Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Empty-Signal Detection and the Principle-Level Feasibility of Arbitrarily Long-Distance Repeaterless Quantum Communication
Hao Shu·Sep 19, 2025
Practical repeaterless quantum communication (PRQC) is fundamentally constrained by the divergence of the quantum bit error rate (QBER) arising from the interplay between channel loss and single-photon detector (SPD) dark counts. As the channel trans...
Formation of Cavity-Polaritons via High-Order Van Hove Singularities
Igor Gianardi, Michele Pini, Francesco Piazza·Sep 19, 2025
We consider polaritons formed by hybridizing particle-hole excitations of an insulating phase with a cavity photon at sub-gap frequencies, where absorption is suppressed. The strength of the hybridization is driven by the Van Hove singularity in the ...
Single-shot sorting of Mössbauer time-domain data at X-ray free-electron lasers
Miriam Gerharz, Willi Hippler, Berit Marx-Glowna +28 more·Sep 19, 2025
Mössbauer spectroscopy is widely used to study structure and dynamics of matter with remarkably high energy resolution, provided by the narrow nuclear resonance line widths. However, the narrow width implies low count rates, such that experiments com...
A heat-resilient hole spin qubit in silicon
V. Champain, G. Boschetto, H. Niebojewski +12 more·Sep 19, 2025
Recent advances in scaling up spin-based quantum processors have revealed unanticipated issues related to thermal effects. Microwave pulses required to manipulate and read the qubits are found to overheat the spins environment, which unexpectedly ind...
The basic ideas of quantum mechanics
David Ellerman·Sep 19, 2025
For a century, quantum theorists have been reading the mathematical entrails of quantum mechanics (QM) to divine the nature of quantum reality. But to little avail. In this paper a different approach is taken, namely to identify and explain the basic...
Products between block-encodings
Dekuan Dong, Yingzhou Li, Jungong Xue·Sep 19, 2025
Block-encoding is a standard framework for embedding matrices into unitary operators in quantum algorithms. Efficient implementation of products between block-encoded matrices is crucial for applications such as Hamiltonian simulation and quantum lin...
Gaussian fermionic embezzlement of entanglement
Alessia Kera, Lauritz van Luijk, Alexander Stottmeister +1 more·Sep 19, 2025
Embezzlement of entanglement allows to extract arbitrary entangled states from a suitable embezzling state using only local operations while perturbing the resource state arbitrarily little. A natural family of embezzling states is given by ground st...
Task-Oriented Gaussian Optimization for Non-Gaussian Resources in Continuous-Variable Quantum Computation
Boxuan Jing, Feng-Xiao Sun, Qiongyi He·Sep 19, 2025
In continuous-variable systems, non-Gaussian resources are essential for achieving universal quantum computation that lies beyond classical simulation. Among the candidate states, the cubic phase state stands out as the simplest form of single-mode n...
CLASS: A Controller-Centric Layout Synthesizer for Dynamic Quantum Circuits
Yu Chen, Yilun Zhao, Bing Li +4 more·Sep 19, 2025
Layout Synthesis for Quantum Computing (LSQC) is a critical component of quantum design tools. Traditional LSQC studies primarily focus on optimizing for reduced circuit depth by adopting a device-centric design methodology. However, these approaches...
Training Variational Quantum Circuits Using Particle Swarm Optimization
Marco Mordacci, Michele Amoretti·Sep 19, 2025
In this work, the Particle Swarm Optimization (PSO) algorithm has been used to train various Variational Quantum Circuits (VQCs). This approach is motivated by the fact that commonly used gradient-based optimization methods can suffer from the barren...
Impact of Single Rotations and Entanglement Topologies in Quantum Neural Networks
Marco Mordacci, Michele Amoretti·Sep 19, 2025
In this work, an analysis of the performance of different Variational Quantum Circuits is presented, investigating how it changes with respect to entanglement topology, adopted gates, and Quantum Machine Learning tasks to be performed. The objective ...
Hamiltonian learning via quantum Zeno effect
Giacomo Franceschetto, Egle Pagliaro, Luciano Pereira +2 more·Sep 19, 2025
Determining the Hamiltonian of a quantum system is essential for understanding its dynamics and validating its behavior. Hamiltonian learning provides a data-driven approach to reconstruct the generator of the dynamics from measurements on the evolve...
Qubit-oscillator-based gate implementations for approximate Gottesman-Kitaev-Preskill codes
Lukas Brenner, Beatriz Dias, Robert Koenig·Sep 19, 2025
We consider hybrid qubit-oscillator systems together with Gaussian, multi-qubit as well as qubit-controlled Gaussian unitaries. We propose implementations of logical gates for approximate Gottesman-Kitaev-Preskill codes in this model using two oscill...
Triplet Loss Based Quantum Encoding for Class Separability
Marco Mordacci, Mahul Pandey, Paolo Santini +1 more·Sep 19, 2025
An efficient and data-driven encoding scheme is proposed to enhance the performance of variational quantum classifiers. This encoding is specially designed for complex datasets like images and seeks to help the classification task by producing input ...
Robust self-testing of quantum steering assemblages via operator inequalities
Beata Zjawin·Sep 19, 2025
Robust self-testing provides a framework for certifying quantum resources under experimental imperfections. Improving robustness bounds for quantum resources such as quantum states, steering assemblages, and measurements is a constant effort that ens...
Photon Blockade Mediated by Two-Photon Absorption in an Optical Parametric Amplifier
Weiyi An, Jie Zhu·Sep 19, 2025
Photon blockade (PB) is a quantum effect in strongly nonlinear systems where a single photon prevents the system from being excited to a higher level, generating anti-bunched light fields. It enables the generation of single-photon sources for quantu...
Rational Quantum Mechanics: Testing Quantum Theory with Quantum Computers
Tim Palmer·Sep 19, 2025
Motivated in part by John Wheeler's assertion that the continuum nature of Hilbert Space conceals the `it-from-bit' information-theoretic character of the quantum wavefunction, a theory of quantum physics (Rational Quantum Mechanics - RaQM) is propos...
Bose's Probabilistic Interactions, Einstein's Objections, and Their Legacy in Quantum Optics and Stochastic Mechanics
Partha Ghose·Sep 19, 2025
In 1924, S. N. Bose proposed (i) a new counting method for photons and (ii) a probabilistic law of microscopic matter-radiation interactions, treating emission and absorption as two aspects of a single, field-dependent process. While Einstein enthusi...
Measurement-Driven Transitions between Area Law Phases
Hui Yu, Jiangping Hu·Sep 19, 2025
In recent years, quantum circuits consisting of unitary gates and projective measurements have become valuable tools for stimulating or preparing quantum many-body states with non-trivial properties. Here, we introduce and examine a measurement-only ...
QuantEM: The quantum error management compiler
Ji Liu, Quinn Langfitt, Mingyoung Jessica Jeng +7 more·Sep 19, 2025
As quantum computing advances toward fault-tolerant architectures, quantum error detection (QED) has emerged as a practical and scalable intermediate strategy in the transition from error mitigation to full error correction. By identifying and discar...