Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Finite-Size Scaling on a Digital Quantum Simulator Using Quantum Restricted Boltzmann Machine
B. Khalid, Shree Hari Sureshbabu, A. Banerjee +1 more·Jan 31, 2022
The critical point and the critical exponents for a phase transition can be determined using the Finite-Size Scaling (FSS) analysis. This method assumes that the phase transition occurs only in the infinite size limit. However, there has been a lot o...
Quantum algorithms for Schrieffer-Wolff transformation
Zongkang Zhang, Yongdan Yang, Xiaosi Xu +1 more·Jan 31, 2022
The Schrieffer-Wolff transformation aims to solve degenerate perturbation problems and give an effective Hamiltonian that describes the low-energy dynamics of the exact Hamiltonian in the low-energy subspace of unperturbed Hamiltonian. This unitary t...
Harmonic flow-field representations of quantum bits and gates
Vishal P. Patil, Žiga Kos, Jörn Dunkel·Jan 30, 2022
We describe a general procedure for mapping arbitrary n-qubit states to two-dimensional (2D) vector fields. The mappings use complex rational function representations of individual qubits, producing classical vector field configurations that can be i...
Optimality conditions for spatial search with multiple marked vertices
Mathieu Roget, H. Kadri, Giuseppe Di Molfetta·Jan 30, 2022
We contribute to fulfil the long-lasting gap in the understanding of the spatial search with multiple marked vertices. The theoretical framework is that of discrete-time quantum walks (QW), \textit{i.e.} local unitary matrices that drive the evolutio...
Gate-based quantum computing for protein design
Mohammad Hassan Khatami, U. C. Mendes, N. Wiebe +1 more·Jan 29, 2022
Protein design is a technique to engineer proteins by permuting amino acids in the sequence to obtain novel functionalities. However, exploring all possible combinations of amino acids is generally impossible due to the exponential growth of possibil...
Recommender System Expedited Quantum Control Optimization
Priyanka Batra, M. H. Ram, T. S. Mahesh·Jan 29, 2022
Quantum control optimization algorithms are routinely used to generate optimal quantum gates or efficient quantum state transfers. However, there are two main challenges in designing efficient optimization algorithms, namely overcoming the sensitivit...
Quantum sampling for the Euclidean path integral of lattice gauge theory
A. Yamamoto·Jan 29, 2022
Although the Hamiltonian formalism is so far favored for quantum computation of lattice gauge theory, the path integral formalism would never be useless. The advantages of the path integral formalism are the knowl-edge and experience accumulated by c...
Standard quantum annealing outperforms adiabatic reverse annealing with decoherence
G. Passarelli, K. Yip, Daniel A. Lidar +1 more·Jan 28, 2022
We study adiabatic reverse annealing (ARA) in an open system. In the closed system (unitary) setting, this annealing protocol allows avoidance of first-order quantum phase transitions of selected models, resulting in an exponential speedup compared w...
Nonunitary gate operations by dissipation engineering
Elias Zapusek, A. Javadi, F. Reiter·Jan 28, 2022
Irreversible logic is at odds with unitary quantum evolution. Emulating such operations by classical measurements can result in disturbances and high resource demands. To overcome these limitations, we propose protocols that harness dissipation to re...
Multi-round QAOA and advanced mixers on a trapped-ion quantum computer
Yingyue Zhu, Zewen Zhang, Bhuvanesh Sundar +5 more·Jan 28, 2022
Combinatorial optimization problems on graphs have broad applications in science and engineering. The quantum approximate optimization algorithm (QAOA) is a method to solve these problems on a quantum computer by applying multiple rounds of variation...
Decoding Merged Color-Surface Codes and Finding Fault-Tolerant Clifford Circuits Using Solvers for Satisfiability Modulo Theories
Noah Shutty, C. Chamberland·Jan 28, 2022
Universal fault-tolerant quantum computers will require the use of efficient protocols to implement encoded operations necessary in the execution of algorithms. In this work, we show how solvers for satisfiability modulo theories (SMT solvers) can be u...
Mana and thermalization: Probing the feasibility of near-Clifford Hamiltonian simulation
Troy J. Sewell, C. White·Jan 28, 2022
Quantum hydrodynamics is the emergent classical dynamics governing transport of conserved quantities in generic strongly-interacting quantum systems. Recent matrix product operator methods have made simulations of quantum hydrodynamics in 1+1d tracta...
Solving MaxCut with quantum imaginary time evolution
Rizwanul Alam, G. Siopsis, R. Herrman +3 more·Jan 28, 2022
We introduce a method to solve the MaxCut problem efficiently based on quantum imaginary time evolution (QITE). We employ a linear Ansatz for unitary updates and an initial state involving no entanglement, as well as an imaginary-time-dependent Hamil...
Self-correcting quantum many-body control using reinforcement learning with tensor networks
F. Metz, M. Bukov·Jan 27, 2022
Quantum many-body control is a central milestone en route to harnessing quantum technologies. However, the exponential growth of the Hilbert space dimension with the number of qubits makes it challenging to classically simulate quantum many-body syst...
Quantum State Preparation with Optimal Circuit Depth: Implementations and Applications.
Xiao-Ming Zhang, Tongyang Li, Xiao Yuan·Jan 27, 2022
Quantum state preparation is an important subroutine for quantum computing. We show that any n-qubit quantum state can be prepared with a Θ(n)-depth circuit using only single- and two-qubit gates, although with a cost of an exponential amount of anci...
Spectral broadening of a single Er$^{3+}$ ion in a Si nano-transistor
Jiliang Yang, Jian Wang, Wenda Fan +9 more·Jan 27, 2022
Single rare-earth ions in solids show great potential for quantum applications, including single photon emission, quantum computing, and high-precision sensing. However, homogeneous linewidths observed for single rare-earth ions are orders of magnitu...
Quantum algorithm for calculating risk contributions in a credit portfolio
Koichi Miyamoto·Jan 27, 2022
Finance is one of the promising field for industrial application of quantum computing. In particular, quantum algorithms for calculation of risk measures such as the value at risk and the conditional value at risk of a credit portfolio have been prop...
Sampling rare conformational transitions with a quantum computer
Danial Ghamari, P. Hauke, Roberto Covino +1 more·Jan 27, 2022
Structural rearrangements play a central role in the organization and function of complex biomolecular systems. In principle, Molecular Dynamics (MD) simulations enable us to investigate these thermally activated processes with an atomic level of res...
Block-encoding dense and full-rank kernels using hierarchical matrices: applications in quantum numerical linear algebra
Quynh T. Nguyen, B. Kiani, S. Lloyd·Jan 27, 2022
Many quantum algorithms for numerical linear algebra assume black-box access to a block-encoding of the matrix of interest, which is a strong assumption when the matrix is not sparse. Kernel matrices, which arise from discretizing a kernel function k...
Quantum Simulation of Dissipative Collective Effects on Noisy Quantum Computers
M. Cattaneo, M. Rossi, Guillermo Garc'ia-P'erez +2 more·Jan 27, 2022
Dissipative collective effects are ubiquitous in quantum physics, and their relevance ranges from the study of entanglement in biological systems to noise mitigation in quantum computers. Here, we put forward the first fully quantum simulation of dis...