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Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Polynomial time constructive decision algorithm for multivariable quantum signal processing
Yuki Ito, Hitomi Mori, Kazuki Sakamoto +1 more·Oct 3, 2024
Quantum signal processing (QSP) and quantum singular value transformation (QSVT) have provided a unified framework for understanding many quantum algorithms, including factorization, matrix inversion, and Hamiltonian simulation. As a multivariable ve...
MQT Qudits: A Software Framework for Mixed-Dimensional Quantum Computing
Kevin Mato, M. Ringbauer, Lukas Burgholzer +1 more·Oct 3, 2024
Quantum computing holds great promise for surpassing the limits of classical devices in many fields. Despite impressive developments, however, current research is primarily focused on qubits. At the same time, quantum hardware based on multi-level, q...
Quantum-data-driven dynamical transition in quantum learning
Bingzhi Zhang, Junyu Liu, Liang Jiang +1 more·Oct 2, 2024
Quantum neural networks, parameterized quantum circuits optimized under a specific cost function, provide a paradigm for achieving near-term quantum advantage in quantum information processing. Understanding QNN training dynamics is crucial for optim...
Low-depth Amplitude Estimation without Really Trying
Dinh-Long Vu, Bin Cheng, P. Rebentrost·Oct 2, 2024
Standard quantum amplitude estimation algorithms provide quadratic speedup to Monte-Carlo simulations but require a circuit depth that scales as inverse of the estimation error. In view of the shallow depth in near-term devices, the precision achieve...
Monte Carlo Simulation of Operator Dynamics and Entanglement in Dual-Unitary Circuits
M. Song, Z. Zeng, Ting-Tung Wang +3 more·Oct 1, 2024
We investigate operator dynamics and entanglement growth in dual-unitary circuits, a class of locally scrambled quantum systems that enables efficient simulation beyond the exponential complexity of the Hilbert space. By mapping the operator evolutio...
Edge Intelligence in Satellite-Terrestrial Networks With Hybrid Quantum Computing
Siyue Huang, Lifeng Wang, Xin Wang +3 more·Sep 30, 2024
This letter exploits the potential of edge intelligence empowered satellite-terrestrial networks, where users’ computation tasks are offloaded to the satellites or terrestrial base stations. The computation task offloading in such networks involves t...
Floquet evolution of the q-deformed \texorpdfstring{SU(3)${}_1$}{SU(3)1} Yang-Mills theory on a two-leg ladder
Tomoya Hayata, Yoshimasa Hidaka·Sep 30, 2024
We simulate Floquet time-evolution of a truncated SU(3) lattice Yang-Mills theory on a two-leg ladder geometry under open boundary conditions using IBM's superconducting 156-qubit device ibm\_fez. To this end, we derive the quantum spin representatio...
Fault-Tolerant Belief Propagation for Practical Quantum Memory
Kao-Yueh Kuo, Ching-Yi Lai·Sep 27, 2024
A fault-tolerant approach to reliable quantum memory is essential for scalable quantum computing, as physical qubits are susceptible to noise. Quantum error correction (QEC) must be continuously performed to prolong the memory lifetime. In QEC, error...
Subspace preserving quantum convolutional neural network architectures
Léo Monbroussou, Jonas Landman, Letao Wang +2 more·Sep 27, 2024
Subspace preserving quantum circuits are a class of quantum algorithms that, relying on some symmetries in the computation, can offer theoretical guarantees for their training. Those algorithms have gained extensive interest as they can offer polynom...
MG-Net: Learn to Customize QAOA with Circuit Depth Awareness
Yan Qian, Xinbiao Wang, Yuxuan Du +2 more·Sep 27, 2024
Quantum Approximate Optimization Algorithm (QAOA) and its variants exhibit immense potential in tackling combinatorial optimization challenges. However, their practical realization confronts a dilemma: the requisite circuit depth for satisfactory per...
Unveiling Hidden Vulnerabilities in Quantum Systems by Expanding Attack Vectors through Heisenberg's Uncertainty Principle
José R. Rosas-Bustos, J. The, Roydon Fraser·Sep 27, 2024
This paper identifies theoretical vulnerabilities in quantum integrity verification by demonstrating that Bell inequality (BI) violations, central to the detection of quantum entanglement, can align with predictions from hidden variable theories (HVT...
Exponential separation in quantum query complexity of the quantum switch with respect to simulations with standard quantum circuits
Hl'er Kristj'ansson, Tatsuki Odake, Satoshi Yoshida +4 more·Sep 27, 2024
Quantum theory is consistent with a computational model permitting black-box operations to be applied in an indefinite causal order, going beyond the standard circuit model of computation. The quantum switch -- the simplest such example -- has been s...
A probabilistic imaginary-time evolution quantum algorithm for advection-diffusion equation: Explicit gate-level implementation and comparisons to quantum linear system algorithms
Xinchi Huang, Hirofumi Nishi, Taichi Kosugi +2 more·Sep 27, 2024
Simulating differential equations on classical computers becomes an intractable problem if the grid size is extremely large. Quantum computers are believed to achieve a possibly exponential speedup in the matrix operation. In this paper, we propose a...
Theory and simulations of few-photon Fock state pulses strongly interacting with a single qubit in a waveguide: exact population dynamics and time-dependent spectra
S. Regidor, Andreas Knorr, Stephen Hughes·Sep 27, 2024
We present a detailed quantum theory and simulations of a few-photon Fock state pulse interacting with a two-level system (TLS) in a waveguide. For a rectangular pulse shape, we present an exact temporal scattering theory for the waveguide-QED system...
Simulating the quantum switch with quantum circuits is computationally hard
Jessica Bavaresco, Hlér Kristjánsson, Mio Murao +4 more·Sep 26, 2024
Higher-order transformations acting on input quantum channels in an indefinite causal order, such as the quantum switch, cannot be described by quantum circuits using the same number of calls to the input channels. A natural question is whether they ...
Optimal Quantum Purity Amplification
Zhaoyi Li, Honghao Fu, Takuya Isogawa +2 more·Sep 26, 2024
Quantum purity amplification (QPA) provides a novel approach to counteracting the pervasive noise that degrades quantum states. We present the optimal QPA protocol for general quantum systems and global noise, resolving a two-decade open problem. Und...
Loop Algorithm for Quantum Transverse Ising Model in a Longitudinal Field
Wei Xu, Xue-Feng Zhang·Sep 26, 2024
The quantum transverse Ising model and its extensions play a critical role in various fields, such as statistical physics, quantum magnetism, quantum simulations, and mathematical physics. Although it does not suffer from the sign problem in most cas...
QuForge: A Library for Qudits Simulation
Tiago de Souza Farias, Lucas Friedrich, Jonas Maziero·Sep 26, 2024
Quantum computing with qudits, an extension of qubits to multiple levels, is a research field less mature than qubit-based quantum computing. However, qudits can offer some advantages over qubits, by representing information with fewer separated comp...
Digital simulation of zero-temperature spontaneous symmetry breaking in a superconducting lattice processor
Chang-Kang Hu, Guixu Xie, Kasper Poulsen +11 more·Sep 26, 2024
Quantum simulators are ideal platforms to investigate quantum phenomena that are inaccessible through conventional means, such as the limited resources of classical computers to address large quantum systems or due to constraints imposed by fundament...
Non-stabilizerness Entanglement Entropy: a measure of hardness in the classical simulation of quantum many-body systems
Jiale Huang, Xiangjian Qian, Mingpu Qin·Sep 25, 2024
Classical and quantum states can be distinguished by entanglement entropy, which can be viewed as a measure of quantum resources. Entanglement entropy also plays a pivotal role in understanding computational complexity in simulating quantum systems. ...