Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Asymptotic Error Bounds and Fractional-Bit Design for Fixed-Point Grover's Quantum Algorithm Emulation
Seonghyun Choi, Kyeongwon Lee, Jongin Choi +1 more·Apr 2, 2025
Quantum computing (QC) emulators, which simulate quantum algorithms on classical hardware, are indispensable platforms for testing quantum algorithms before scalable quantum computers become widely available. A critical challenge in QC emulation is m...
Scalable Equivalence Checking and Verification of Shallow Quantum Circuits
Nengkun Yu, Xuan Du Trinh, Thomas Reps·Apr 2, 2025
This paper concerns the problem of checking whether two shallow (i.e., constant-depth) quantum circuits perform equivalent computations. Equivalence checking is a fundamental correctness question—needed, for example, to ensure that transformations ap...
Why many-partite entanglement is essential for holography
Norihiro Iizuka, Simon Lin, Mitsuhiro Nishida·Apr 2, 2025
We argue that many-partite entanglement is ubiquitous in holography and holographic quantum error correction codes. We base our claim on genuine multi-entropy, a new measure for multi-partite entanglement. We also discuss a connection between the bul...
General channel capacities from quantum channel-state duality
Y.-D. Liu, D.-S. Wang·Apr 2, 2025
The quantum channel-state duality permits the characterization of a quantum process through a quantum state, referred to as a Choi state. This characteristic serves as the impetus for the quantum computing paradigm that utilizes Choi states as inform...
Bayesian critical points in classical lattice models
Adam Nahum, J. Jacobsen·Apr 2, 2025
The Boltzmann distribution encodes our subjective knowledge of the configuration in a classical lattice model, given only its Hamiltonian. If we acquire further information about the configuration from measurement, our knowledge is updated accordin...
Variational Preparation of Entangled States in a System of Transmon Qubits
Alexander Yeremeyev, A. Tolstobrov, G. Fedorov +11 more·Apr 2, 2025
The conventional method for generating entangled states in qubit systems relies on applying precise two‐qubit entangling gates alongside single‐qubit rotations. However, achieving high‐fidelity entanglement demands high accuracy in two‐qubit operatio...
Adaptive Mesh Refinement Quantum Algorithm for Maxwell's Equations
Élise Fressart, Michel Nowak, Nicole Spillane·Apr 2, 2025
Algorithms that promise to leverage resources of quantum computers efficiently to accelerate the finite element method have emerged. However, the finite element method is usually incorporated into a high-level numerical scheme which allows the adapti...
Sub-second spin and lifetime-limited optical coherences in 171Yb3+:CaWO4.
A. Tiranov, E. Green, Sophie Hermans +8 more·Apr 2, 2025
Optically addressable solid-state spins have been extensively studied for quantum technologies, offering unique advantages for quantum computing, communication, and sensing. Advancing these applications is generally limited by finding materials that ...
Threshold for Fault-tolerant Quantum Advantage with the Quantum Approximate Optimization Algorithm
Sivaprasad Omanakuttan, Zichang He, Zhiwei Zhang +9 more·Apr 2, 2025
Optimization is often cited as a promising application of quantum computers. However, the low degree of provable quantum speedups has led prior rigorous end-to-end resource analyses to conclude that a quantum computer is unlikely to surpass classical...
Covariant decomposable maps on C*-algebras and quantum dynamics
Krzysztof Szczygielski·Apr 1, 2025
We characterize covariant positive decomposable maps between unital C*-algebras in terms of a dilation theorem, which generalizes a seminal result by H. Scutaru from Rep. Math. Phys. 16 (1):79-87, 1979. As a case study, we provide a certain character...
Double-bracket algorithm for quantum signal processing without post-selection
Yudai Suzuki, Bi Hong Tiang, Jeongrak Son +3 more·Apr 1, 2025
Quantum signal processing (QSP), a framework for implementing matrix-valued polynomials, is a fundamental primitive in various quantum algorithms. Despite its versatility, a potentially underappreciated challenge is that all systematic protocols for ...
Enhanced sensitivity in microscale high-field NMR via nuclear-spin locking with NV centers
Oliver T. Whaites, Jaime García Oliván, Jorge Casanova·Apr 1, 2025
Solid state defects such as nitrogen vacancy (NV) centers in diamond have been utilized for NMR sensing at ambient temperatures for samples at the nano-scale and up to the micro-scale. Similar to standard NMR, NV-sensitivities can be increased using ...
Entanglement and Optimal Timing in Discriminating Quantum Dynamical Processes
Massimiliano F. Sacchi·Apr 1, 2025
I investigate the problem of optimally discriminating between two open quantum dynamical processes in a single-shot scenario, with the goal of minimizing the error probability of identification. This task involves optimising both the input state -- p...
Entanglement recycling in two-step port-based teleportation
Piotr Kopszak, Dmitry Grinko, Adam Burchardt +3 more·Apr 1, 2025
A protocol involving the repetitive (twofold, to be precise) application of PBT protocol to the same resource is studied. The quantities characterizing the resulting protocol, so-called \textit{two-step PBT}, namely \textit{enatnglement fidelity} and...
Dissipation and non-thermal states in cryogenic cavities
Zeno Bacciconi, Giulia Piccitto, Alessandro Maria Verga +3 more·Apr 1, 2025
We study the properties of photons in a cryogenic cavity, made by cryo-cooled mirrors surrounded by a room temperature environment. We model such a system as a multimode cavity coupled to two thermal reservoirs at different temperatures. Using a Lind...
Loschmidt echo zeros in finite-size quantum systems with linear quench
Zhen-Yu Zheng, Xudong Liu, Siyan Lin +2 more·Apr 1, 2025
Dynamical quantum phase transitions reveal singularities in quench dynamics, characterized by the emergence of Loschmidt echo zeros at critical times, which usually exist only in the thermodynamic limit but are absent in finite-size quantum systems. ...
Output Prediction of Quantum Circuits based on Graph Neural Networks
Yuxiang Liu, Fanxu Meng, Lu Wang +3 more·Apr 1, 2025
The output prediction of quantum circuits is a formidably challenging task imperative in developing quantum devices. Motivated by the natural graph representation of quantum circuits, this paper proposes a Graph Neural Networks (GNNs)-based framework...
Lower Bounds on Pauli Manipulation Detection Codes
Keiya Ichikawa, Kenji Yasunaga·Apr 1, 2025
We present a lower bound for Pauli Manipulation Detection (PMD) codes, a class of quantum codes that detect every Pauli error with high probability. Our lower bound reveals the first trade-off between the error parameter and the coding rate. Specific...
General Oscillator-Based Ising Machine Models with Phase-Amplitude Dynamics and Polynomial Interactions
Lianlong Sun, Matthew X. Burns, Michael C. Huang·Apr 1, 2025
We present an oscillator model with both phase and amplitude dynamics for oscillator-based Ising machines (OIMs). The model targets combinatorial optimization problems with polynomial cost functions of arbitrary order and addresses fundamental limita...
A Minimal Introduction to Quantum Computing
M. Mahmud, Daniel Charles Goldsmith·Apr 1, 2025
In this article, we present an introduction to quantum computing (QC) tailored for computing professionals such as programmers, machine learning engineers, and data scientists. Our approach abstracts away the physics underlying QC, which can be chall...