Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Quantum squeezing amplification with a weak Kerr nonlinear oscillator
Yanyan Cai, Xiaowei Deng, Libo Zhang +8 more·Mar 11, 2025
Quantum squeezed states, with biased quantum noise, have been widely utilized in quantum sensing and quantum error correction applications. However, generating and manipulating these nonclassical states with a large squeezing degree typically require...
Quantum error corrected non-Markovian metrology
Z. Mann, Ningping Cao, Raymond Laflamme +1 more·Mar 10, 2025
Quantum metrology aims to maximize measurement precision on quantum systems, with a wide range of applications in quantum sensing. Achieving the Heisenberg limit (HL) - the fundamental precision bound set by quantum mechanics - is often hindered by n...
Noise-Robust Estimation of Quantum Observables in Noisy Hardware
Amin Hosseinkhani, Fedor Šimkovic, Alessio Calzona +6 more·Mar 9, 2025
Error mitigation is essential for extracting reliable results from quantum computations performed on noisy intermediate-scale quantum hardware. Here we introduce Noise-Robust Estimation (NRE), a noise-agnostic framework that suppresses estimation bia...
An accurate and efficient analytic model of fidelity under depolarizing noise oriented to large scale quantum system design
Pau Escofet, Santiago Rodrigo, Artur Garcia-S'aez +3 more·Mar 9, 2025
Fidelity is one of the most valuable and commonly used metrics for assessing the performance of quantum circuits on error-prone quantum processors. Several approaches have been proposed to estimate circuit fidelity without executing it on quantum har...
Distributed quantum algorithm for the dihedral hidden subgroup problem
Peng-Ze Yang, Xin Zhang, Song Lin·Mar 9, 2025
To address the issue of excessive quantum resource requirements in Kuperberg's algorithm for the dihedral hidden subgroup problem, this paper proposes a distributed algorithm based on the function decomposition. By splitting the original function int...
Digital Zero-Noise Extrapolation with Quantum Circuit Unoptimization
Elijah Pelofske, Vincent Russo·Mar 8, 2025
Quantum circuit unoptimization is an algorithm that transforms a quantum circuit into a different circuit that uses more gate operations while maintaining the same unitary transformation. We demonstrate that this method can implement digital zero-noi...
HIVQE: Handover Iterative Variational Quantum Eigensolver for Efficient Quantum Chemistry Calculations
Aidan Pellow-Jarman, Shane McFarthing Doo, Hyung Kang +6 more·Mar 8, 2025
A novel hybrid quantum-classical approach has been developed to efficiently address the multireference quantum chemistry problem. The Handover Iterative Variational Quantum Eigensolver (HiVQE) is designed to accurately estimate ground-state wavefunct...
Implementation and verification of coherent error suppression using randomized compiling for Grover's algorithm on a trapped-ion device
Masatoshi Ishii, Hammam Qassim, Tomochika Kurita +4 more·Mar 7, 2025
In near-term quantum computations that do not employ error correction, noise can proliferate rapidly, corrupting the quantum state and making results unreliable. These errors originate from both decoherence and control imprecision. The latter can man...
Fast and memory-efficient strong simulation of noisy adaptive linear optical circuits
Timothée Goubault de Brugière, Nicolas Heurtel·Mar 7, 2025
Exactly computing the full output distribution of linear optical circuits remains a challenge, as existing methods are either time-efficient but memory-intensive or memory-efficient but slow. Moreover, any realistic simulation must account for noise,...
Quantum Decoherence of Nitrogen‐Vacancy Spin Ensembles in a Nitrogen Spin Bath in Diamond Under Dynamical Decoupling
Huijin Park, M. Onizhuk, Eunsang Lee +6 more·Mar 7, 2025
The negatively charged nitrogen‐vacancy (NV) center in diamond has emerged as a leading qubit platform. One of the key challenges for NV‐based quantum applications is building an accurate model to predict their decoherence properties. In this study, ...
Geometric quantum control and the random Schrödinger equation
Rufus Lawrence, Aleš Wodecki, Johannes Aspman +2 more·Mar 6, 2025
Understanding and mitigating noise in quantum systems is a fundamental challenge in achieving scalable and fault-tolerant quantum computation. Error modeling for quantum systems can be formulated in many ways, some of which are very fundamental, but ...
Interpolation-based coordinate descent method for parameterized quantum circuits
Zhijian Lai, Jiang Hu, Taehee Ko +2 more·Mar 6, 2025
Parameterized quantum circuits (PQCs) are fundamental to many hybrid quantum-classical algorithms. However, existing structure-based optimizers for the training of PQCs, such as Rotosolve and sequential minimal optimization, rely on heuristic node se...
Surface Code Error Correction with Crosstalk Noise
Zeyuan Zhou, A. Ji, Yongshan Ding·Mar 6, 2025
The design and performance analysis of quantum error correction (QEC) codes are often based on incoherent and independent noise models since it is easy to simulate. However, these models fail to capture realistic hardware noise sources, such as corre...
Entanglement Transitions in Noisy Quantum Circuits on Trees
V. Ravindranath, Yiqiu Han, Xiao Chen·Mar 6, 2025
Decoherence is ubiquitous, and poses a significant impediment to the observation of quantum phenomena, such as the measurement-induced entanglement phase transition (MIPT). In this work, we study entanglement transitions in quantum circuits on trees,...
Construction and Decoding of Quantum Margulis Codes
Michele Pacenti, Dimitris Chytas, Bane V. Vasic·Mar 5, 2025
Quantum low-density parity-check codes are a promising approach to fault-tolerant quantum computation, offering potential advantages in rate and decoding efficiency. In this work, we introduce quantum Margulis codes, a new class of QLDPC codes derive...
Logical Operations with a Dynamical Qubit in Floquet-Bacon-Shor Code.
Xuandong Sun, Longcheng Li, Zhiyi Wu +29 more·Mar 5, 2025
Quantum error correction (QEC) protects quantum systems against inevitable noises and control inaccuracies, providing a pathway toward fault-tolerant (FT) quantum computation. Stabilizer codes, including surface code and color code, have long been th...
Practical Unclonable Encryption with Continuous Variables
Arpan Akash Ray, Boris Škorić·Mar 4, 2025
We propose the first continuous-variable (CV) unclonable encryption scheme, extending the paradigm of quantum encryption of classical messages (QECM) to CV systems. In our construction, a classical message is first encrypted classically and then enco...
Spike-based alignment learning solves the weight transport problem
Timo Gierlich, Andreas Baumbach, Akos F. Kungl +2 more·Mar 4, 2025
In both machine learning and in computational neuroscience, plasticity in functional neural networks is frequently expressed as gradient descent on a cost. Often, this imposes symmetry constraints that are difficult to reconcile with local computatio...
Efficient Quantum Chemistry Calculations on Noisy Quantum Hardware
Nora M. Bauer, Kubra Yeter-Aydeniz, G. Siopsis·Mar 4, 2025
A hardware‐efficient optimization scheme is presented for quantum chemistry calculations, utilizing the Sampled Quantum Diagonalization (SQD) method. This algorithm, optimized SQD (SQDOpt), combines the classical Davidson method technique with added ...
rf-SQUID-based traveling-wave parametric amplifier with -84 dBm input saturation power across more than one octave bandwidth
Victor Gaydamachenko, Christoph Kissling, L. Grunhaupt·Mar 4, 2025
Traveling-wave parametric amplifiers (TWPAs) have become an essential tool for the readout of quantum circuits and the search for dark matter. We report on the implementation of an rf-SQUID-based Josephson TWPA with an average saturation power of -84...