum behaviour. While entanglement is well ...
Computing with many encoded logical qubits beyond break-even
Shival Dasu, Matthew DeCross, Andrew Y. Guo +42 more·Feb 25, 2026
High-rate quantum error correcting (QEC) codes encode many logical qubits in a given number of physical qubits, making them promising candidates for quantum computation. Implementing high-rate codes at a scale that both frustrates classical computing...
Controlled jump in the Clifford hierarchy
Yichen Xu, Xiao Wang·Feb 25, 2026
We develop a simple and systematic route to higher levels of the qubit Clifford hierarchy by coherently controlling Clifford operations. Our approach is based on Pauli periodicity, defined for a Clifford unitary $U$ as the smallest integer $m\ge 1$ s...
Noise-adaptive hybrid quantum convolutional neural networks based on depth-stratified feature extraction
Taehyun Kim, Israel F. Araujo, Daniel K. Park·Feb 25, 2026
Hierarchical quantum classifiers, such as quantum convolutional neural networks (QCNNs), represent recent progress toward designing effective and feasible architectures for quantum classification. However, their performance on near-term quantum hardw...
Analysis of the action of conventional trapped-ion entangling gates in qudit space
Pavel Kamenskikh, Nikita Semenin, Ilia Zalivako +4 more·Feb 25, 2026
Qudits, or multi-level quantum information carriers, present a promising path for scaling quantum computers. However, their use introduces increased complexity in quantum logic, necessitating careful control of relative phases between different qudit...
Imperfect Graphs from Unitary Matrices -- I
Wesley Lewis, Darsh Pareek, Umesh Kumar +1 more·Feb 25, 2026
Matrix representations of quantum operators are computationally complete but often obscure the structural topology of information flow within a quantum circuit \cite{nielsen2000}. In this paper, we introduce a generalized graph-theoretic framework fo...
Optimized ancillary drive for fast Rydberg entangling gates
Rui Li, Min-Hua Zhang, Jing Qian·Feb 25, 2026
Reaching fast and robust two-qubit gates with low infidelities has been an outstanding challenge for the long-term goal of useful quantum computers. Typically, optimizing the pulse shapes can minimize the gate infidelity and improve its robustness to...
CQSA: Byzantine-robust Clustered Quantum Secure Aggregation in Federated Learning
Arnab Nath, Harsh Kasyap·Feb 25, 2026
Federated Learning (FL) enables collaborative model training without sharing raw data. However, shared local model updates remain vulnerable to inference and poisoning attacks. Secure aggregation schemes have been proposed to mitigate these attacks. ...
The Inverse Born Rule Fallacy: On the Informational Limits of Phase-Locked Amplitude Encoding
Sebastian Zając, Jacob L. Cybulski, Bartosz Dziewit +1 more·Feb 24, 2026
In Quantum Machine Learning (QML) and Quantum Finance, amplitude encoding is often motivated by its logarithmic storage capacity arXiv:1307.0411. This paradigm typically relies on the mapping $ψ= \sqrt{P}$, treating the quantum state as a derivative ...
Teleportation transition of surface codes on a superconducting quantum processor
Yiren Zou, Hong-Kuan Xia, Aosai Zhang +32 more·Feb 24, 2026
The topological surface code is a leading candidate for harnessing long-range entanglement to protect logical quantum information against errors, and teleportation of logical states is desirable for robust quantum information processing. Nevertheless...
Correcting coherent quantum errors by going with the flow
Wayne M. Witzel, Anand Ganti, Tzvetan S. Metodi·Feb 24, 2026
The performance of a given quantum error correction (QEC) code depends upon the noise model that is assumed. Independent Pauli noise, applied after each quantum operation, is a simplistic noise model that is easy to simulate and understand in the con...
Qudit stabiliser codes for $\mathbb{Z}_N$ lattice gauge theories with matter
Luca Spagnoli, Alessandro Roggero, Nathan Wiebe·Feb 24, 2026
In this work we extend the connection between Quantum Error Correction (QEC) and Lattice Gauge Theories (LGTs) by showing that a $\mathbb{Z}_N$ gauge theory with prime dimension $N$ coupled to dynamical matter can be expressed as a qudit stabilizer c...
First- and Second-Order Digital Quantum Simulation of Three-Level Jaynes-Cummings Dynamics on Superconducting Quantum Processors
J. Thirunirai Selvam, S. Saravana Veni, Ria Rushin Joseph·Feb 24, 2026
This work presents a digital quantum simulation of a three-level atomic system interacting with a single-mode electromagnetic field based on the Jaynes-Cummings model, implemented on IBM Quantum superconducting processors. A qutrit is encoded using t...
Non-Clifford symmetry protected topological higher-order cluster states in multi-qubit measurement-based quantum computation
Motohiko Ezawa·Feb 24, 2026
A cluster state is a strongly entangled state, which is a source of measurement-based quantum computation. It is generated by applying controlled-Z (CZ) gates to the state $\left\vert ++\cdots +\right\rangle $. It is protected by the $\mathbb{Z}_{2}^...
Pulse-level control for quantum resource preparation
K. De La Ossa Doria, T. Merlo Vergara, D. Goyeneche·Feb 23, 2026
Minimizing the time required for quantum state preparation is crucial to mitigate decoherence and enable practical quantum algorithms on near-term hardware. In this work, we introduce a technique for quantum state preparation in transmon-qubit system...
Quantum algorithm for simulating resonant inelastic X-ray scattering in battery materials
Ignacio Loaiza, Alexander Kunitsa, Stepan Fomichev +9 more·Feb 23, 2026
Resonant inelastic X-ray scattering (RIXS) is the workhorse experimental technique for probing the structural degradation of higher-capacity cathode materials. However, the interpretation of experimental spectra is challenging due to the lack of accu...
Quantum Simulations for Extreme Ultraviolet Photolithography
Tyler D. Kharazi, Stepan Fomichev, Shu Kanno +4 more·Feb 23, 2026
Extreme Ultraviolet (EUV) lithography is the state-of-the-art process in semiconductor fabrication, yet its spatial resolution is fundamentally limited by the ``blur'' originating from absorption of photons at 92 eV, which induce physical and chemica...
Experimental characterization of coherent and non-Markovian errors using tangent space decomposition
Elia Perego, Andrea Rodriguez-Blanco, K. Birgitta Whaley +1 more·Feb 23, 2026
Accurate characterization of coherent and non-Markovian errors remains a central challenge in quantum information processing, as conventional benchmarking techniques typically rely on Markovian and time-independent noise assumptions. In practice, how...
Characterization and active cancellation of power-line-induced motional-mode frequency noise in a trapped-ion system
Jaehun You, Jiyong Kang, Kyunghye Kim +2 more·Feb 23, 2026
The stability of motional-mode frequency is essential for realizing high-fidelity quantum gates in trapped-ion quantum computing. While broadband Gaussian noise has been extensively studied and mitigated using pulse shaping techniques, the impact of ...