Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Hard combinatorial problems and minor embeddings on lattice graphs
A. Lucas·Dec 5, 2018
Today, hardware constraints are an important limitation on quantum adiabatic optimization algorithms: Computational problems are formulated as quadratic unconstrained binary optimization (QUBO) in the presence of noisy coupling constants, and the int...
Masking quantum information in multipartite scenario
Mao-Sheng Li, Yan-Ling Wang·Dec 5, 2018
Recently, Kavan Modi \emph{et al.} found that masking quantum information is impossible in bipartite scenario in [Phys. Rev. Lett. \textbf{120}, 230501 (2018)]. This adds another item of the no-go theorems. In this paper, we present some new schemes ...
High-Threshold Code for Modular Hardware With Asymmetric Noise
Xiaosi Xu, Qi Zhao, Xiao Yuan +1 more·Dec 4, 2018
We consider an approach to fault tolerant quantum computing based on a simple error detecting code operating as the substrate for a conventional surface code. We develop a customised decoder to process the information about the likely location of err...
Large stark tuning of InAs/InP quantum dots
S. Aghaeimeibodi, Chang-Min Lee, M. A. Buyukkaya +2 more·Dec 4, 2018
InAs/InP quantum dots are excellent sources of telecom single-photon emission and are among the most promising candidates for scalable quantum photonic circuits. However, geometric differences in each quantum dot leads to slightly different emission ...
Quantum Teleportation of Shared Quantum Secret.
Sang Min Lee, Seung-Woo Lee, Hyunseok Jeong +1 more·Dec 3, 2018
Quantum teleportation is a fundamental building block of quantum communications and quantum computations, transferring quantum states between distant physical entities. In the context of quantum secret sharing, the teleportation of quantum informatio...
Topological order on the Bloch sphere
R. Liss, T. Mor, R. Orús·Dec 3, 2018
A Bloch sphere is the geometrical representation of an arbitrary two-dimensional Hilbert space. Possible classes of entanglement and separability for the pure and mixed states on the Bloch sphere were suggested by [Boyer et al 2017 PRA 95 032 308]. H...
Trading T gates for dirty qubits in state preparation and unitary synthesis
G. Low, V. Kliuchnikov, L. Schaeffer·Dec 3, 2018
Efficient synthesis of arbitrary quantum states and unitaries from a universal fault-tolerant gate-set e.g. Clifford+T is a key subroutine in quantum computation. As large quantum algorithms feature many qubits that encode coherent quantum informatio...
Hamiltonian quantum computing with superconducting qubits
A. Ciani, B. Terhal, D. DiVincenzo·Dec 2, 2018
We consider how the Hamiltonian Quantum Computing scheme introduced in (2016 New J. Phys. 18 023042) can be implemented using a 2D array of superconducting transmon qubits. We show how the scheme requires the engineering of strong attractive cross-Ke...
A Logic for Recursive Quantum Programs
Zhaowei Xu, M. Ying, Shenggang Ying·Dec 2, 2018
Most modern (classical) programming languages support recursion. Recursion has also been successfully applied to the design of several quantum algorithms and introduced in a couple of quantum programming languages. So, it can be expected that recursi...
Vector Generation of Quantum Contextual Sets in Even Dimensional Hilbert Spaces
M. Pavičić, N. Megill·Dec 1, 2018
Recently, quantum contextuality has been proved to be the source of quantum computation’s power. That, together with multiple recent contextual experiments, prompts improving the methods of generation of contextual sets and finding their features. Th...
Quantum Approximate Optimization Algorithm: Performance, Mechanism, and Implementation on Near-Term Devices
Leo Zhou, Sheng-Tao Wang, Soonwon Choi +2 more·Dec 1, 2018
The Quantum Approximate Optimization Algorithm (QAOA) is a hybrid quantum-classical variational algorithm designed to tackle combinatorial optimization problems. Despite its promise for near-term quantum applications, not much is currently understood...
Classical Simulation of Quantum Circuits by Half Gauss Sums
Kaifeng Bu, Dax Enshan Koh·Dec 1, 2018
We give an efficient algorithm to evaluate a certain class of exponential sums, namely the periodic, quadratic, multivariate half Gauss sums. We show that these exponential sums become #P\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{...
Validating quantum computers using randomized model circuits
Andrew W. Cross, L. Bishop, S. Sheldon +2 more·Dec 1, 2018
We introduce a single-number metric, quantum volume, that can be measured using a concrete protocol on near-term quantum computers of modest size ($n\ensuremath{\lesssim}50$), and measure it on several state-of-the-art transmon devices, finding value...
Towards scalable silicon quantum computing
M. Vinet, L. Hutin, B. Bertrand +20 more·Dec 1, 2018
We report the efforts and challenges dedicated towards building a scalable quantum computer based on Si spin qubits. We review the advantages of relying on devices fabricated in a thin film technology as their properties can be in situ tuned by the b...
Optimal control of interacting quantum systems based on the first-order Magnus approximation: Application to multiple dipole-dipole coupled molecular rotors
Andrew Ma, Alicia B. Magann, T. Ho +1 more·Nov 30, 2018
We develop a methodology for performing approximate optimal control simulations for quantum systems with multiple interacting degrees of freedom. The quantum dynamics are modeled using the first-order Magnus approximation in the interaction picture, ...
Comparing Neural Network Based Decoders for the Surface Code
Savvas Varsamopoulos, K. Bertels, C. G. Almudéver·Nov 29, 2018
Matching algorithms can be used for identifying errors in quantum systems, being the most famous the Blossom algorithm. Recent works have shown that small distance quantum error correction codes can be efficiently decoded by employing machine learnin...
Quantum error correction for the toric code using deep reinforcement learning
Philip Andreasson, J. Johansson, S. Liljestrand +1 more·Nov 29, 2018
We implement a quantum error correction algorithm for bit-flip errors on the topological toric code using deep reinforcement learning. An action-value Q-function encodes the discounted value of moving a defect to a neighboring site on the square grid...
Scalar quantum field theories as a benchmark for near-term quantum computers
Kubra Yeter-Aydeniz, E. Dumitrescu, A. McCaskey +3 more·Nov 29, 2018
Quantum field theory (QFT) simulations are a potentially important application for noisy intermediate scale quantum (NISQ) computers. The ability of a quantum computer to emulate a QFT, therefore, constitutes a natural application-centric benchmark. ...
Variational Thermal Quantum Simulation via Thermofield Double States.
Jingxiang Wu, T. Hsieh·Nov 28, 2018
We present a variational approach for quantum simulators to realize finite temperature Gibbs states by preparing thermofield double (TFD) states. Our protocol is motivated by the quantum approximate optimization algorithm and involves alternating tim...
Cryogenic Characerization and Modeling of Standard CMOS down to Liquid Helium Temperature for Quantum Computing
Zhen Li, C. Luo, Tengteng Lu +3 more·Nov 28, 2018
Cryogenic characterization and modeling of 0.18um CMOS technology (1.8V and 5V) are presented in this paper. Several PMOS and NMOS transistors with different width to length ratios(W/L) were extensively characterized under various bias conditions at ...