Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Enhanced Framework of Quantum Approximate Optimization Algorithm and Its Parameter Setting Strategy
Mingyou Wu, Zhihao Liu, Hanwu Chen·Dec 16, 2020
An enhanced framework of quantum approximate optimization algorithm (QAOA) is introduced and the parameter setting strategies are analyzed. The enhanced QAOA is as effective as the QAOA but exhibits greater computing power and flexibility, and with p...
Early fault-tolerant simulations of the Hubbard model
E. Campbell·Dec 16, 2020
Simulation of the Hubbard model is a leading candidate for the first useful applications of a fault-tolerant quantum computer. A recent study of quantum algorithms for early simulations of the Hubbard model [Kivlichan et al 2019 Quantum 4 296] found ...
Dynamically Corrected Nonadiabatic Holonomic Quantum Gates
Sai Li, Z. Xue·Dec 16, 2020
The key for realizing fault-tolerant quantum computation lies in maintaining the coherence of all the qubits so that high-fidelity and robust qubit manipulations can be achievable. One of the promising approaches is to use geometric phases in the con...
Initial Design of a W-Band Superconducting Kinetic Inductance Qubit
F. Faramarzi, P. Day, J. Glasby +7 more·Dec 15, 2020
Superconducting qubits are widely used in quantum computing research and industry. We describe a superconducting kinetic inductance qubit (and introduce the term Kineticon to describe it) operating at W-band frequencies with a nonlinear nanowire sect...
Optimal quantum simulation of open quantum systems
Pragati Gupta, C. M. Chandrashekar·Dec 14, 2020
Digital quantum simulation on quantum systems require algorithms that can be implemented using finite quantum resources. Recent studies have demonstrated digital quantum simulation of open quantum systems on Noisy Intermediate-Scale Quantum (NISQ) de...
Learning from Physics Experiments with Quantum Computers: Applications in Muon Spectroscopy
Sam McArdle·Dec 11, 2020
Computational physics is an important tool for analysing, verifying, and -- at times -- replacing physical experiments. Nevertheless, simulating quantum systems and analysing quantum data has so far resisted an efficient classical treatment in full g...
Variational quantum algorithms for trace distance and fidelity estimation
Ranyiliu Chen, Zhixin Song, Xuanqiang Zhao +1 more·Dec 10, 2020
Estimating the difference between quantum data is crucial in quantum computing. However, as typical characterizations of quantum data similarity, the trace distance and quantum fidelity are believed to be exponentially-hard to evaluate in general. In...
Stochastic Quantum Circuit Simulation Using Decision Diagrams
Thomas Grurl, R. Kueng, Jürgen Fuß +1 more·Dec 10, 2020
Recent years have seen unprecedented advance in the design and control of quantum computers. Nonetheless, their applicability is still restricted and access remains expensive. Therefore, a substantial amount of quantum algorithms research still relie...
Resilience of Quantum Random Access Memory to Generic Noise
Connor T. Hann, Gideon Lee, S. Girvin +1 more·Dec 9, 2020
Quantum random access memory (QRAM)--memory which stores classical data but allows queries to be performed in superposition--is required for the implementation of numerous quantum algorithms. While naive implementations of QRAM are highly susceptible...
The Role of Symmetry in Quantum Query-to-Communication Simulation
Sourav Chakraborty, A. Chattopadhyay, Peter Høyer +3 more·Dec 9, 2020
Buhrman, Cleve and Wigderson (STOC'98) showed that for every Boolean function f : {-1,1}^n to {-1,1} and G in {AND_2, XOR_2}, the bounded-error quantum communication complexity of the composed function f o G equals O(Q(f) log n), where Q(f) denotes t...
Z2 lattice gauge theories and Kitaev's toric code: A scheme for analog quantum simulation
Lukas Homeier, C. Schweizer, M. Aidelsburger +2 more·Dec 9, 2020
Kitaev's toric code is an exactly solvable model with $\mathbb{Z}_2$-topological order, which has potential applications in quantum computation and error correction. However, a direct experimental realization remains an open challenge. Here, we propo...
Variational quantum simulations of stochastic differential equations
K. Kubo, Yuya O. Nakagawa, Suguru Endo +1 more·Dec 8, 2020
Stochastic differential equations (SDE), which models uncertain phenomena as the time evolution of random variables, are exploited in various fields of natural and social sciences such as finance. Since SDEs rarely admit analytical solutions and must...
Quantum Error Correction Thresholds for the Universal Fibonacci Turaev-Viro Code
Alexis Schotte, Guanyu Zhu, Lander Burgelman +1 more·Dec 8, 2020
We consider a two-dimensional quantum memory of qubits on a torus which encode the extended Fibonacci string-net code, and devise strategies for error correction when those qubits are subjected to depolarizing noise. Building on the concept of tube a...
Quantum Technology for Economists
Isaiah Hull, Or Sattath, E. Diamanti +1 more·Dec 8, 2020
Research on quantum technology spans multiple disciplines: physics, computer science, engineering, and mathematics. The objective of this manuscript is to provide an accessible introduction to this emerging field for economists that is centered aroun...
Variational preparation of finite-temperature states on a quantum computer
R. Sagastizabal, S. Premaratne, B. Klaver +13 more·Dec 7, 2020
The preparation of thermal equilibrium states is important for the simulation of condensed matter and cosmology systems using a quantum computer. We present a method to prepare such mixed states with unitary operators and demonstrate this technique e...
Foundations for Near-Term Quantum Natural Language Processing
B. Coecke, G. Felice, K. Meichanetzidis +1 more·Dec 7, 2020
We provide conceptual and mathematical foundations for near-term quantum natural language processing (QNLP), and do so in quantum computer scientist friendly terms. We opted for an expository presentation style, and provide references for supporting ...
Tensor Network Quantum Simulator With Step-Dependent Parallelization
Danylo Lykov, R. Schutski, A. Galda +2 more·Dec 4, 2020
In this work, we present a new large-scale quantum circuit simulator. It is based on the tensor network contraction technique to represent quantum circuits. We propose a novel parallelization algorithm based on step-dependent slicing . In this paper,...
Quantum Circuits for Collective Amplitude Damping in Two-Qubit Systems.
Y. Hama·Dec 4, 2020
Quantum computers have now appeared in our society and are utilized for the investigation of science and engineering. At present, they have been built as intermediate-size computers containing about fifty qubits and are weak against noise effects. He...
CutQC: using small Quantum computers for large Quantum circuit evaluations
Wei Tang, T. Tomesh, Jeffrey Larson +2 more·Dec 3, 2020
Quantum computing (QC) is a new paradigm offering the potential of exponential speedups over classical computing for certain computational problems. Each additional qubit doubles the size of the computational state space available to a QC algorithm. ...
Recycling qubits in near-term quantum computers
Galit Anikeeva, Isaac H. Kim, P. Hayden·Dec 3, 2020
Quantum computers are capable of efficiently contracting unitary tensor networks, a task that is likely to remain difficult for classical computers. For instance, networks based on matrix product states or the multi-scale entanglement renormalization...