Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Coherence and Imaginarity as Resources in Quantum Circuit Complexity
Linlin Ye, Zhaoqi Wu, Nanrun Zhou·Apr 7, 2026
Quantum circuit complexity quantifies the minimal number of gates needed to realize a unitary transformation and plays a central role in quantum computation. In this work, we investigate the complexity of quantum circuits through coherence and imagin...
Quantum Learning of Classical Correlations with continuous-domain Pauli Correlation Encoding
Vicente P. Soloviev, Bibhas Adhikari·Apr 7, 2026
We propose a quantum machine learning framework for estimating classical covariance matrices using parameterized quantum circuits within the Pauli-Correlation-Encoding (PCE) paradigm. We introduce two quantum covariance estimators: the C-Estimator, w...
Symmetry-resolved Krylov Complexity and the Uncoloured Tensor Model
Shaliya Kotta, P N Bala Subramanian·Apr 7, 2026
The symmetry-resolved Krylov complexity is a useful tool in studying chaotic properties of systems that are endowed with symmetries. We investigate the conditions under which an invariant operator would have the symmetry-resolved Krylov complexity in...
Estimation of trace distance between two arbitrary quantum states
Sanchita Ghosh, Anumita Mukhopadhyay, Anindita Bera +2 more·Apr 7, 2026
When it comes to discriminating between two quantum states, trace distance is one of the well-known metrics used in quantum computation and quantum information theory. While there are several quantum algorithms for calculating the trace distance betw...
Loss-aware state space geometry for quantum variational algorithms
Ankit Gill, Kunal Pal·Apr 7, 2026
The natural gradient descent optimisation technique is an efficient optimising protocol for broad classes of classical and quantum systems that takes the underlying geometry of the parameter manifold into account by means of using either the Fisher i...
A solid-state quantum memory based on a continuous optoacoustic system
Changlong Zhu, Claudiu Genes, Birgit Stiller·Apr 7, 2026
Quantum memories for optical states are essential resources for quantum communication and information processing. We propose a quantum memory protocol based on coherent photon-phonon transduction in a Brillouin-active optical waveguide supporting tra...
PQC-Enhanced QKD Networks: A Layered Approach
Paul Spooren, Andreas Neuhold, Sebastian Ramacher +1 more·Apr 7, 2026
We present a layered and modular network architecture that combines Quantum Key Distribution (QKD) and Post-Quantum Cryptography (PQC) to provide scalable end-to-end security across long distance multi-hop, trusted-node quantum networks. To ensure in...
Resource Implications of Different Encodings for Quantum Computational Fluid Dynamics
Hans A. Kösel, Roland Ewert, Jan W. Delfs·Apr 7, 2026
For quantum algorithms for problems in which the task is to compute an entire field of values, like e.g. computational fluid dynamics (CFD), it is often proposed amplitude encoding w.r.t. multiple qubits; however, the efforts implied by it for initia...
Quantum state determinability from local marginals is universally robust
Wenjun Yu, Fei Shi, Giulio Chiribella +1 more·Apr 7, 2026
A fundamental problem in quantum physics is to establish whether a multiparticle quantum state can be uniquely determined from its local marginals. In theory, this problem has been addressed in the exact case where the marginals are perfectly known. ...
Qurator: Scheduling Hybrid Quantum-Classical Workflows Across Heterogeneous Cloud Providers
Sinan Pehlivanoglu, Ulrik de Muelenaere, Peter Kogge +1 more·Apr 7, 2026
As quantum computing moves from isolated experiments toward integration with large-scale workflows, the integration of quantum devices into HPC systems has gained much interest. Quantum cloud providers expose shared devices through first-come first-s...
Mass generation in graphs
Ioannis Kleftogiannis, Ilias Amanatidis·Apr 7, 2026
We demonstrate a mechanism for the production of massive excitations in graphs. We treat the number of neighbors at each vertex in the graph (degree) as a scalar field. Then we introduce a mechanism inspired by the Higgs mechanism in quantum field th...
Non-Markovian exceptional points in waveguide quantum electrodynamics
Stefano Longhi·Apr 7, 2026
Spontaneous emission of a quantum emitter, such as an excited atom, is a fundamental process in quantum electrodynamics (QED), typically associated with exponential decay to the ground state accompanied by irreversible photon emission. This simple Ma...
Accelerating Quantum State Encoding with SIMD: Design, Implementation, and Benchmarking
Riza Alaudin Syah, Irwan Alnarus Kautsar, Gunawan Witjaksono +1 more·Apr 7, 2026
Efficient data encoding is the main factor affecting how fast hybrid quantum-classical algorithms run, but traditional simulators spend most of their time changing classical features into quantum rotations. This work introduces Hybriqu Encoder, a Rus...
Phase-Fidelity-Aware Truncated Quantum Fourier Transform for Scalable Phase Estimation on NISQ Hardware
Akoramurthy B, Surendiran. B·Apr 7, 2026
Quantum phase estimation~(QPE) is central to numerous quantum algorithms, yet its standard implementation demands an $\calO(m^{2})$-gate quantum Fourier transform~(QFT) on $m$ control qubits-a prohibitive overhead on near-term noisy intermediate-scal...
Another Triumph of Locality: Colliding Histories Skew Handshakes
Charles Alexandre Bédard·Apr 7, 2026
From gravity to electromagnetism, apparent action at a distance has always been resolved by deeper, local explanations. Yet today, Bell's theorem is widely interpreted as the death knell for local reality. In this chapter, I present the theorem in ac...
A Digital Spreading Framework for Quantum Expectation Computation Without Rotation Gates or Arithmetic Circuits
Yu-Ting Kao, Yeong-Jar Chang·Apr 7, 2026
In the pursuit of quantum advantage for financial engineering, researchers face a critical dilemma: analog rotation gates suffer from inherent 'sine-to-square' biases and error magnification, while digital arithmetic circuits (e.g., WeightedAdder) in...
Decoherence-induced Multiphoton Interference
Yifan Du, Jiuyi Zhang, Daniel López Martínez +2 more·Apr 7, 2026
Decoherence is usually deemed detrimental to quantum information processing. Its control and minimization require significant costs and operating overheads, constituting a major hurdle to commercialize quantum technology. Yet, quantum mechanics provi...
Granularity Noise Limit in Atomic-Ensemble-Based Metrology
Chen-Rong Liu, Chuang Li, Runxia Tao +4 more·Apr 7, 2026
Conventional noise analysis in atomic-ensemble sensing assumes a continuous-medium approximation, thereby treating the atomic system as a deterministic dielectric. Here, we demonstrate that this assumption breaks down due to the discrete, particulate...
Molecular Excited States using Quantum Subspace Methods: Accuracy, Resource Reduction, and Error-Mitigated Hardware Implementation of q-sc-EOM
Srivathsan Poyyapakkam Sundar, Prince Frederick Kwao, Alexey Galda +1 more·Apr 7, 2026
Problems in quantum chemical simulations, especially achieving accurate excited-state potential energy surfaces, are among the primary applications to achieve quantum utility. On near-term quantum hardware, variants of the variational quantum eigenso...
Entanglement in the open XX chain: Rényi oscillations, hard-edge crossover, and symmetry resolution
Miguel Tierz·Apr 7, 2026
We derive closed-form asymptotic formulas for the Rényi entanglement entropies of the open XX spin-$1/2$ chain by mapping the underlying determinant of the boundary correlation matrix (which has Toeplitz-plus-Hankel structure) to a Hankel determinant...