Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
The quantum version of the shifted power method and its application in quadratic binary optimization
A. Daskin·Sep 5, 2018
In this paper, we present a direct quantum adaptation of the classical shifted power method. The method is very similar to the iterative phase estimation algorithm; however, it does not require any initial estimate of an eigenvector and as in the cla...
A programmable three-qubit superconducting processor with all-to-all connectivity
Tanay Roy, Sumeru Hazra, S. Kundu +3 more·Sep 3, 2018
Superconducting circuits are at the forefront of quantum computing technology because of the unparalleled combination of good coherence, fast gates and flexibility in design parameters. The majority of experiments demonstrating small quantum algorith...
Gate Teleportation-based Universal Blind Quantum Computation
Xiaoqian Zhang·Sep 1, 2018
Blind quantum computation (BQC) allows that a client who has limited quantum abilities can delegate quantum computation to a server who has advanced quantum technologies but learns nothing about the client's private information. For example, measurem...
Fluctuations of Energy-Relaxation Times in Superconducting Qubits.
P. Klimov, J. Kelly, Z. Chen +30 more·Aug 31, 2018
Superconducting qubits are an attractive platform for quantum computing since they have demonstrated high-fidelity quantum gates and extensibility to modest system sizes. Nonetheless, an outstanding challenge is stabilizing their energy-relaxation ti...
Phase-Modulated Entangling Gates Robust to Static and Time-Varying Errors
A. Milne, C. Edmunds, Cornelius Hempel +3 more·Aug 30, 2018
Entangling operations are among the most important primitive gates employed in quantum computing and it is crucial to ensure high-fidelity implementations as systems are scaled up. We experimentally realize and characterize a simple scheme to minimiz...
Single-photon heralded two-qubit unitary gates for pairs of nitrogen-vacancy centers in diamond
Chenxu Liu, M. Dutt, D. Pekker·Aug 29, 2018
The implementation of a high-fidelity two-qubit quantum logic gate remains an outstanding challenge for isolated solid-state qubits such as Nitrogen-Vacancy (NV) centers in diamond. In this work, we show that by driving pairs of NV centers to undergo...
Logical measurement-based quantum computation in circuit-QED
J. Joo, Chang-Woo Lee, S. Kono +1 more·Aug 23, 2018
We propose a new scheme of measurement-based quantum computation (MBQC) using an error-correcting code against photon-loss in circuit quantum electrodynamics. We describe a specific protocol of logical single-qubit gates given by sequential cavity me...
Low overhead quantum computation using lattice surgery
A. Fowler, C. Gidney·Aug 20, 2018
When calculating the overhead of a quantum algorithm made fault-tolerant using the surface code, many previous works have used defects and braids for logical qubit storage and state distillation. In this work, we show that lattice surgery reduces the...
A programmable two-qubit solid-state quantum processor under ambient conditions
Yang Wu, Ya Wang, X. Qin +2 more·Aug 17, 2018
Quantum computers, which take advantage of the superposition and entanglement of physical states, could outperform their classical counterparts in solving problems with technological impact such as factoring large numbers and searching databases. A q...
Neural-network states for the classical simulation of quantum computing
Bjarni J'onsson, B. Bauer, Giuseppe Carleo·Aug 15, 2018
Simulating quantum algorithms with classical resources generally requires exponential resources. However, heuristic classical approaches are often very efficient in approximately simulating special circuit structures, for example with limited entangl...
Benchmarks for approximate CNOTs based on a 17-Qubit Surface Code
Andreas Peter, D. Loss, James R. Wootton·Aug 12, 2018
Scalable and fault-tolerant quantum computation will require error correction. This will demand constant measurement of many-qubit observables, implemented using a vast number of CNOT gates. Indeed, practically all operations performed by a fault-tol...
Low rank representations for quantum simulation of electronic structure
M. Motta, Erika Ye, J. McClean +4 more·Aug 8, 2018
The quantum simulation of quantum chemistry is a promising application of quantum computers. However, for N molecular orbitals, the O(N4)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb...
Fast and Scalable Quantum Information Processing with Two‐Electron Atoms in Optical Tweezer Arrays
G. Pagano, F. Scazza, M. Foss-Feig·Aug 7, 2018
Atomic systems, ranging from trapped ions to ultracold and Rydberg atoms, offer unprecedented control over both internal and external degrees of freedom at the single‐particle level. They are considered among the foremost candidates for realizing qua...
Optimization of Circuits for IBM's Five-Qubit Quantum Computers
G. Dueck, A. Pathak, M. Rahman +2 more·Aug 1, 2018
IBM has made several quantum computers available to researchers around the world via cloud services. Two architectures with five qubits, one with 16, and one with 20 qubits are available to run experiments. The IBM architectures implement gates from ...
Practical and reliable error bars for quantum process tomography
L. P. Thinh, P. Faist, J. Helsen +2 more·Aug 1, 2018
Current techniques in quantum process tomography typically return a single point estimate of an unknown process based on a finite albeit large amount of measurement data. Due to statistical fluctuations, however, other processes close to the point es...
Simulation of quantum circuits by low-rank stabilizer decompositions
S. Bravyi, D. Browne, Padraic Calpin +3 more·Aug 1, 2018
Recent work has explored using the stabilizer formalism to classically simulate quantum circuits containing a few non-Clifford gates. The computational cost of such methods is directly related to the notion of stabilizerrank, which for a pure state ψ...
Machine learning method for state preparation and gate synthesis on photonic quantum computers
J. Arrazola, T. Bromley, J. Izaac +3 more·Jul 27, 2018
We show how techniques from machine learning and optimization can be used to find circuits of photonic quantum computers that perform a desired transformation between input and output states. In the simplest case of a single input state, our method d...
Network architecture for a topological quantum computer in silicon
B. Buonacorsi, Z. Cai, E. B. Ramirez +7 more·Jul 26, 2018
A design for a large-scale surface code quantum processor based on a node/network approach is introduced for semiconductor quantum dot spin qubits. The minimal node contains only seven quantum dots, and nodes are separated on the micron scale, creati...
Direct Randomized Benchmarking for Multiqubit Devices.
T. Proctor, Arnaud Carignan-Dugas, K. Rudinger +3 more·Jul 20, 2018
Benchmarking methods that can be adapted to multiqubit systems are essential for assessing the overall or "holistic" performance of nascent quantum processors. The current industry standard is Clifford randomized benchmarking (RB), which measures a s...
Passive, deterministic photonic conditional-phase gate via two-level systems
William Konyk, J. Gea-Banacloche·Jul 19, 2018
Photons are one of the best carriers of quantum information, as they interact only weakly with the environment, and photon processes are fast and efficient. Despite these advantages, two main issues have prevented alloptical quantum computing from be...