Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
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...
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...
Entanglement assisted training algorithm for supervised quantum classifiers
Soumik Adhikary·Jun 23, 2020
We propose a new training algorithm for supervised quantum classifiers. Here, we have harnessed the property of quantum entanglement to build a model that can simultaneously manipulate multiple training samples along with their labels. Subsequently, ...
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...
Quantum algorithmic differentiation
G. Colucci, F. Giacosa·Jun 23, 2020
In this work we present an algorithm to perform algorithmic differentiation in the context of quantum computing. We present two versions of the algorithm, one which is fully quantum and one which employees a classical step (hybrid approach). Since th...
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...
Optimising repeater schemes for the quantum internet
K. Goodenough, David Elkouss, S. Wehner·Jun 22, 2020
The rate at which quantum communication tasks can be performed using direct transmission is fundamentally hindered by the channel loss. Quantum repeaters allow, in principle, to overcome these limitations, but their introduction necessarily adds an a...
Probing many-body localization on a noisy quantum computer
D. Zhu, S. Johri, N. Nguyen +5 more·Jun 22, 2020
A disordered system of interacting particles exhibits localized behavior when the disorder is large compared to the interaction strength. Studying this phenomenon on a quantum computer without error correction is challenging because even weak couplin...
A polynomial time and space heuristic algorithm for T-count
M. Mosca, Priyanka Mukhopadhyay·Jun 22, 2020
An important part of reaping computational advantage from a quantum computer is to reduce the quantum resources needed to implement a desired quantum algorithm. Quantum algorithms that are too large to be practical on noisy intermediate scale quantum...
On the Structure of the CNOT-Dihedral Group
Shelly Garion, Andrew W. Cross·Jun 22, 2020
In this note we present explicit canonical forms for all the elements in the $2$-qubit CNOT-Dihedral group, with minimal numbers of controlled-$S$ ($CS$) and controlled-$X$ ($CX$) gates, using the generating set of quantum gates $[X, T, CX, CS]$. We ...
Minimal informationally complete measurements for probability representation of quantum dynamics
V. Yashin, E. Kiktenko, A. Mastiukova +1 more·Jun 22, 2020
In the present work, we suggest an approach for describing dynamics of finite-dimensional quantum systems in terms of pseudostochastic maps acting on probability distributions, which are obtained via minimal informationally complete quantum measureme...
Constructing driver Hamiltonians for optimization problems with linear constraints
H. Leipold, F. Spedalieri·Jun 22, 2020
Recent advances in the field of adiabatic quantum computing and the closely related field of quantum annealing have centered around using more advanced and novel Hamiltonian representations to solve optimization problems. One of these advances has ce...
High-Fidelity, High-Scalability Two-Qubit Gate Scheme for Superconducting Qubits.
Yuan Xu, Ji Chu, Jiahao Yuan +9 more·Jun 21, 2020
High-quality two-qubit gate operations are crucial for scalable quantum information processing. Often, the gate fidelity is compromised when the system becomes more integrated. Therefore, a low-error-rate, easy-to-scale two-qubit gate scheme is highl...
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...
Quantum Computer: Hello, Music!
E. Miranda·Jun 21, 2020
Quantum computing is emerging as a promising technology, which is built on the principles of subatomic physics. By the time of writing, fully fledged practical quantum computers are not widely available. But research and development are advancing rap...
Overhead of the non-local-to-local channel decomposition by quasiprobability sampling
K. Mitarai, K. Fujii·Jun 19, 2020
As the hardware technology for quantum computing advances, its possible applications are actively searched and developed. However, such applications still suffer from the noise on quantum devices, in particular when using two-qubit gates whose fideli...
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...
Floquet-enhanced spin swaps
Haifeng Qiao, Y. Kandel, J. Dyke +5 more·Jun 19, 2020
The transfer of information between quantum systems is essential for quantum communication and computation. In quantum computers, high connectivity between qubits can improve the efficiency of algorithms, assist in error correction, and enable high-f...
Shallow-circuit variational quantum eigensolver based on symmetry-inspired Hilbert space partitioning for quantum chemical calculations
Feng Zhang, N. Gomes, Noah F. Berthusen +4 more·Jun 19, 2020
Development of resource-friendly quantum algorithms remains highly desirable for noisy intermediate-scale quantum computing. Based on the variational quantum eigensolver (VQE) with unitary coupled cluster ansatz, we demonstrate that partitioning of t...
Quantum geometric machine learning for quantum circuits and control
Elija Perrier, D. Tao, C. Ferrie·Jun 19, 2020
The application of machine learning techniques to solve problems in quantum control together with established geometric methods for solving optimisation problems leads naturally to an exploration of how machine learning approaches can be used to enha...