Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Path integral molecular dynamics for bosons
Barak Hirshberg, Valerio Rizzi, M. Parrinello·May 22, 2019
Significance Path integral molecular dynamics (PIMD) simulations are widely used to describe nuclear quantum effects in chemistry and physics. However, they neglect exchange symmetry, a fundamental property of quantum systems, since it is impossible ...
Power-optimal, stabilized entangling gate between trapped-ion qubits
R. Blümel, Nikodem Grzesiak, N. Pisenti +2 more·May 22, 2019
To achieve scalable quantum computing, improving entangling-gate fidelity and its implementation efficiency are of utmost importance. We present here a linear method to construct provably power-optimal entangling gates on an arbitrary pair of qubits ...
Efficient arbitrary simultaneously entangling gates on a trapped-ion quantum computer
Nikodem Grzesiak, R. Blümel, K. Wright +8 more·May 22, 2019
Efficiently entangling pairs of qubits is essential to fully harness the power of quantum computing. Here, we devise an exact protocol that simultaneously entangles arbitrary pairs of qubits on a trapped-ion quantum computer. The protocol requires cl...
General-Purpose Quantum Circuit Simulator with Projected Entangled-Pair States and the Quantum Supremacy Frontier.
Chu Guo, Yong Liu, Min Xiong +12 more·May 21, 2019
Recent advances on quantum computing hardware have pushed quantum computing to the verge of quantum supremacy. Here, we bring together many-body quantum physics and quantum computing by using a method for strongly interacting two-dimensional systems,...
Multistart Methods for Quantum Approximate optimization
Ruslan Shaydulin, Ilya Safro, Jeffrey Larson·May 21, 2019
Hybrid quantum-classical algorithms such as the quantum approximate optimization algorithm (QAOA) are considered one of the most promising approaches for leveraging near-term quantum computers for practical applications. Such algorithms are often imp...
Quantum and classical query complexities for generalized Simon's problem
Zhenggang Wu, Daowen Qiu, Jia-Yi Tan +2 more·May 21, 2019
Simon's problem conceived by Simon is one of the most important examples demonstrating the faster speed of quantum computers than classical computers for solving some problems, and the optimal separation between exact quantum and classical query comp...
Short-depth circuits for efficient expectation-value estimation
A. Roggero, A. Baroni·May 21, 2019
The evaluation of expectation values $Tr\left[\rho O\right]$ for some pure state $\rho$ and Hermitian operator $O$ is of central importance in a variety of quantum algorithms. Near optimal techniques developed in the past require a number of measurem...
Improving security and bandwidth efficiency of NewHope using error-correction schemes
Minki Song, Seunghwan Lee, Eunsang Lee +3 more·May 20, 2019
Among many submissions to the NIST post-quantum cryptography (PQC) project, NewHope is a promising key encapsulation mechanism (KEM) based on the Ring-Learning with errors (Ring-LWE) problem. Since the most important factors to be considered for PQC ...
Statistical Assertions for Validating Patterns and Finding Bugs in Quantum Programs
Yipeng Huang, M. Martonosi·May 20, 2019
In support of the growing interest in quantum computing experimentation, programmers need new tools to write quantum algorithms as program code. Compared to debugging classical programs, debugging quantum programs is difficult because programmers hav...
Computing the Classical-Quantum channel capacity: experiments on a Blahut-Arimoto type algorithm and an approximate solution for the binary inputs, two-dimensional outputs channel
Haobo Li, N. Cai·May 18, 2019
In our previous work, we presented a Blahut-Arimoto type algorithm for computing the discrete memoryless (DM) classical-quantum channel capacity. And the speed of convergence is analyzed. In this paper, we present numerical experiment to show that th...
Spin coherent quantum transport of electrons between defects in diamond
L. Oberg, E. Huang, P. Reddy +6 more·May 17, 2019
Abstract The nitrogen-vacancy (NV) color center in diamond has rapidly emerged as an important solid-state system for quantum information processing. Whereas individual spin registers have been used to implement small-scale diamond quantum computing,...
Probing Qubit Memory Errors at the Part-per-Million Level.
M. Sepiol, A. C. Hughes, J. E. Tarlton +7 more·May 16, 2019
Robust qubit memory is essential for quantum computing, both for near-term devices operating without error correction, and for the long-term goal of a fault-tolerant processor. We directly measure the memory error ε_{m} for a ^{43}Ca^{+} trapped-ion ...
Quantum Computing: An Overview Across the System Stack
Salonik Resch, Ulya R. Karpuzcu·May 16, 2019
Quantum computers, if fully realized, promise to be a revolutionary technology. As a result, quantum computing has become one of the hottest areas of research in the last few years. Much effort is being applied at all levels of the system stack, from...
Discrete-time quantum walk algorithm for ranking nodes on a network
Prateek Chawla, R. Mangal, C. M. Chandrashekar·May 16, 2019
We present a quantum algorithm for ranking the nodes of a network in their order of importance. The algorithm is based on a directed discrete-time quantum walk and works on all directed networks. This algorithm can theoretically be applied to the ent...
Protocol for a resonantly driven three-qubit Toffoli gate with silicon spin qubits
M. Gullans, J. Petta·May 16, 2019
The three-qubit Toffoli gate plays an important role in quantum error correction and complex quantum algorithms such as Shor's factoring algorithm, motivating the search for efficient implementations of this gate. Here we introduce a Toffoli gate sui...
A scalable quantum computing platform using symmetric-top molecules
Phelan Yu, L. Cheuk, I. Kozyryev +1 more·May 15, 2019
We propose a new scalable platform for quantum computing (QC)—an array of optically trapped symmetric-top molecules (STMs) of the alkaline earth monomethoxide (MOCH3) family. Individual STMs form qubits, and the system is readily scalable to 100–1000...
Generating Weighted MAX-2-SAT Instances of Tunable Difficulty with Frustrated Loops
Y. Pei, Haik Manukian, M. Ventra·May 14, 2019
Many optimization problems can be cast into the maximum satisfiability (MAX-SAT) form, and many solvers have been developed for tackling such problems. To evaluate a MAX-SAT solver, it is convenient to generate hard MAX-SAT instances with known solut...
Disentangling sources of quantum entanglement in quench dynamics
Lorenzo Pastori, M. Heyl, J. C. Budich·May 14, 2019
Quantum entanglement may have various origins ranging from solely interaction-driven quantum correlations to single-particle effects. Here, we explore the dependence of entanglement on (time-dependent) single-particle basis transformations in fermion...
Generation and manipulation of Schrödinger cat states in Rydberg atom arrays
Ahmed Omran, H. Levine, A. Keesling +16 more·May 14, 2019
Entanglement goes large The success of quantum computing relies on the ability to entangle large-scale systems. Various platforms are being pursued, with architectures based on superconducting qubits and trapped atoms being the most advanced. By enta...
Placing Kirkman's Schoolgirls and Quantum Spin Pairs on the Fano Plane: A Rainbow of Four Primary Colors, A Harmony of Fifteen Tones
J. P. Marceaux, A. Rau·May 14, 2019
A recreational problem from nearly two centuries ago has featured prominently in recent times in the mathematics of designs, codes, and signal processing. The number 15 that is central to the problem coincidentally features in areas of physics, espec...