Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Bell inequality violation on small NISQ computers
H. Naus, H. Technology, Netherlands Institute for Space Research +2 more·Jun 24, 2020
Quantum computational experiments exploiting Noisy Intermediate-Scale Quantum (NISQ) devices to demonstrate violation of a Bell inequality are proposed. They consist of running specified quantum algorithms on few-qubit computers. If such a device ass...
Error-correction and noise-decoherence thresholds for coherent errors in planar-graph surface codes
F. Venn, B. B'eri·Jun 23, 2020
We numerically study coherent errors in surface codes on planar graphs, focusing on noise of the form of $Z$- or $X$-rotations of individual qubits. We find that, similarly to the case of incoherent bit- and phase-flips, a trade-off between resilienc...
Self-learning eigenstates with a quantum processor
A. Kardashin, A. Uvarov, D. Yudin +1 more·Jun 23, 2020
Solutions to many-body problem instances often involve an intractable number of degrees of freedom and admit no known approximations in general form. In practice, representing quantum-mechanical states of a given Hamiltonian using available numerical...
Quantum computing with neutral atoms
L. Henriet, L. Beguin, A. Signoles +4 more·Jun 22, 2020
The manipulation of neutral atoms by light is at the heart of countless scientific discoveries in the field of quantum physics in the last three decades. The level of control that has been achieved at the single particle level within arrays of optica...
On Sampling and Inference using Quantum Algorithms
S. Ashutosh, D. Sarmah, Sayantani Pramanik +1 more·Jun 21, 2020
Quantum computers are projected to handle the Gibbs sampling and the related inference on Markov networks effectively. Apart from noting the background information useful for those starting the explorations in this important thread of Quantum Machine...
Solving optimization problems with Rydberg analog quantum computers: Realistic requirements for quantum advantage using noisy simulation and classical benchmarks
Michel Fabrice Serret, B. Marchand, T. Ayral·Jun 19, 2020
Platforms of Rydberg atoms have been proposed as promising candidates to solve some combinatorial optimization problems. Here, we compute quantitative requirements on the system sizes and noise levels that these platforms must fulfill to reach quantu...
Probabilistic nonunitary gate in imaginary time evolution
Tongqi Liu, Jin-Guo Liu, H. Fan·Jun 17, 2020
Simulation of quantum materials is a significant application of quantum computers. In contrast with the unitary operation which can be realized naturally on a quantum computer, the implementation of nonunitary operation, widely used in classical appr...
What are the prospects of using Grover's search in NISQ era?
Yulun Wang, P. Krstic·Jun 17, 2020
In order to understand the bounds of utilization of the Grover's search algorithm for the large unstructured data in presence of the quantum computer noise, we undertake a series of simulations by inflicting various types of noise, modelled by the IB...
Accelerated variational algorithms for digital quantum simulation of many-body ground states
Chufan Lyu, V. Montenegro, A. Bayat·Jun 16, 2020
One of the key applications for the emerging quantum simulators is to emulate the ground state of many-body systems, as it is of great interest in various fields from condensed matter physics to material science. Traditionally, in an analog sense, ad...
QED driven QAOA for network-flow optimization
Yuxuan Zhang, Ruizhe Zhang, A. Potter·Jun 16, 2020
We present a general framework for modifying quantum approximate optimization algorithms (QAOA) to solve constrained network flow problems. By exploiting an analogy between flow-constraints and Gauss' law for electromagnetism, we design lattice quant...
Quantum simulation and circuit design for solving multidimensional Poisson equations
M. Holzmann, H. Koestler·Jun 16, 2020
Many methods solve Poisson equations by using grid techniques which discretize the problem in each dimension. Most of these algorithms are subject to the curse of dimensionality, so that they need exponential runtime. In the paper "Quantum algorithm ...
Nonadiabatic Molecular Quantum Dynamics with Quantum Computers.
Pauline J. Ollitrault, G. Mazzola, I. Tavernelli·Jun 16, 2020
The theoretical investigation of nonadiabatic processes is hampered by the complexity of the coupled electron-nuclear dynamics beyond the Born-Oppenheimer approximation. Classically, the simulation of such reactions is limited by the unfavorable scal...
A dissymmetric [Gd2] coordination molecular dimer hosting six addressable spin qubits
F. Luis, P. Alonso, O. Roubeau +6 more·Jun 15, 2020
Artificial magnetic molecules can host several spin qubits, which could then implement small-scale algorithms. In order to become of practical use, such molecular spin processors need to increase the available computational space and warrant universa...
Fast multi-qubit gates by adiabatic evolution in interacting excited state manifolds.
M. Khazali, K. Mølmer·Jun 12, 2020
Quantum computing and quantum simulation can be implemented by concatenation of one- and two-qubit gates and interactions. For most physical implementations, however, it may be advantageous to explore state components and interactions that depart fro...
Quantum algorithm for smoothed particle hydrodynamics
R. Au-Yeung, A.J.M. Williams, V. Kendon +1 more·Jun 11, 2020
We present a quantum computing algorithm for the smoothed particle hydrodynamics (SPH) method. We use a normalization procedure to encode the SPH operators and domain discretization in a quantum register. We then perform the SPH summation via an inne...
Determining quantum phase diagrams of topological Kitaev-inspired models on NISQ quantum hardware
X. Xiao, J. Freericks, A. Kemper·Jun 9, 2020
Topological protection is employed in fault-tolerant error correction and in developing quantum algorithms with topological qubits. But, topological protection intrinsic to models being simulated, also robustly protects calculations, even on NISQ har...
Quantum computation of silicon electronic band structure.
F. Cerasoli, Kyle Sherbert, J. Sławińska +1 more·Jun 6, 2020
Development of quantum architectures during the last decade has inspired hybrid classical-quantum algorithms in physics and quantum chemistry that promise simulations of fermionic systems beyond the capability of modern classical computers, even befo...
Sign Problems in Quantum Field Theory: Classical and Quantum Approaches
S. Lawrence·Jun 5, 2020
Monte Carlo calculations in the framework of lattice field theory provide non-perturbative access to the equilibrium physics of quantum fields. When applied to certain fermionic systems, or to the calculation of out-of-equilibrium physics, these meth...
Algorithms for Quantum Simulation at Finite Energies
Sirui Lu, M. Bañuls, I. Cirac·Jun 4, 2020
We consider a quantum algorithm to compute expectation values of observables in a finite energy interval for many-body problems. It is based on a filtering operator, similar to quantum phase estimation, which projects out energies outside that interv...
Quantum computer-aided design: digital quantum simulation of quantum processors
T. Kyaw, Tim Menke, Sukin Sim +5 more·Jun 4, 2020
With the increasing size of quantum processors, sub-modules that constitute the processor hardware will become too large to accurately simulate on a classical computer. Therefore, one would soon have to fabricate and test each new design primitive an...