Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Quantum probe advantage in learning many-body systems
Wenzheng Dong, Andrew G. Green, Vlatko Vedral +1 more·Jul 13, 2026
Which properties of a quantum many-body system are operationally accessible is a central question underlying spectroscopy, thermodynamics, and quantum information science. Conventional response theory answers this question within a system-only paradi...
Multiparameter Quantum Estimation in a Raman-Coupled Two-Qubit System
Omar Bachain, Mohamed Amazioug, Rachid Ahl Laamara·Jul 13, 2026
We investigate multiparameter quantum estimation in a Raman-coupled two-qubit system at thermal equilibrium. Analytical expressions for the quantum Fisher information matrix are derived to characterize the simultaneous estimation of the temperature a...
Private Capacity of Quantum Channels Induced by Non-stabilizer Environmental States
Chunhe Xiong, Sunho Kim, Long Long +1 more·Jul 13, 2026
We investigate the private capacity of quantum channels using the recently proposed quantum convolution theory for discrete-variable quantum systems. We focus on the role of the magic resource played in this framework. Firstly, for a large class of c...
A new class of pure non-Gaussian quantum states
V. L. Gorshenin, B. N. Nougmanov, D. A. Chermoshentsev +2 more·Jul 13, 2026
We discuss a new class of pure non-Gaussian quantum states of light characterized by trigonal symmetry on the phase plane. We propose the term ``trigonal states'' for them and show that they can be generated using the standard non-degenerate four-wav...
Spacer-Mediated Gold Nanocube Arrays for Edge-Localized Excitonic Enhancement in Monolayer MoS2
Abdullah Efe Yildiz, Emre Ozan Polat·Jul 13, 2026
Plasmonic nanostructures offer an effective route for enhancing light-matter interaction in atomically thin semiconductors, whose optical response is intrinsically limited by their sub-nanometer active thickness. Here, we numerically investigate exci...
Operational Concealment of Measurement Incompatibility by Quantum Channels
Mohd Asad Siddiqui, Zizhu Wang·Jul 13, 2026
Measurement incompatibility can remain intact at the operator level yet become operationally inaccessible when observations are restricted to the output of a quantum channel; we refer to this phenomenon as operational concealment. We develop a system...
Higher-order covariance matrices for non-Gaussian quantum states
Vojtěch Kala, Petr Marek, Nicolas J. Cerf·Jul 13, 2026
Covariance matrices lie at the heart of the powerful and well-established symplectic framework for describing continuous-variable Gaussian quantum states. However, since this framework only relies on first- and second-order moments, it is not suffici...
Deploying and validating a metropolitan QKD secure network: architecture and field performance
Claudia De Lazzari, Nicola Biagi, Damiano Giani +15 more·Jul 13, 2026
The advent of cryptographically relevant quantum computers poses an existential threat to classical public-key infrastructure. Quantum Key Distribution (QKD) addresses this challenge by providing information-theoretic security for key establishment, ...
High-field Josephson effect enabled by a moiré Hofstadter spectrum
A. Díez-Carlón, M. Cárdenes Wuttig, N. Wei +7 more·Jul 13, 2026
Magnetic fields generally suppress phase-coherent Josephson transport, limiting superconducting interferometry to relatively low fields. Here we show that moiré-engineered graphene Josephson junctions can overcome this constraint. Using ballistic gra...
Quantum-classical neurons upgraded with optical spin qubits for advanced computing and networking architectures
Osama M. Nayfeh·Jul 13, 2026
Hardware neurons incorporating built-in memory components are critical technologies for implementing large scale neural networks that exhibit adaptive-itinerant behavior and produce biological-inspired spiking patterns that match neuroscience known o...
Interlocked Time Crystal in Coupled Spin-1/2 Ensembles under Local Dissipation
Zhen-Huan Yang, Zhen-Tao Liang, Dan-Bo Zhang·Jul 13, 2026
Multilevel dissipative systems can exploit multiple local transitions and coherence channels to generate nonstationary time-crystalline dynamics. Here we show that an analogous mechanism can be synthesized without enlarging the local Hilbert space by...
Quantum Arithmetic Circuits in Public-Key Cryptography
Siyi Wang, Kyungbae Jang, Hyunji Kim +4 more·Jul 13, 2026
Quantum computing has advanced rapidly in recent decades, driven by developments across the technology stack, including quantum error-correcting codes and efficient quantum algorithms. Among these, quantum arithmetic circuits serve as fundamental bui...
Near-Optimal Mode Scaling for Finite-Dimensional Boson Sampling via Lie-Algebraic Leakage Bounds
Chon-Fai Kam, En-Jui Kuo·Jul 13, 2026
Boson sampling demonstrates quantum advantage through the interference of indistinguishable particles, with output probabilities governed by matrix permanents. Realizing it on deterministic, matter-based platforms requires encoding the bosonic modes ...
$\mathtt{Q^2SAR}$: overcoming classical bottlenecks in drug discovery via quantum multiple kernel learning
Mariano Caruso, Daniel Ruiz, Alejandro Giraldo +1 more·Jul 13, 2026
Quantitative Structure-Activity Relationship ($\mathtt{QSAR}$) modeling is a foundational computational methodology in early-stage drug discovery, heavily relied upon for predicting compound toxicity, bioavailability, and therapeutic potential. Howev...
Multi-Stage Mamba-Based Architecture for Fast and Scalable Superconducting Qubit Readout
Luca Otting, Xiaorang Guo, Emmanouil Giortamis +3 more·Jul 13, 2026
Reliable qubit readout is a critical bottleneck toward fault-tolerant quantum computing (FTQC). In superconducting quantum processors, readout operations are both error-prone and high-latency. These challenges become more severe in frequency-multiple...
The Time-Space Complexity of Checking Multiple Assertions in Quantum Programs
Shengyuan Yang, Charles Yuan·Jul 13, 2026
Runtime assertions are a promising mechanism for testing and debugging quantum programs. But unlike the classical world, checking a quantum program that contains multiple assertions often requires using additional space or running the program additio...
Anomalous Dissipation in Current Biased Josephson Systems
Johannes Hauff, Niklas Gaiser, Joachim Ankerhold +1 more·Jul 13, 2026
A new phase diffusive regime in a current biased Josephson junction is theoretically explored which originates from embedding the junction in a circuit environment with anomalous dissipation. This is realized by placing parallel to the junction a res...
Holographic Timelike Entanglement and Subregion Complexity in Localized AdS3*S3*T4 Black Holes
Jitendra Pal, Yu Shi·Jul 13, 2026
We study timelike entanglement entropy and timelike subregion complexity in localized black holes with asymptotic AdS3*S3*T4 geometry, focusing on the black-pole solution. Unlike the BTZ solution, the black pole exhibits a nontrivial dependence on th...
From Circuits to Hardware: Benchmarking Standard and Qubit-Efficient Quantum Optimization on Real Hardware
Monit Sharma, Hoong Chuin Lau·Jul 13, 2026
Despite rapid progress in quantum optimization, broad real-hardware benchmarks comparing multiple algorithmic families across diverse combinatorial problems under a common protocol remain limited. We benchmark gate-based quantum optimization on four ...
Moment-Structured Block Encodings of Periodic Finite-Difference Operators
Jishnu Mahmud, Rebekah Herrman·Jul 13, 2026
Block encoding is the standard technique for accessing matrix data in quantum linear-algebra algorithms. Its implementation directly affects its subnormalization, which in turn controls the algorithm's success probability, simulation time, and downst...