Papers
Live trends in quantum computing research, updated daily from arXiv.
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Generative Decoding for Quantum Error-correcting Codes
Han-Yu Cao, Feng Pan, Dongyang Feng +2 more·Mar 27, 2025
Efficient and accurate decoding of quantum error-correcting codes is essential for fault-tolerant quantum computation, however, it is challenging due to the degeneracy of errors, the complex code topology, and the large space for logical operators in...
Fast and Noise-aware Machine Learning Variational Quantum Eigensolver Optimiser
Akib Karim, Shaobo Zhang, Muhammad Usman·Mar 26, 2025
The Variational Quantum Eigensolver (VQE) is a hybrid quantum-classical algorithm for preparing ground states in the current era of noisy devices. The classical component of the algorithm requires a large number of measurements on intermediate parame...
Filter-enhanced adiabatic quantum computing on a digital quantum processor
Erenay Karacan, Conor Mc Keever, M. Foss-Feig +2 more·Mar 26, 2025
Eigenstate filters underpin near-optimal quantum algorithms for ground state preparation. Their realization on current quantum computers, however, poses a challenge as the filters are typically represented by deep quantum circuits. Additionally, sinc...
A Multilevel Framework for Partitioning Quantum Circuits
Felix Burt, Kuan-Cheng Chen, Kin K. Leung·Mar 24, 2025
Executing quantum algorithms over distributed quantum systems requires quantum circuits to be divided into sub-circuits which communicate via entanglement-based teleportation. Naively mapping circuits to qubits over multiple quantum processing units ...
Almost device-independent calibration beyond Born’s rule: Bell tests for cross-talk detection
G. Tabia, A. Shih, Jin-Yuan Zheng +1 more·Mar 24, 2025
In quantum information, device-independent (DI) protocols offer a new approach to information processing tasks, making minimal assumptions about the devices used. Typically, since these protocols draw conclusions directly from the data collected in a...
Approximate Quantum Error Correction with 1D Log-Depth Circuits
Guoding Liu, Zhenyu Du, Zi-Wen Liu +1 more·Mar 22, 2025
Efficient and high-performance quantum error correction is essential for achieving fault-tolerant quantum computing. Low-depth random circuits offer a promising approach to identifying effective and practical encoding strategies. In this work, we rig...
Criteria for unbiased estimation: applications to noise-agnostic sensing and learnability of quantum channel
Hyukgun Kwon, Kento Tsubouchi, Chia-Tung Chu +1 more·Mar 21, 2025
We establish the necessary and sufficient conditions for unbiased estimation in multi-parameter estimation tasks. More specifically, we first consider quantum state estimation, where multiple parameters are encoded in a quantum state, and derive simp...
On the Importance of Error Mitigation for Quantum Computation
D. Aharonov, O. Alberton, I. Arad +13 more·Mar 21, 2025
Quantum error mitigation (EM) is a family of hybrid quantum-classical methods for eliminating or reducing the effect of noise and decoherence on quantum algorithms run on quantum hardware, without applying quantum error correction (EC). While EM has ...
Quantum Characterization, Verification, and Validation
R. Blume-Kohout, Timothy Proctor, Kevin Young·Mar 20, 2025
Quantum characterization, verification, and validation (QCVV) is a set of techniques to probe, describe, and assess the behavior of quantum bits (qubits), quantum information-processing registers, and quantum computers. QCVV protocols probe and descr...
Explaining Robust Quantum Metrology by Counting Codewords
Oskar Novak, Narayanan Rengaswamy·Mar 19, 2025
Quantum sensing holds great promise for high-precision magnetic field measurements. However, its performance is significantly limited by noise. The investigation of active quantum error correction to address this noise led to the Hamiltonian-Not-in-L...
The source of hardware-tailored codes and coding phases
Gaurav Gyawali, Henry Shackleton, Zhu-Xi Luo +1 more·Mar 19, 2025
A central challenge in quantum error correction is identifying powerful quantum codes tailored to specific hardware and determining their error thresholds above which quantum information is unprotected. This problem is hard because we cannot determin...
Absolutely Maximal Entanglement in Continuous Variables
James I. Kwon, A. J. Brady, Victor V. Albert·Mar 19, 2025
We explore absolutely maximal entanglement (AME) and k-uniformity in continuous-variable (CV) quantum systems, and show that-unlike in qudit systems-such entanglement is readily realizable in both Gaussian and non-Gaussian quantum states of multiple ...
Degenerate mirrorless lasing in thermal vapors
Aneesh Ramaswamy, Dmitry Budker, Simon Rochester +5 more·Mar 18, 2025
Theoretical predictions were made for the steady-state gain of an orthogonally polarized probe field in a degenerate two-level alkali atom system driven by a linearly polarized continuous-wave pump field in [Opt. Mem. Neural Networks 32 (Suppl 3), S4...
QuGStep: Refining step size selection in gradient estimation for variational quantum algorithms
Senwei Liang, Linghua Zhu, Xiaosong Li +1 more·Mar 18, 2025
Variational quantum algorithms (VQAs) offer a promising approach to solving computationally demanding problems by combining parameterized quantum circuits with classical optimization. Estimating probabilistic outcomes on quantum hardware requires rep...
Refined Criteria for QRAM Error Suppression via Efficient Large-Scale QRAM Simulator
Yun-Jie Wang, Tai-Ping Sun, Xi-Ning Zhuang +6 more·Mar 18, 2025
Quantum random access memory (QRAM) is a critical primitive for quantum algorithms that require data lookup in superposition, but its lack of fault tolerance poses a major obstacle to practical deployment. Error filtration (EF) has been proposed as a...
Scalability challenges in variational quantum optimization under stochastic noise
Adelina Bärligea, Benedikt Poggel, Jeanette Miriam Lorenz·Mar 18, 2025
With rapid advances in quantum hardware, a central question is whether quantum devices with or without full error correction can outperform classical computers on practically relevant problems. Variational quantum algorithms (VQAs) have gained signif...
Quantum Dynamics Simulation of the Advection-Diffusion Equation
Hirad Alipanah, Feng Zhang, Yongxin Yao +6 more·Mar 17, 2025
The advection-diffusion equation is simulated on a superconducting quantum computer via several quantum algorithms. Three formulations are considered: (1) Trotterization, (2) variational quantum time evolution (VarQTE), and (3) adaptive variational q...
Decoherence from quantum spacetime noise: An open-systems framework with application to neutrino oscillations
Partha Nandi, Tiasha Bhattacharyya, A. S. Majumdar +2 more·Mar 17, 2025
We present a general open-quantum-systems framework to model decoherence induced by stochastic Planck-scale fluctuations of spacetime, focusing on the kappa-Minkowski noncommutative geometry as a representative quantum-gravity scenario. Treating the ...
Low-Overhead Tailoring and Learning of Noise in Graph States
Guedong Park, Jinzhao Sun, Hyunseok Jeong·Mar 17, 2025
Graph and hypergraph states are important resource states for realizing universal quantum computation and diverse non-local physical phenomena. However, noise learning in such states is challenging due to their large entanglement and magic. This work...
Scalable Robust Quantum Control for Semiconductor Spin Qubits with Always-on Couplings
Yong-Ju Hai, Shihang Zhang, Hao-Yu Guan +3 more·Mar 17, 2025
We demonstrate a robust quantum control framework that enables high-fidelity gate operations in semiconductor spin qubit systems with always-on couplings. Always-on interactions between qubits pose a fundamental challenge for quantum processors by in...