Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Does provable absence of barren plateaus imply classical simulability?
M. Cerezo, Martín Larocca, Diego Garc'ia-Mart'in +9 more·Dec 14, 2023
A large amount of effort has recently been put into understanding the barren plateau phenomenon. In this perspective article, we face the increasingly loud elephant in the room and ask a question that has been hinted at by many but not explicitly add...
SPulseGen: Succinct pulse generator architecture maximizing gate fidelity for superconducting quantum computers
Ryosuke Matsuo, Kazuhisa Ogawa, Hidehisa Shiomi +6 more·Dec 14, 2023
This paper proposes a cost-effective architecture for an RF pulse generator for superconducting qubits. Most existing works use arbitrary waveform generators (AWGs) that require both a large amount of high-bandwidth memories and high-performance anal...
Quantum improvement in Spatial Discretization
Saul Gonzalez, Parfait Atchade-Adelomou·Dec 14, 2023
Quantum algorithms have begun to surpass classical ones in several computation fields, yet practical application remains challenging due to hardware and software limitations. Here, we introduce a quantum algorithm that quadratically improves spatial ...
Complexity of Digital Quantum Simulation in the Low-Energy Subspace: Applications and a Lower Bound
Weiyuan Gong, Shuo Zhou, Tongyang Li·Dec 14, 2023
Digital quantum simulation has broad applications in approximating unitary evolution of Hamiltonians. In practice, many simulation tasks for quantum systems focus on quantum states in the low-energy subspace instead of the entire Hilbert space. In th...
Leveraging commuting groups for an efficient variational Hamiltonian ansatz
Abhinav Anand, Kenneth R. Brown·Dec 13, 2023
Efficiently calculating the low-lying eigenvalues of Hamiltonians, written as sums of Pauli operators, is a fundamental challenge in quantum computing. While various methods have been proposed to reduce the complexity of quantum circuits for this tas...
Towards determining the presence of barren plateaus in some chemically inspired variational quantum algorithms
Rui Mao, Guojing Tian, Xiaoming Sun·Dec 13, 2023
In quantum chemistry, the variational quantum eigensolver (VQE) is a promising algorithm for molecular simulations on near-term quantum computers. However, VQEs using hardware-efficient circuits face scaling challenges due to the barren plateau probl...
Performance of linear solvers in tensor-train format on current multicore architectures
Melven Röhrig-Zöllner, Manuel Joey Becklas, J. Thies +1 more·Dec 13, 2023
Tensor networks are a class of algorithms aimed at reducing the computational complexity of high-dimensional problems. They are used in an increasing number of applications, from quantum simulations to machine learning. Exploiting data parallelism in...
Radio Signal Classification by Adversarially Robust Quantum Machine Learning
Yanqiu Wu, Eromanga Adermann, Chandra Thapa +3 more·Dec 13, 2023
Radio signal classification plays a pivotal role in identifying the modulation scheme used in received radio signals, which is essential for demodulation and proper interpretation of the transmitted information. Researchers have underscored the high ...
Precise Phase Error Rate Analysis for Quantum Key Distribution with Phase Postselection
Yao Zhou, Zhen-Qiang Yin, Yong-Guang Shan +5 more·Dec 11, 2023
Quantum key distribution (QKD) stands as a pioneering method for establishing information-theoretically secure communication channels by utilizing the principles of quantum mechanics. In the security proof of QKD, the phase error rate serves as a cri...
Secure and Efficient Entanglement Distribution Protocols for Near-Term Quantum Internet
Nicholas Skjellum, Mohamed Shaban, Muhammad Ismail·Dec 10, 2023
Quantum information technology has the potential to revolutionize computing, communications, and security. To fully realize its potential, quantum processors with millions of qubits are needed, which are still far from being accomplished. Thus, it is...
Comprehensive Analysis of BB84, A Quantum Key Distribution Protocol
SujayKumar Reddy, C. Mohan·Dec 9, 2023
Quantum Key Distribution (QKD) is a technique that enables secure communication between two parties by sharing a secret key. One of the most well-known QKD protocols is the BB84 protocol, proposed by Charles Bennett and Gilles Brassard in 1984. In th...
Enhancing the electron pair approximation with measurements on trapped-ion quantum computers
Luning Zhao, Q. Wang, Joshua J. Goings +5 more·Dec 9, 2023
The electron pair approximation offers an efficient variational quantum eigensolver (VQE) approach for chemistry simulations on quantum computers. With the number of entangling gates scaling quadratically with system size and a constant measurement o...
Quantum Algorithms for Simulating Nuclear Effective Field Theories
James D. Watson, Jacob Bringewatt, Alexander F. Shaw +3 more·Dec 8, 2023
Quantum computers offer the potential to simulate nuclear processes that are classically intractable. With the goal of understanding the necessary quantum resources to realize this potential, we employ state-of-the-art Hamiltonian-simulation methods,...
Comparative study on compact quantum circuits of hybrid quantum-classical algorithms for quantum impurity models
Rihito Sakurai, Oliver J. Backhouse, George H Booth +2 more·Dec 7, 2023
Predicting the properties of strongly correlated materials is a significant challenge in condensed matter theory. The widely used dynamical mean-field theory faces difficulty in solving quantum impurity models numerically. Hybrid quantum--classical a...
Resource-Efficient Quantum Circuits for Molecular Simulations: A Case Study of Umbrella Inversion in Ammonia
R. NirmalM., S. Yamijala, Kalpak Ghosh +2 more·Dec 7, 2023
We conducted a thorough evaluation of various state-of-the-art strategies to prepare the ground state wavefunction of a system on a quantum computer, specifically within the framework of variational quantum eigensolver (VQE). Despite the advantages o...
Superconducting processor design optimization for quantum error correction performance
Xiaotong Ni, Ziang Wang, Rui Chao +1 more·Dec 7, 2023
In the quest for fault-tolerant quantum computation using superconducting processors, accurate performance assessment and continuous design optimization stands at the forefront. To facilitate both meticulous simulation and streamlined design optimiza...
Contextual subspace variational quantum eigensolver calculation of the dissociation curve of molecular nitrogen on a superconducting quantum computer
Tim Weaving, Alexis Ralli, Peter J. Love +2 more·Dec 7, 2023
We present an experimental demonstration of the Contextual Subspace Variational Quantum Eigensolver on superconducting hardware. Calculating the potential energy curve of molecular nitrogen proves challenging for many conventional quantum chemistry t...
Quantum algorithm for linear non-unitary dynamics with near-optimal dependence on all parameters
Dong An, Andrew M. Childs, Lin Lin·Dec 6, 2023
We introduce a family of identities that express general linear non-unitary evolution operators as a linear combination of unitary evolution operators, each solving a Hamiltonian simulation problem. This formulation can exponentially enhance the accu...
Logical quantum processor based on reconfigurable atom arrays
D. Bluvstein, S. Evered, A. Geim +19 more·Dec 6, 2023
Suppressing errors is the central challenge for useful quantum computing1, requiring quantum error correction (QEC)2–6 for large-scale processing. However, the overhead in the realization of error-corrected ‘logical’ qubits, in which information is e...
Clustering by Contour Coreset and Variational Quantum Eigensolver
Canaan Yung, Muhammad Usman·Dec 6, 2023
Recent work has proposed solving the k‐means clustering problem on quantum computers via the Quantum Approximate Optimization Algorithm (QAOA) and coreset techniques. Although the current method demonstrates the possibility of quantum k‐means cluster...