Papers
Live trends in quantum computing research, updated daily from arXiv.
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Deterministic Fault-Tolerant State Preparation for Near-Term Quantum Error Correction: Automatic Synthesis Using Boolean Satisfiability
Ludwig Schmid, Tom Peham, Lucas Berent +2 more·Jan 9, 2025
To ensure resilience against the unavoidable noise in quantum computers, quantum information needs to be encoded using an error-correcting code, and circuits must have a particular structure to be fault-tolerant. Compilation of fault-tolerant quantum...
Lattice surgery realized on two distance-three repetition codes with superconducting qubits
Ilya Besedin, Michael Kerschbaum, Jonathan Knoll +12 more·Jan 8, 2025
Quantum error correction is needed for quantum computers to be capable of executing algorithms using hundreds of logical qubits in a fault-tolerant manner. Recent experiments have progressed towards this by demonstrating sufficiently low error rates ...
Evolved Quantum Boltzmann Machines
Michele Minervini, Dhrumil Patel, Mark M. Wilde·Jan 6, 2025
We introduce evolved quantum Boltzmann machines as a variational ansatz for quantum optimization and learning tasks. Given two parameterized Hamiltonians $G(θ)$ and $H(φ)$, an evolved quantum Boltzmann machine consists of preparing a thermal state of...
Characterizing quantum dynamics using multipartite entanglement generation
Gaurav Rudra Malik, Rohit Kumar Shukla, S. Aravinda +1 more·Jan 6, 2025
Entanglement is a defining feature of many-body quantum systems and is an essential requirement for quantum computing. It is therefore useful to study physical processes which generate entanglement within a large system, as they maybe replicated for ...
Experimental simulation of postselected closed timelike curves for decoding scrambled quantum information
Yi-Te Huang, Hsiang-Wei Huang, Jhen-Dong Lin +5 more·Jan 4, 2025
Quantum information scrambling (QIS) describes the rapid spread of initially localized information across an entire quantum many-body system through entanglement generation. Once scrambled, the original local information becomes encoded globally, ina...
Detecting high-dimensional entanglement by randomized product projections
Jin-Min Liang, Shuheng Liu, Shao-Ming Fei +1 more·Jan 2, 2025
The characterization of high-dimensional entanglement plays a crucial role in the field of quantum information science. Conventional entanglement criteria measuring coherent superpositions of multiple basis states face experimental bottlenecks on mos...
Efficient estimation and sequential optimization of cost functions in variational quantum algorithms
Muhammad Umer, Eleftherios Mastorakis, D. Angelakis·Dec 30, 2024
Classical optimization is a cornerstone of the success of variational quantum algorithms, which often require determining the derivatives of the cost function relative to variational parameters. The computation of the cost function and its derivative...
Quantum error correction near the coding theoretical bound
Daiki Komoto, Kenta Kasai·Dec 30, 2024
Recent progress in quantum computing has enabled systems with tens of reliable logical qubits, built from thousands of noisy physical qubits1. However, many impactful applications demand quantum computations with millions of logical qubits2, necessit...
The surface code beyond Pauli channels: Logical noise coherence, information-theoretic measures, and errorfield-double phenomenology
Jan Behrends, Benjamin B'eri·Dec 30, 2024
We consider the surface code under errors featuring both coherent and incoherent components and study the coherence of the corresponding logical noise channel and how this impacts information-theoretic measures of code performance, namely coherent in...
Efficient evaluation of optical quantum modules via two-photon high-dimensional interference.
Xiaoqian Zhang, Maolin Luo, Xiaoqi Zhou·Dec 28, 2024
The rapid advancement of quantum information technology has increased the demand for precise testing and calibration of quantum modules, especially in optical quantum circuits where module reliability directly impacts system performance. To address t...
An experimental proposal certification for any three-qubit generalized Greenberger-Horne-Zeilinger states based on the fine-grained steering inequality
Zhihao Bian, Jia-qi Sun, Yi Shen·Dec 26, 2024
Multi-party quantum steering is an important concept in quantum information theory and quantum mechanics, typically related to quantum entanglement and quantum nonlocality. It enables precise manipulation of large quantum systems, which is essentia...
Simple Quantum Gradient Descent Without Coherent Oracle Access
Nhat A. Nghiem·Dec 24, 2024
The gradient descent method aims at finding local minima of a given multivariate function by moving along the direction of its gradient, and hence, the algorithm typically involves computing all partial derivatives of a given function, before updatin...
Variational quantum state diagonalization with computational-basis probabilities
Juan Yao·Dec 24, 2024
In this report, we propose a novel quantum diagonalization algorithm based on the optimization of variational quantum circuits. Diagonalizing a quantum state is a fundamental yet computationally challenging task in quantum information science, especi...
Quantum simulation of Burgers turbulence: Nonlinear transformation and direct evaluation of statistical quantities
Fumio Uchida, Koichi Miyamoto, Soichiro Yamazaki +2 more·Dec 23, 2024
Fault-tolerant quantum computing is a promising technology to solve linear partial differential equations that are classically demanding to integrate. It is still challenging to solve non-linear equations in fluid dynamics, such as the Burgers equati...
On-chip frequency-bin quantum photonics
K. Myilswamy, L. Cohen, Suparna Seshadri +2 more·Dec 23, 2024
Abstract Frequency-bin encoding furnishes a compelling pathway for quantum information processing systems compatible with established lightwave infrastructures based on fiber-optic transmission and wavelength-division multiplexing. Yet although signi...
Distribution-Adaptive Dynamic Shot Optimization for Variational Quantum Algorithms
Youngmin Kim, Enhyeok Jang, Hyungseok Kim +6 more·Dec 23, 2024
Variational quantum algorithms (VQAs) have attracted remarkable interest over the past few years because of their potential computational advantages on near-term quantum devices. They leverage a hybrid approach that integrates classical and quantum c...
A dynamical algebra of protocol-induced transformations on Dicke states
Pierre-Antoine Bernard, L. Vinet·Dec 23, 2024
Quantum $n$-qubit states that are totally symmetric under the permutation of qubits are essential ingredients of important algorithms and applications in quantum information. Consequently, there is significant interest in developing methods to prepar...
Quantum $(r,δ)$-locally recoverable codes
Carlos Galindo, Fernando Hernando, Helena Martín-Cruz +1 more·Dec 21, 2024
Classical $(r,δ)$-locally recoverable codes are designed for avoiding loss of information in large scale distributed and cloud storage systems. We introduce the quantum counterpart of those codes by defining quantum $(r,δ)$-locally recoverable codes ...
Fundamental Thresholds for Computational and Erasure Errors via the Coherent Information
Luis Colmenarez, Seyong Kim, Markus Müller·Dec 21, 2024
Quantum error correcting (QEC) codes protect quantum information against environmental noise. Computational errors caused by the environment change the quantum state within the qubit subspace, whereas quantum erasures correspond to the loss of qubi...
Simulating Three-Flavor Neutrino Oscillations on an NMR Quantum Processor
Gayatri Singh, Arvind, K. Dorai·Dec 20, 2024
Neutrino oscillations can be efficiently simulated on a quantum computer using the Pontecorvo-Maki-Nakagawa-Sakata (PMNS) theory in close analogy to the physical processes realized in experiments. We simulate three-flavor neutrino oscillations on a t...