Papers
Live trends in quantum computing research, updated daily from arXiv.
Total Papers
27,548
This Month
1,041
Today
0
Research Volume
12,930 papers in 12 months (-5% vs prior quarter)
Research Focus Areas
Papers by research theme (12 months). Hover for details.
Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Practical quantum simulation of small-scale non-Hermitian dynamics
Hong-fang Liu, Xiaodong Yang, Kai Tang +5 more·Nov 27, 2022
Non-Hermitian quantum systems have recently attracted considerable attention due to their exotic properties. Though many experimental realizations of non-Hermitian systems have been reported, the non-Hermiticity usually resorts to the hard-to-control...
Loschmidt echo and scrambling of systematic errors in tomography -- a quantum signature of chaos
Abinash Sahu, Naga Dileep Varikuti, Vaibhav Madhok·Nov 21, 2022
How does quantum chaos lead to rapid scrambling of information as well as systematic errors across a system when one introduces perturbations in the dynamics? What are its consequences for the reliability of quantum simulations and quantum informatio...
Quantum Algorithm for Estimating Largest Eigenvalues
Nhat A. Nghiem, T. Wei·Nov 11, 2022
A majority of numerical scientific computation relies heavily on handling and manipulating matrices, such as solving linear equations, finding eigenvalues and eigenvectors, and so on. Many quantum algorithms have been developed to advance these compu...
Quantum Differential Equation Solvers: Limitations and Fast-Forwarding
Dong An, Jin-Peng Liu, Daochen Wang +1 more·Nov 9, 2022
We study the limitations and fast-forwarding of quantum algorithms for linear ordinary differential equation (ODE) systems with a particular focus on non-quantum dynamics, where the coefficient matrix in the ODE is not anti-Hermitian or the ODE is in...
A Comparison of Encoding Techniques for an Analog Quantum Emulation Device
Sharan Mourya·Nov 6, 2022
Quantum computers can outperform classical computers in certain tasks. However, there are still many challenges to the current quantum computers such as decoherence and fault tolerance, and other drawbacks such as portability and accessibility. In th...
Non-Hermitian ground-state-searching algorithm enhanced by a variational toolbox
Yu-Qin Chen, Shi-Xin Zhang, Chang-Yu Hsieh +1 more·Oct 17, 2022
Ground-state preparation for a given Hamiltonian is a common quantum-computing task of great importance and has relevant applications in quantum chemistry, computational material modeling, and combinatorial optimization. We consider an approach to si...
Speeding Up Entanglement Generation by Proximity to Higher-Order Exceptional Points.
Zeng-Zhao Li, Weijian Chen, M. Abbasi +2 more·Oct 10, 2022
Entanglement is a key resource for quantum information technologies ranging from quantum sensing to quantum computing. Conventionally, the entanglement between two coupled qubits is established at the timescale of the inverse of the coupling strength...
Exploring the role of parameters in variational quantum algorithms
Abhinav Anand, Sumner Alperin-Lea, A. Choquette +1 more·Sep 28, 2022
In this work, we introduce a quantum-control-inspired method for the characterization of variational quantum circuits using the rank of the dynamical Lie algebra associated with the hermitian generator(s) of the individual layers. Layer-based archite...
Classical and Quantum Iterative Optimization Algorithms Based on Matrix Legendre-Bregman Projections
Zhengfeng Ji·Sep 28, 2022
We consider Legendre-Bregman projections defined on the Hermitian matrix space and design iterative optimization algorithms based on them. A general duality theorem is established for Bregman divergences on Hermitian matrices, and it plays a crucial ...
Tripartite high-dimensional magnon-photon entanglement in PT -symmetry broken phases of a non-Hermitian hybrid system
Jin-Xuan Han, Jinling Wang, Yan Xia +2 more·Jun 26, 2022
Hybrid systems that combine spin ensembles and superconducting circuits provide a promising platform for implementing quantum information processing. We propose a non-Hermitian magnon-circuit-QED hybrid model consisting of two cavities and an yttrium...
Fourier-based quantum signal processing
T. L. Silva, Lucas Borges, L. Aolita·Jun 6, 2022
Implementing general functions of operators is a powerful tool in quantum computation. It can be used as the basis for a variety of quantum algorithms including matrix inversion, real and imaginary-time evolution, and matrix powers. Quantum signal pr...
Variational approach to quantum state tomography based on maximal entropy formalism.
Rishabh Gupta, M. Sajjan, R. Levine +1 more·Jun 6, 2022
Quantum state tomography is an integral part of quantum computation and offers the starting point for the validation of various quantum devices. One of the central tasks in the field of state tomography is to reconstruct, with high fidelity, the quan...
A Quantum-compute Algorithm for Exact Laser-driven Electron Dynamics in Molecules
Fabian Langkabel, A. Bande·May 21, 2022
In this work, we investigate the capability of known quantum-computing algorithms for fault-tolerant quantum computing to simulate the laser-driven electron dynamics in small molecules such as lithium hydride. These computations are executed on a qua...
Accelerated Convergence of Contracted Quantum Eigensolvers through a Quasi-Second-Order, Locally Parameterized Optimization
Scott E. Smart, D. Mazziotti·May 3, 2022
A contracted quantum eigensolver (CQE) finds a solution to the many-electron Schrödinger equation by solving its integration (or contraction) to the two-electron space—a contracted Schrödinger equation (CSE)—on a quantum computer. When applied to the...
Quantum error mitigation by hidden inverses protocol in superconducting quantum devices
Vicente Leyton-Ortega, Swarnadeep Majumder, R. Pooser·Apr 26, 2022
We present a method to improve the convergence of variational algorithms based on hidden inverses (HIs) to mitigate coherent errors. In the context of error mitigation, this means replacing the hardware implementation of certain Hermitian gates with ...
Designing exceptional-point-based graphs yielding topologically guaranteed quantum search
Quancheng Liu, D. Kessler, E. Barkai·Feb 8, 2022
Quantum walks underlie an important class of quantum computing algorithms, and represent promising approaches in various simulations and practical applications. Here we design stroboscopically monitored quantum walks and their subsequent graphs that ...
Quantum Orbital Minimization Method for Excited States Calculation on a Quantum Computer.
Joel Bierman, Yingzhou Li, Jianfeng Lu·Jan 20, 2022
We propose a quantum-classical hybrid variational algorithm, the quantum orbital minimization method (qOMM), for obtaining the ground state and low-lying excited states of a Hermitian operator. Given parametrized ansatz circuits representing eigensta...
Orders of magnitude reduction in the computational overhead for quantum many-body problems on quantum computers via an exact transcorrelated method
I. O. Sokolov, Werner Dobrautz, Hongjun Luo +2 more·Jan 9, 2022
Transcorrelated methods provide an efficient way of partially transferring the description of electronic correlations from the ground state wavefunction directly into the underlying Hamiltonian. In particular, Dobrautz et al. [Phys. Rev. B, 99(7), 07...
Quantum signal processing for simulating cold plasma waves
I. Novikau, E. Startsev, I. Dodin·Dec 11, 2021
Numerical modeling of radio-frequency waves in plasma with sufficiently high spatial and temporal resolution remains challenging even with modern computers. However, such simulations can be sped up using quantum computers in the future. Here, we propo...
Tight bound for estimating expectation values from a system of linear equations
Abhijeet Alase, Robert Nerem, Mohsen Bagherimehrab +2 more·Nov 20, 2021
The System of Linear Equations Problem (SLEP) is specified by a complex invertible matrix A , the condition number κ of A , a vector b , a Hermitian matrix M and an accuracy ǫ , and the task is to estimate x † M x , where x is the solution vector to t...