Papers
Live trends in quantum computing research, updated daily from arXiv.
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13,127 papers in 12 months (+1% vs prior quarter)
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Identification of Symmetry-Protected Topological States on Noisy Quantum Computers.
Daniel Azses, R. Haenel, Y. Naveh +3 more·Feb 11, 2020
Identifying topological properties is a major challenge because, by definition, topological states do not have a local order parameter. While a generic solution to this challenge is not available yet, a broad class of topological states, namely, symm...
Quantum Image Processing: the truth, the whole truth, and nothing but the truth about its problems on internal image representation and outcomes recovering
Mario Mastriani·Feb 6, 2020
In this paper, three techniques of internal image-representation in a quantum computer are compared: Flexible Representation of Quantum Images (FRQI), Novel Enhanced Quantum Representation of digital images (NEQR), and Quantum Boolean Image Processin...
Policy Gradient based Quantum Approximate Optimization Algorithm
Jiahao Yao, Marin Bukov, Lin Lin·Feb 4, 2020
The quantum approximate optimization algorithm (QAOA), as a hybrid quantum/classical algorithm, has received much interest recently. QAOA can also be viewed as a variational ansatz for quantum control. However, its direct application to emergent quan...
Experimental quantum conference key agreement
Massimiliano Proietti, Joseph Ho, F. Grasselli +3 more·Feb 4, 2020
When Alice and Bob invite their friends, quantum key distribution with multiparty entanglement enables secure conference call. Quantum networks will provide multinode entanglement enabling secure communication on a global scale. Traditional quantum c...
Quantum Simulation of Field Theories Without State Preparation
Siddhartha Harmalkar, Henry Lamm, S. Lawrence·Jan 30, 2020
We propose an algorithm for computing real-time observables using a quantum processor while avoiding the need to prepare the full quantum state. This reduction in quantum resources is achieved by classically sampling configurations in imaginary-time ...
Intel Quantum Simulator: a cloud-ready high-performance simulator of quantum circuits
G. Guerreschi, J. Hogaboam, F. Baruffa +1 more·Jan 28, 2020
Classical simulation of quantum computers will continue to play an essential role in the progress of quantum information science, both for numerical studies of quantum algorithms and for modeling noise and errors. Here we introduce the latest release...
Theory of field-modulated spin valley orbital pseudospin physics
Feng-Wu Chen, Yu-Shu Wu·Jan 24, 2020
Pioneering studies in transition metal dichalcogenides have demonstrated convincingly the co-existence of multiple angular momentum degrees of freedom -- of spin (1/2 $s_z = \pm 1/2$), valley ($\tau = K, K'$ or $\pm 1$), and atomic orbital ($l_z = \p...
Classically Simulating Quantum Circuits with Local Depolarizing Noise
Y. Takahashi, Yuki Takeuchi, S. Tani·Jan 23, 2020
We study the effect of noise on the classical simulatability of quantum circuits defined by computationally tractable (CT) states and efficiently computable sparse (ECS) operations. Examples of such circuits, which we call CT-ECS circuits, are IQP, C...
Modeling noisy quantum circuits using experimental characterization
Megan L. Dahlhauser, T. Humble·Jan 23, 2020
Noisy intermediate-scale quantum (NISQ) devices offer unique platforms to test and evaluate the behavior of non-fault-tolerant quantum computing. However, validating programs on NISQ devices is difficult due to fluctuations in the underlying noise so...
Quantifying computational advantage of Grover’s algorithm with the trace speed
Valentin Gebhart, L. Pezz'e, A. Smerzi·Jan 13, 2020
Despite intensive research, the physical origin of the speed-up offered by quantum algorithms remains mysterious. No general physical quantity, like, for instance, entanglement, can be singled out as the essential useful resource. Here we report a cl...
Software tools for quantum control: improving quantum computer performance through noise and error suppression
H. Ball, M. Biercuk, A. Carvalho +15 more·Jan 13, 2020
Effectively manipulating quantum computing (QC) hardware in the presence of imperfect devices and control systems is a central challenge in realizing useful quantum computers. Susceptibility to noise critically limits the performance and capabilities...
Software Mitigation of Crosstalk on Noisy Intermediate-Scale Quantum Computers
Prakash Murali, D. McKay, M. Martonosi +1 more·Jan 9, 2020
Crosstalk is a major source of noise in Noisy Intermediate-Scale Quantum (NISQ) systems and is a fundamental challenge for hardware design. When multiple instructions are executed in parallel, crosstalk between the instructions can corrupt the quantu...
Noisy Simulation of Quantum Beats in Radical Pairs on a Quantum Computer
Brian Rost, B. Jones, M. Vyushkova +4 more·Jan 3, 2020
Current and near term quantum computers (i.e. NISQ devices) are limited in their computational power in part due to imperfect gate operations and imperfect qubits. This naturally constrains the computations run on these devices to be low-depth and sh...
Deep Q-learning decoder for depolarizing noise on the toric code
David Fitzek, Mattias Eliasson, A. F. Kockum +1 more·Dec 30, 2019
We present an AI-based decoding agent for quantum error correction of depolarizing noise on the toric code. The agent is trained using deep reinforcement learning (DRL), where an artificial neural network encodes the state-action Q-values of error-co...
Measurement-free preparation of grid states
Jacob Hastrup, Kimin Park, J. B. Brask +2 more·Dec 29, 2019
Quantum computing potentially offers exponential speed-ups over classical computing for certain tasks. A central, outstanding challenge to making quantum computing practical is to achieve fault tolerance, meaning that computations of any length or si...
Calculation of \(\pi \) on the IBM quantum computer and the accuracy of one-qubit operations
G. Bochkin, S. Doronin, E. Fel'dman +1 more·Dec 27, 2019
A quantum algorithm for the calculation of $\pi$ is proposed and implemented on the five-qubit IBM quantum computer with superconducting qubits. We find $\pi=3.157\pm0.017$. The error is due to the noise of quantum one-qubit operations and measuremen...
Quantum logic gate synthesis as a Markov decision process
M. S. Alam, Noah F. Berthusen, P. Orth·Dec 27, 2019
Reinforcement learning has witnessed recent applications to a variety of tasks in quantum programming. The underlying assumption is that those tasks could be modeled as Markov decision processes (MDPs). Here, we investigate the feasibility of this as...
Automated discovery of logical gates for quantum error correction
Hongxiang Chen, M. Vasmer, N. P. Breuckmann +1 more·Dec 20, 2019
Quantum error correcting codes protect quantum computation from errors caused by decoherence and other noise. Here we study the problem of designing logical operations for quantum error correcting codes. We present an automated procedure that generat...
Quantum natural gradient generalized to noisy and nonunitary circuits
Bálint Koczor, S. Benjamin·Dec 18, 2019
Variational quantum algorithms are promising tools whose efficacy depends on their optimisation method. For noise-free unitary circuits, the quantum generalisation of natural gradient descent has been introduced and shown to be equivalent to imaginar...
Scalable Bayesian Hamiltonian learning
T. Evans, R. Harper, S. Flammia·Dec 16, 2019
As the size of quantum devices continues to grow, the development of scalable methods to characterise and diagnose noise is becoming an increasingly important problem. Recent methods have shown how to efficiently estimate Hamiltonians in principle, b...