Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Metriq: A Collaborative Platform for Benchmarking Quantum Computers
Alessandro Cosentino, Changhao Li, Vincent Russo +6 more·Mar 9, 2026
The fragmented landscape of quantum computer benchmarks, characterized by system-specific tools and inconsistent evaluation methodologies, hinders reliable cross-platform performance assessment. We introduce Metriq, an open-source collaborative platf...
Quantization of Ricci Curvature in Information Geometry
Carlos C. Rodriguez·Mar 9, 2026
In 2004, while studying the information geometry of binary Bayesian networks (bitnets), the author conjectured that the volume-averaged Ricci scalar <R> computed with respect to the Fisher information metric is universally quantized to positive half-...
Characterization and upgrade of a quantum graph neural network for charged particle tracking
Matteo Argenton, Laura Cappelli, Concezio Bozzi·Mar 9, 2026
In the forthcoming years the LHC experiments are going to be upgraded to benefit from the substantial increase of the LHC instantaneous luminosity, which will lead to larger, denser events, and, consequently, greater complexity in reconstructing char...
Symmetry-based perturbation theory for electronic structure calculations
Hiromichi Nishimura, Nam Nguyen, Tanvi Gujarati +1 more·Mar 9, 2026
We develop a multi-reference perturbation theory for electronic structure calculations based on symmetries of the Hamiltonian. The reference Hamiltonian in the symmetry-based perturbation theory (SBPT) is chosen such that it possesses more symmetries...
Bias in Local Spin Measurements from Deformed Symmetries
Michele Arzano, Goffredo Chirco, Jerzy Kowalski-Glikman·Mar 9, 2026
We study bipartite spin-singlet correlations when rotational symmetry is described by a quantum group rather than an ordinary Lie group. We show that, even though the single-spin observables act as in the undeformed theory, the non-trivial coproduct ...
Communication-constrained nonlocal correlations
Lucas Pollyceno, Denis Freudenheim, José Nogueira +3 more·Mar 9, 2026
Identifying the physical grounds distinguishing quantum theory from broader probabilistic frameworks remains an open challenge. Communication-based proposals -- most notably the principles of impossibility of superluminal signaling and information ca...
Heterogeneously Integrated Diamond-on-Lithium Niobate Quantum Photonic Platform
Sophie W. Ding, Chang Jin, Zixi Li +9 more·Mar 9, 2026
Diamond photonics has enabled efficient interfaces for quantum memories and is predicted to be a critical component of quantum networks. However, scalable network architectures require spatial, temporal, and spectral control of photons, which relies ...
Quantum-limited estimation of the difference between photonic momenta via spatially resolved two-photon interference
Luca Maggio, Vincenzo Tamma·Mar 9, 2026
We present a quantum sensing protocol for three-dimensional estimation of the difference between the momenta of two photons based on spatially resolved interferometric sampling measurements. The protocol attains ultimate quantum precision in the simu...
Parity-dependent Casimir forces and Hall currents for a confined Dirac field
Aitor Fernández, César D. Fosco·Mar 9, 2026
We study a massless Dirac field subjected to two alternative boundary conditions on two parallel thin walls, in d + 1 dimensions. The two configurations correspond to the system being even or odd under reflection about the midplane between the two wa...
Gate Optimization via Efficient Two-Qubit Benchmarking for NV Centers in Diamond
Alessandro Marcomini, Philipp J. Vetter, Tommaso Calarco +3 more·Mar 9, 2026
High-fidelity gate implementation requires sophisticated control pulses that steer the quantum system to undergo the desired transformation. Quantum Optimal Control allows to derive these control pulses in an open-loop fashion based on numerical simu...
The Grasshopper Problem on the Sphere
David Llamas, Dmitry Chistikov, Adrian Kent +2 more·Mar 9, 2026
The spherical grasshopper problem is a geometric optimization problem that arises in the context of Bell inequalities and can be interpreted as identifying the best local hidden variable approximation to quantum singlet correlations for measurements ...
Microwave response of electrically driven spins in a three-qubit quantum processor
Tanner M. Janda, Heun Mo Yoo, Connor Nasseraddin +3 more·Mar 9, 2026
In electric dipole spin resonance (EDSR), a single spin is electrically driven in the field gradient produced by a micromagnet. While EDSR has enabled high fidelity gate operations in many devices, there are reports of unexpected non-linearities in t...
Space-sharing and Singleton Bounds for Entanglement-assisted Classical Coding
Yuhang Yao, Tushita Prasad, Markus Grassl +2 more·Mar 9, 2026
Recent work has noted that a space-sharing argument proves the tightness of the entropic quantum Singleton bounds, which was left open in the literature for various settings involving only-quantum messages, only-classical messages, or both classical ...
Extrapolative Quantum Error Mitigation in Continuous-Variable Systems beyond the Training Horizon
Jingpeng Zhang, Shengyong Li, Jie Han +3 more·Mar 9, 2026
Continuous-variable (CV) quantum systems provide a versatile platform for quantum information processing, in which quantum states can be represented in the quadrature phase space. In realistic implementations, environmental noise, primarily photon lo...
The robustness of composite pulses elucidated by classical mechanics. II. The role of initial state imperfection
Jonathan Berkheim, David J. Tannor·Mar 9, 2026
In nuclear magnetic resonance (NMR), Composite Pulses (CPs) are widely used to correct for pulse imperfections, e.g., RF field inhomogeneity and resonance offset. Although robust pulse sequences have been developed throughout the years, the imperfect...
Mid-Infrared Modulation of Quantum Emitters in Hexagonal Boron Nitride
Karin Yamamura, Xinyang Yu, Chaohao Chen +3 more·Mar 9, 2026
Single photon emitters (SPEs) are promising building blocks for practical devices in quantum technologies. Traditionally, these systems are excited using off-resonant visible light through their phonon transitions, yet this process remains poorly und...
The Transfer Tensor Method: an Analytical Study Case
Marcel Morillas-Rozas, Alberto López-García, Gonzalo Reina Rivero +2 more·Mar 9, 2026
The transfer tensor method is a versatile tool for analyzing and propagating general open quantum systems. It captures in a compact manner all memory effects in a non-Markovian system through a straightforward transformation of a set of dynamical map...
Stochastic Loop Corrections to Belief Propagation for Tensor Network Contraction
Gi Beom Sim, Tae Hyeon Park, Kwang S. Kim +6 more·Mar 9, 2026
Tensor network contraction is a fundamental computational challenge underlying quantum many-body physics, statistical mechanics, and machine learning. Belief propagation (BP) provides an efficient approximate solution, but introduces systematic error...
Distributed g(2) Retrieval with Atomic Clocks: Eliminating Conventional Sync Protocols
Md Mehdi Hassan, Jacob E. Humberd, Mohmad Junaid Ul Haq +3 more·Mar 9, 2026
We demonstrate a method to measure coincidences between polarization-entangled photons distributed to distant locations, eliminating traditional synchronization by employing a compact, chip-scale atomic clock for precise timing.
Experimental Realization of the Markov Chain Monte Carlo Algorithm on a Quantum Computer
Baptiste Claudon, Sergi Ramos-Calderer, Jean-Philip Piquemal·Mar 9, 2026
Quantum algorithms present a quadratically improved complexity over classical ones for certain sampling tasks. For instance, the Quantum Amplitude Estimation (QAE) algorithm promises to speedup the estimation of the mean of certain functions, given a...