Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Splitting and connecting singlets in atomic quantum circuits
Zijie Zhu, Yann Kiefer, Samuel Jele +4 more·Sep 4, 2024
Gate operations composed in quantum circuits form the basis for digital quantum simulation and quantum processing. While two-qubit gates generally operate on nearest neighbours, many circuits require nonlocal connectivity and necessitate some form of...
Measuring Chern–Simons level k by braiding SU(2)k\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$SU(2)_k$$\end{documen
A. Belov, A. Morozov·Aug 26, 2024
Chern–Simons theory in application to the quantum computing is actively developing at the present. However, most discussed are the questions of using materials with known parameters and building corresponding quantum gates and algorithms. In this pap...
Toward a Theory of Phase Transitions in Quantum Control Landscapes
Nicolo Beato, Pranay Patil, Marin Bukov·Aug 20, 2024
Control landscape phase transitions (CLPTs) occur as abrupt changes in the cost function landscape upon varying a control parameter, and can be revealed by non-analytic points in statistical order parameters. A prime example are quantum speed limits ...
Enhancing Quantum Memory Lifetime with Measurement-Free Local Error Correction and Reinforcement Learning
Mincheol Park, N. Maskara, Marcin Kalinowski +1 more·Aug 18, 2024
Reliable quantum computation requires systematic identification and correction of errors that occur and accumulate in quantum hardware. To diagnose and correct such errors, standard quantum error-correcting protocols utilize $\textit{global}$ error i...
The x+y Floquet code: A simple example for topological quantum computation in the path integral approach
Andreas Bauer·Aug 14, 2024
The path-integral approach to topological quantum error correction provides a unified way to construct and analyze fault-tolerant circuits in spacetime. In this work, we demonstrate its utility and versatility at hand of a simple example: We construc...
Vestigial Gapless Boson Density Wave Emerging between $ν= 1/2$ Fractional Chern Insulator and Finite-Momentum Supersolid
Hongyu Lu, Han-Qing Wu, Bin-Bin Chen +1 more·Aug 13, 2024
The roton-triggered charge-density-wave (CDW)is widely studied in fractional quantum Hall (FQH) and fractional Chern insulator (FCI) systems, and there also exist field theoretical and numerical realizations of continuous transition from FCI to super...
Learning symmetry-protected topological order from trapped-ion experiments
Nicolas Sadoune, Ivan Pogorelov, C. Edmunds +6 more·Aug 9, 2024
Classical machine learning has proven remarkably useful in post-processing quantum data, yet typical learning algorithms often require prior training to be effective. In this work, we employ a tensorial kernel support vector machine (TK-SVM) to analy...
Operator space fragmentation in perturbed Floquet-Clifford circuits
Marcell D. Kovács, Christopher J. Turner, Lluis Masanes +1 more·Aug 2, 2024
Floquet quantum circuits are able to realise a wide range of non-equilibrium quantum states, exhibiting quantum chaos, topological order and localisation. In this work, we investigate the stability of operator localisation and emergence of chaos in r...
Analyzing Quantum Circuit Depth Reduction with Ancilla Qubits in MCX Gates
Ahmad Bennakhi, Paul Franzon, Gregory T. Byrd·Aug 2, 2024
This paper aims to give readers a high-level overview of the different MCX depth reduction techniques that utilize ancilla qubits. We also exhibit a brief analysis of how they would perform under different quantum topological settings. The techniques...
Efficient conversion from fermionic Gaussian states to matrix product states
Tong Liu, Ying-Hai Wu, Hong-Hao Tu +1 more·Aug 2, 2024
Fermionic Gaussian states (FGSs) are eigenstates of quadratic Hamiltonians and widely used in quantum many-body problems. We propose a highly efficient algorithm that converts FGSs to matrix product states (MPSs). It can be formulated for finite-size...
Persistent Topological Negativity in a High-Temperature Mixed-State
Yonna Kim, A. Lavasani, Sagar Vijay·Jul 31, 2024
We study the entanglement structure of the Greenberger-Horne-Zeilinger (GHZ) state as it thermalizes under a strongly-symmetric quantum channel describing the Metropolis-Hastings dynamics for the $d$-dimensional classical Ising model at inverse tempe...
Phase transitions in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mo>(</mml:mo><mml:mn>2</mml:mn><mml:mo>+</mml:mo><mml:mn>1</mml:mn><mml:mo>)</mml:mo><mml:mi mathvariant="normal">D</mml:mi></mml:mrow></mml:math> subsystem-symmetric monitored quantum circuits
Cole Kelson-Packer, A. Miyake·Jul 25, 2024
The interplay of unitary evolution and projective measurements is a modern interest in the study of many-body entanglement. On the one hand, the competition between these two processes leads to the recently discovered measurement-induced phase transi...
Breadth-first graph traversal union-find decoder
M. C. Lobl, Susan X. Chen, Stefano Paesani +1 more·Jul 22, 2024
Fast decoding algorithms are decisive for real-time quantum error correction and for analyzing properties of error correction codes. Here, we develop variants of the union-find decoder that simplify its implementation and provide potential decoding s...
Multicritical quantum sensors driven by symmetry-breaking
Sayan Mondal, Ayan Sahoo, Ujjwal Sen +1 more·Jul 19, 2024
Quantum criticality has been demonstrated as a useful quantum resource for parameter estimation. This includes second-order, topological and localization transitions. In all these works reported so far, gap-to-gapless transition at criticality has be...
Unruh-DeWitt Quantum Computing: Realizing Quantum Shannon Theory With Quantum Fields
Eric W. Aspling·Jul 18, 2024
Qubit-field quantum transduction provides numerous advantages to quantum computing, such as device-specific error-correcting codes, efficient scalability, and effective entanglement generation. An all-to-all connected bus of qubits implanted around t...
Dissipationless topological quantum computation for Majorana objects in the sparse-dense mixed encoding process
Ye-Min Zhan, Guan-Dong Mao, Yu-Ge Chen +2 more·Jul 16, 2024
Topological quantum computation based on Majorana objects is subject to a significant challenge because at least some of the two-qubit quantum gates rely on the fermion (either charge or spin) parity of the qubits. This dependency renders the quantum...
The geometry of the Hermitian matrix space and the Schrieffer--Wolff transformation
Gergő Pintér, György Frank, Dániel Varjas +1 more·Jul 15, 2024
In quantum mechanics, the Schrieffer--Wolff (SW) transformation (also called quasi-degenerate perturbation theory) is known as an approximative method to reduce the dimension of the Hamiltonian. We present a geometric interpretation of the SW transfo...
SSIP: automated surgery with quantum LDPC codes
Alexander Cowtan·Jul 12, 2024
We present Safe Surgery by Identifying Pushouts (SSIP), an open-source lightweight Python package for automating surgery between qubit CSS codes. SSIP is flexible: it is capable of performing both external surgery, that is surgery between two codeblo...
XYZ Ruby Code: Making a Case for a Three-Colored Graphical Calculus for Quantum Error Correction in Spacetime
J. M. D. L. Fuente, Josias Old, Alex Townsend-Teague +3 more·Jul 11, 2024
Analyzing and developing new quantum error-correcting (QEC) schemes is one of the most prominent tasks in quantum computing research. In such efforts, introducing time dynamics explicitly in both analysis and design of error-correcting protocols cons...
Colloquium: Synthetic quantum matter in non-standard geometries
Tobias Grass, Dario Bercioux, Utso Bhattacharya +3 more·Jul 8, 2024
Quantum simulation is making a significant impact on scientific research. The prevailing tendency of the field is to build quantum simulators that get closer to real-world systems of interest, in particular electronic materials. However, progress in ...