Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Hardware-efficient ansatz without barren plateaus in any depth
Chae-Yeun Park, Minhyeok Kang, Joonsuk Huh·Mar 7, 2024
Variational quantum circuits have recently gained much interest due to their relevance in real-world applications, such as combinatorial optimizations, quantum simulations, and modeling a probability distribution. Despite their huge potential, the pr...
Heisenberg-Limited Quantum Metrology without Ancillae.
Qiushi Liu, Yuxiang Yang·Mar 7, 2024
Extensive research has been dedicated to the asymptotic theory of quantum metrology, where the goal is to determine the ultimate precision limit of quantum channel estimation when many accesses to the channel are allowed. The ultimate limit has been ...
Efficient Magic State Distillation by Zero-level Distillation
Tomohiro Itogawa, Yugo Takada, Yutaka Hirano +1 more·Mar 7, 2024
Magic state distillation (MSD) is an essential element for universal fault-tolerant quantum computing, which distills a high-fidelity magic state from noisy magic states using ideal (error-corrected) Clifford operations. For ideal Clifford operations...
Analysis of Maximum Threshold and Quantum Security for Fault-Tolerant Encoding and Decoding Scheme Base on Steane Code
Qiqing Xia, Huiqin Xie, Li Yang·Mar 7, 2024
Steane code is one of the most widely studied quantum error-correction codes, which is a natural choice for fault-tolerant quantum computation (FTQC). However, the original Steane code is not fault-tolerant because the CNOT gates in an encoded block ...
Error Correction in Dynamical Codes
Esther Xiaozhen Fu, Daniel Gottesman·Mar 7, 2024
We ask what is the general framework for a quantum error correcting code that is defined by a sequence of measurements. Recently, there has been much interest in Floquet codes and space-time codes. In this work, we define and study the distance of a ...
Assessing the query complexity limits of quantum phase estimation using symmetry-aware spectral bounds
Cristian L. Cortes, Dario Rocca, Jérôme F. Gonthier +7 more·Mar 7, 2024
The computational cost of quantum algorithms for physics and chemistry is closely linked to the spectrum of the Hamiltonian, a property that manifests in the necessary rescaling of its eigenvalues. The typical approach of using the 1-norm as an upper...
Highly stable power control for chip-based continuous-variable quantum key distribution system.
Yiming Bian, Yang Li, Xuesong Xu +7 more·Mar 7, 2024
Quantum key distribution allows secret key generation with information theoretical security. It can be realized with photonic integrated circuits to benefit the tiny footprints and the large-scale manufacturing capacity. Continuous-variable quantum k...
A multiplexed control architecture for superconducting qubits with row-column addressing
Peng Zhao·Mar 6, 2024
In state-of-the-art superconducting quantum processors, each qubit is controlled by at least one control line that delivers control pulses generated at room temperature to qubits operating at millikelvin temperatures. While this strategy has been suc...
Denoising Gradient Descent in Variational Quantum Algorithms
Lars Simon, Holger Eble, Hagen-Henrik Kowalski +1 more·Mar 6, 2024
In this article we introduce an algorithm for mitigating the adverse effects of noise on gradient descent in variational quantum algorithms. This is accomplished by computing a {\emph{regularized}} local classical approximation to the objective funct...
Hermitian-preserving ansatz and variational open quantum eigensolver
Zhong-Xia Shang·Mar 6, 2024
We propose a new variational quantum algorithm named Variational Open Quantum Eigensolver (VOQE) for solving steady states of open quantum systems described by either Lindblad master equations or non-Hermitian Hamiltonians. In VOQE, density matrices ...
Reducing the Runtime of Fault-Tolerant Quantum Simulations in Chemistry through Symmetry-Compressed Double Factorization
Dario Rocca, Cristian L. Cortes, Jérôme F. Gonthier +7 more·Mar 6, 2024
Quantum phase estimation based on qubitization is the state-of-the-art fault-tolerant quantum algorithm for computing ground-state energies in chemical applications. In this context, the 1-norm of the Hamiltonian plays a fundamental role in determini...
Scrambling transition in free fermion systems induced by a single impurity
Qucheng Gao, T. Zhou, Pengfei Zhang +1 more·Mar 6, 2024
In quantum many-body systems, interactions play a crucial role in the emergence of information scrambling. When particles interact throughout the system, the entanglement between them can lead to a rapid and chaotic spreading of quantum information, ...
Parameterized quantum comb and simpler circuits for reversing unknown qubit-unitary operations
Yin Mo, Lei Zhang, Yuanyi Chen +3 more·Mar 6, 2024
Quantum combs play a vital role in characterizing and transforming quantum processes, with wide-ranging applications in quantum information processing. However, obtaining the explicit quantum circuit for the desired quantum comb remains a challenging...
Mechanically Designing Protected Superconducting Qubits
Trevor McCourt·Mar 6, 2024
Significant progress is required in the engineering of large, interacting quantum systems in order to realize the promises of gate-model quantum computing. Designing such systems is challenging, as the dynamics of continuous variable quantum systems ...
Treespilation: architecture- and state-optimised fermion-to-qubit mappings
Aaron Miller, A. Glos, Zolt'an Zimbor'as·Mar 6, 2024
Quantum computers hold great promise for efficiently simulating Fermionic systems, benefiting fields like quantum chemistry and materials science. To achieve this, algorithms typically begin by choosing a Fermion-to-qubit mapping to encode the Fermio...
Quantum communication networks with defects in silicon carbide
Philipp Sohr, Philipp Koller, Sebastian Ecker +23 more·Mar 5, 2024
Quantum communication promises unprecedented capabilities enabled by the transmission of quantum states of light. However, current implementations face severe distance limitations due to photon loss. Silicon carbide (SiC) defects have emerged as a pr...
An Operational Framework for Nonclassicality in Quantum Communication Networks
Brian Doolittle, Felix Leditzky, Eric Chitambar·Mar 5, 2024
Quantum resources, such as entanglement or quantum communication, offer significant communication advantages in information processing. We develop an operational framework for realizing these communication advantages in resource-constrained quantum n...
Hamiltonian Property Testing
Andreas Bluhm, Matthias C. Caro, Aadil Oufkir·Mar 5, 2024
Locality is a fundamental feature of many physical time evolutions. Assumptions on locality and related structural properties also underlie recently proposed procedures for learning an unknown Hamiltonian from access to the induced time evolution. Ho...
Passive and active suppression of transduced noise in silicon spin qubits
Jaemin Park, Hyeongyu Jang, H. Sohn +7 more·Mar 5, 2024
Addressing and mitigating decoherence sources plays an essential role in the development of a scalable quantum computing system, which requires low gate errors to be consistently maintained throughout the circuit execution. While nuclear spin-free ma...
Quantum Mixed-State Self-Attention Network
Fu Chen, Qinglin Zhao, Li Feng +3 more·Mar 5, 2024
Attention mechanisms have revolutionized natural language processing. Combining them with quantum computing aims to further advance this technology. This paper introduces a novel Quantum Mixed-State Self-Attention Network (QMSAN) for natural language...