Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Hartree-Fock on a superconducting qubit quantum computer
F. Arute, K. Arya, R. Babbush +78 more·Apr 8, 2020
Twelve-qubit quantum computing for chemistry Accurate electronic structure calculations are considered one of the most anticipated applications of quantum computing that will revolutionize theoretical chemistry and other related fields. Using the Goo...
Quantum approximate optimization of non-planar graph problems on a planar superconducting processor
F. Arute, K. Arya, R. Babbush +81 more·Apr 8, 2020
Faster algorithms for combinatorial optimization could prove transformative for diverse areas such as logistics, finance and machine learning. Accordingly, the possibility of quantum enhanced optimization has driven much interest in quantum technolog...
Resource-Optimized Fermionic Local-Hamiltonian Simulation on Quantum Computer for Quantum Chemistry
Qingfeng Wang, Ming Li, C. Monroe +1 more·Apr 8, 2020
The ability to simulate a fermionic system on a quantum computer is expected to revolutionize chemical engineering, materials design, nuclear physics, to name a few. Thus, optimizing the simulation circuits is of significance in harnessing the power ...
Exponentially faster implementations of Select(H) for fermionic Hamiltonians
Kianna Wan·Apr 8, 2020
We present a simple but general framework for constructing quantum circuits that implement the multiply-controlled unitary $\text{Select}(H) \equiv \sum_\ell |\ell\rangle\langle\ell|\otimes H_\ell$, where $H = \sum_\ell H_\ell$ is the Jordan-Wigner t...
Universal topological quantum computation with strongly correlated Majorana edge modes
Ye-Min Zhan, Yuge Chen, Bin Chen +3 more·Apr 7, 2020
Majorana-based quantum gates are not complete for performing universal topological quantum computation while Fibonacci-based gates are difficult to be realized electronically and hardly coincide with the conventional quantum circuit models. In refere...
Constructing clock-transition-based two-qubit gates from dimers of molecular nanomagnets
C. A. Collett, P. Santini, S. Carretta +1 more·Apr 7, 2020
A good qubit must have a coherence time long enough for gate operations to be performed. Avoided level crossings allow for clock transitions in which coherence is enhanced by the insensitivity of the transition to fluctuations in external fields. Bec...
Classical Optimizers for Noisy Intermediate-Scale Quantum Devices
W. Lavrijsen, Ana Tudor, Juliane Müller +2 more·Apr 6, 2020
We present a collection of optimizers tuned for usage on Noisy Intermediate-Scale Quantum (NISQ) devices. Optimizers have a range of applications in quantum computing, including the Variational Quantum Eigensolver (VQE) and Quantum Approximate Optimi...
T-count and Qubit Optimized Quantum Circuit Designs of Carry Lookahead Adder
H. Thapliyal, Edgard Muñoz-Coreas, Vladislav Khalus·Apr 4, 2020
Quantum circuits of arithmetic operations such as addition are needed to implement quantum algorithms in hardware. Quantum circuits based on Clifford+T gates are used as they can be made tolerant to noise. The tradeoff of gaining fault tolerance from...
Single-electron control in a foundry-fabricated two-dimensional qubit array
Fabio Ansaloni, A. Chatterjee, H. Bohuslavskyi +4 more·Apr 2, 2020
Silicon spin qubits have achieved high-fidelity one- and two-qubit gates, above error correction thresholds, promising an industrial route to fault-tolerant quantum computation. A significant next step for the development of scalable multi-qubit proc...
Grover on SIMON\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\,SIMON\,$$\end{document}
Ravi Anand, Arpita Maitra, S. Mukhopadhyay·Apr 1, 2020
For any symmetric key cryptosystem with n-bit secret key, the key can be recovered in O(2n/2)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} ...
Implementation of Geometric Quantum Gates on Microwave‐Driven Semiconductor Charge Qubits
Chengxian Zhang, Tao Chen, Xin Wang +1 more·Apr 1, 2020
A semiconductor‐based charge qubit, confined in double quantum dots, can be a platform to implement quantum computing. However, it suffers severely from charge noises. Here, a theoretical framework to implement universal geometric quantum gates in th...
Tunable Quantum Neural Networks for Boolean Functions
Viet Pham Ngoc, H. Wiklicky·Mar 31, 2020
In this paper we propose a new approach to quantum neural networks. Our multi-layer architecture avoids the use of measurements that usually emulate the non-linear activation functions which are characteristic of the classical neural networks. Despit...
Circuit optimization of Hamiltonian simulation by simultaneous diagonalization of Pauli clusters
E. Berg, K. Temme·Mar 30, 2020
Many applications of practical interest rely on time evolution of Hamiltonians that are given by a sum of Pauli operators. Quantum circuits for exact time evolution of single Pauli operators are well known, and can be extended trivially to sums of co...
A Roadmap for Automating the Selection of Quantum Computers for Quantum Algorithms
Marie Olivia Salm, Johanna Barzen, Uwe Breitenbucher +3 more·Mar 30, 2020
Quantum computing can enable a variety of breakthroughs in research and industry in the future. Although some quantum algorithms already exist that show a theoretical speedup compared to the best known classical algorithms, the implementation and exe...
A Hybrid Quantum-Classical Approach to Mitigating Measurement Errors in Quantum Algorithms
Hyeokjea Kwon, J. Bae·Mar 27, 2020
When noisy intermediate scalable quantum (NISQ) devices are applied in information processing, all of the stages through preparation, manipulation, and measurement of multipartite qubit states contain various types of noise that are generally hard to...
Entanglement production and convergence properties of the variational quantum eigensolver
Andreas J. C. Woitzik, P. Barkoutsos, F. Wudarski +2 more·Mar 27, 2020
We perform a systematic investigation of variational forms (wave function Ansatze), to determine the ground state energies and properties of two-dimensional model fermionic systems on triangular lattices (with and without periodic boundary conditions...
Realising and compressing quantum circuits with quantum reservoir computing
Sanjib Ghosh, Tanjung Krisnanda, T. Paterek +1 more·Mar 21, 2020
Quantum computers require precise control over parameters and careful engineering of the underlying physical system. In contrast, neural networks have evolved to tolerate imprecision and inhomogeneity. Here, using a reservoir computing architecture w...
Hadamard-Free Circuits Expose the Structure of the Clifford Group
S. Bravyi, D. Maslov·Mar 20, 2020
The Clifford group plays a central role in quantum randomized benchmarking, quantum tomography, and error correction protocols. Here we study the structural properties of this group. We show that any Clifford operator can be uniquely written in the c...
Elimination of unwanted qubit interactions for parametric exchange two-qubit gates in a tunable coupling circuit
X. Han, T. Cai, X. Li +6 more·Mar 19, 2020
We experimentally demonstrate a simple-design tunable coupler, achieving a continuous tunability for eliminating unwanted qubit interactions. We implement two-qubit iSWAP gate by applying a fast-flux bias modulation pulse on the coupler to turn on pa...
A Phononic Bus for Coherent Interfaces Between a Superconducting Quantum Processor, Spin Memory, and Photonic Quantum Networks
T. Neuman, M. Eichenfield, Matthew E. Trusheim +3 more·Mar 18, 2020
We introduce a method for high-fidelity quantum state transduction between a superconducting microwave qubit and the ground state spin system of a solid-state artificial atom, mediated via an acoustic bus connected by piezoelectric transducers. Appli...