Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Quantum circuit for the fast Fourier transform
Ryo Asaka, K. Sakai, Ryoko Yahagi·Nov 8, 2019
We propose an implementation of the algorithm for the fast Fourier transform (FFT) as a quantum circuit consisting of a combination of some quantum gates. In our implementation, a data sequence is expressed by a tensor product of vector spaces. Namel...
Electric circuits for universal quantum gates and quantum Fourier transformation
M. Ezawa·Nov 6, 2019
Universal quantum computation may be realized based on quantum walk, by formulating it as a scattering problem on a graph. In this paper, we simulate quantum gates through electric circuits, following a recent report that a one-dimensional $LC$ elect...
Quantum simulation by qubitization without Toffoli gates
M. Steudtner, S. Wehner·Nov 1, 2019
Qubitization is a modern approach to estimate Hamiltonian eigenvalues without simulating its time evolution. While in this way approximation errors are avoided, its resource and gate requirements are more extensive: qubitization requires additional q...
Quantum Wasserstein Generative Adversarial Networks
Shouvanik Chakrabarti, Yiming Huang, Tongyang Li +2 more·Oct 31, 2019
The study of quantum generative models is well-motivated, not only because of its importance in quantum machine learning and quantum chemistry but also because of the perspective of its implementation on near-term quantum machines. Inspired by previo...
Experimental Implementation of Universal Nonadiabatic Geometric Quantum Gates in a Superconducting Circuit.
Yuan Xu, Ziyue Hua, Tao Chen +9 more·Oct 27, 2019
Using geometric phases to realize noise-resilient quantum computing is an important method to enhance the control fidelity. In this work, we experimentally realize a universal nonadiabatic geometric quantum gate set in a superconducting qubit chain. ...
Repetitive single electron spin readout in silicon
J. Yoneda, K. Takeda, A. Noiri +5 more·Oct 25, 2019
Single electron spins confined in silicon quantum dots hold great promise as a quantum computing architecture with demonstrations of long coherence times, high-fidelity quantum logic gates, basic quantum algorithms and device scalability. While singl...
Using Spectral Graph Theory to Map Qubits onto Connectivity-limited Devices
Joseph X. Lin, E. Anschuetz, A. Harrow·Oct 25, 2019
We propose an efficient heuristic for mapping the logical qubits of quantum algorithms to the physical qubits of connectivity-limited devices, adding a minimal number of connectivity-compliant SWAP gates. In particular, given a quantum circuit, we co...
An Improved Implementation Approach for Quantum Phase Estimation on Quantum Computers
Hamed Mohammadbagherpoor, Young-Hyun Oh, P. Dreher +3 more·Oct 23, 2019
Quantum phase estimation (QPE) is one of the core algorithms for quantum computing. It has been extensively studied and applied in a variety of quantum applications such as the Shor's factoring algorithm, quantum sampling algorithms and the calculati...
A Domain-agnostic, Noise-resistant, Hardware-efficient Evolutionary Variational Quantum Eigensolver
Arthur G. Rattew, Shaohan Hu, Marco Pistoia +2 more·Oct 21, 2019
Variational quantum algorithms have shown promise in numerous fields due to their versatility in solving problems of scientific and commercial interest. However, leading algorithms for Hamiltonian simulation, such as the Variational Quantum Eigensolv...
Rapid High-Fidelity Spin-State Readout in Si / Si - Ge Quantum Dots via rf Reflectometry
Elliot J. Connors, J. Nelson, J. Nichol·Oct 19, 2019
Silicon spin qubits show great promise as a scalable qubit platform for fault-tolerant quantum computing. However, fast high-fidelity readout of charge and spin states, which is required for quantum error correction, has remained elusive. Radio-frequ...
Single-step implementation of high-fidelity n -bit Toffoli gates
S. E. Rasmussen, K. Groenland, R. Gerritsma +2 more·Oct 17, 2019
The family of $n$-bit Toffoli gates, with the two-bit Toffoli gate as the figurehead, are of great interest in quantum information as they can be used as universal gates and in quantum error correction, among other things. We present a single-step im...
AND-gates in ZX-calculus: Spider Nest Identities and QBC-completeness
Anthony Munson, B. Coecke, Quanlong Wang·Oct 15, 2019
In this paper we exploit the utility of the triangle symbol which has a complicated expression in terms of spider diagrams in ZX-calculus, and its role within the ZX-representation of AND-gates in particular. First, we derive spider nest identities w...
Computer-Inspired Concept for High-Dimensional Multipartite Quantum Gates.
Xiaoqin Gao, Manuel Erhard, A. Zeilinger +1 more·Oct 13, 2019
An open question in quantum optics is how to manipulate and control complex quantum states in an experimentally feasible way. Here we present concepts for transformations of high-dimensional multiphotonic quantum systems. The proposals rely on two ne...
Variational fast forwarding for quantum simulation beyond the coherence time
Cristina Cîrstoiu, Zoe Holmes, Joseph Iosue +3 more·Oct 9, 2019
Trotterization-based, iterative approaches to quantum simulation (QS) are restricted to simulation times less than the coherence time of the quantum computer (QC), which limits their utility in the near term. Here, we present a hybrid quantum-classic...
Robust and efficient algorithms for high-dimensional black-box quantum optimization
Z. Leng, Pranav S. Mundada, Saeed Ghadimi +1 more·Oct 8, 2019
Hybrid quantum-classical optimization using near-term quantum technology is an emerging direction for exploring quantum advantage in high-dimensional systems. However, precise characterization of all experimental parameters is often impractical and c...
Space-efficient quantum multiplication of polynomials for binary finite fields with sub-quadratic Toffoli gate count
I. V. Hoof·Oct 7, 2019
Multiplication is an essential step in a lot of calculations. In this paper we look at multiplication of 2 binary polynomials of degree at most n-1, modulo an irreducible polynomial of degree n with 2n input and n output qubits, without ancillary qub...
Resource Estimation for Quantum Variational Simulations of the Hubbard Model
Z. Cai·Oct 7, 2019
As the advances in quantum hardware bring us into the noisy intermediate-scale quantum (NISQ) era, one possible task we can perform without quantum error correction using NISQ machines is the variational quantum eigensolver (VQE) due to its shallow d...
Secure Multi-party Quantum Computation with a Dishonest Majority
Y. Dulek, A. Grilo, S. Jeffery +2 more·Sep 30, 2019
The cryptographic task of secure multi-party (classical) computation has received a lot of attention in the last decades. Even in the extreme case where a computation is performed between $k$ mutually distrustful players, and security is required eve...
Mixed algorithmic-analog simulation of many body dynamics using interaction of fixed-frequency superconducting qubits
D. Babukhin, A. Zhukov, W. Pogosov·Sep 24, 2019
In recent years there was a huge experimental progress towards the development of prototypes of algorithmic quantum processors. These quantum machines are not free from imperfections and various technological and scientific problems remain to be solv...
Number-conserving analysis of measurement-based braiding with Majorana zero modes
Christina Knapp, J. Väyrynen, R. Lutchyn·Sep 24, 2019
Majorana-based quantum computation seeks to encode information nonlocally in pairs of Majorana zero modes, thereby isolating qubit states from a local noisy environment. In addition to long coherence times, the attractiveness of Majorana-based quantu...