Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Semidefinite programming hierarchies for constrained bilinear optimization
M. Berta, Francesco Borderi, Omar Fawzi +1 more·Oct 29, 2018
We give asymptotically converging semidefinite programming hierarchies of outer bounds on bilinear programs of the form Tr[H(D⊗E)]\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usep...
Variational quantum state diagonalization
Ryan Larose, Arkin Tikku, É. O’Neel-Judy +2 more·Oct 24, 2018
Variational hybrid quantum-classical algorithms are promising candidates for near-term implementation on quantum computers. In these algorithms, a quantum computer evaluates the cost of a gate sequence (with speedup over classical cost evaluation), a...
Generalized Ramsey interferometry explored with a single nuclear spin qudit
C. Godfrin, R. Ballou, E. Bonet +4 more·Oct 24, 2018
Qudits, with their state space of dimension d > 2, open fascinating experimental prospects. The quantum properties of their states provide new potentialities for quantum information, quantum contextuality, expressions of geometric phases, facets of q...
Emulating quantum computation with artificial neural networks.
Christian Pehle, K. Meier, M. Oberthaler +1 more·Oct 24, 2018
We demonstrate, that artificial neural networks (ANN) can be trained to emulate single or multiple basic quantum operations. In order to realize a quantum state, we implement a novel "quantumness gate" that maps an arbitrary matrix to the real repres...
Quantum control of an oscillator using a stimulated Josephson nonlinearity
A. Vrajitoarea, Ziwen Huang, Peter Groszkowski +2 more·Oct 23, 2018
Superconducting circuits extensively rely on the Josephson junction as a nonlinear electronic element for manipulating quantum information and mediating photon interactions. Despite continuing efforts in pushing the coherence of Josephson circuits, t...
Efficiently measuring a quantum device using machine learning
D. Lennon, H. Moon, L. Camenzind +6 more·Oct 23, 2018
Scalable quantum technologies such as quantum computers will require very large numbers of quantum devices to be characterised and tuned. As the number of devices on chip increases, this task becomes ever more time-consuming, and will be intractable ...
Digital quantum simulation of hadronization in Yang–Mills theory
De-Sheng Li, Chun-wang Wu, Ming Zhong +2 more·Oct 22, 2018
A quantum algorithm of SU(N) Yang-Mills theory is formulated in terms of quantum circuits. It can nonperturbatively calculate the Dyson series and scattering amplitudes with polynomial complexity. The gauge fields in the interaction picture are discr...
Quantum error correction with the semion code
G. Dauphinais, L. Ortiz, S. Varona +1 more·Oct 19, 2018
We present a full quantum error correcting procedure with the semion code: an off-shell extension of the double-semion model. We construct open-string operators that recover the quantum memory from arbitrary errors and closed-string operators that im...
Holographic quantum information and (de)confinement
A. Patrascu·Oct 18, 2018
Analysing the phenomenon of deconfinement from a holographic point of view, it appears that the brane configuration in the bulk, corresponding to the confinement phase imposes a restriction on the strength of the holographic quantum error correction ...
Chip-Integrated Voltage Sources for Control of Trapped Ions
J. Stuart, R. Panock, C. Bruzewicz +5 more·Oct 16, 2018
Trapped-ion quantum information processors offer many advantages for achieving high-fidelity operations on a large number of qubits, but current experiments require bulky external equipment for classical and quantum control of many ions. We demonstra...
Topographic Representation for Quantum Machine Learning
B. MacLennan·Oct 13, 2018
This paper proposes a brain-inspired approach to quantum machine learning with the goal of circumventing many of the complications of other approaches. The fact that quantum processes are unitary presents both opportunities and challenges. A principa...
Error Estimation at the Information Reconciliation Stage of Quantum Key Distribution
E. Kiktenko, A. O. Malyshev, A. A. Bozhedarov +3 more·Oct 13, 2018
Quantum key distribution (QKD) offers a practical solution for secure communication between two distinct parties via a quantum channel and an authentic public channel. In this work, we consider different approaches to the quantum bit error rate (QBER...
Integration of quantum dots with lithium niobate photonics
S. Aghaeimeibodi, B. Desiatov, Je‐Hyung Kim +7 more·Oct 12, 2018
The integration of quantum emitters with integrated photonics enables complex quantum photonic circuits that are necessary for photonic implementation of quantum simulators, computers, and networks. Thin-film lithium niobate is an ideal material subs...
Probing Context-Dependent Errors in Quantum Processors
K. Rudinger, T. Proctor, Dylan Langharst +3 more·Oct 12, 2018
Gates in error-prone quantum information processors are often modeled using sets of one- and two-qubit process matrices, the standard model of quantum errors. However, the results of quantum circuits on real processors often depend on additional exte...
Delegating Quantum Computation in the Quantum Random Oracle Model
Jiayu Zhang·Oct 11, 2018
A delegation scheme allows a computationally weak client to use a server's resources to help it evaluate a complex circuit without leaking any information about the input (other than its length) to the server. In this paper, we consider delegation sc...
Demonstration of Controlled-Phase Gates between Two Error-Correctable Photonic Qubits.
Yuan Xu, Yuwei Ma, W. Cai +11 more·Oct 10, 2018
To realize fault-tolerant quantum computing, it is necessary to store quantum information in logical qubits with error correction functions, realized by distributing a logical state among multiple physical qubits or by encoding it in the Hilbert spac...
Quantum convolutional neural networks
Iris Cong, Soonwon Choi, M. Lukin·Oct 9, 2018
Neural network-based machine learning has recently proven successful for many complex applications ranging from image recognition to precision medicine. However, its direct application to problems in quantum physics is challenging due to the exponent...
Graph comparison via nonlinear quantum search
M. Chiew, K. de Lacy, C. Yu +2 more·Oct 3, 2018
Graph comparison is an established NP-hard problem. In this paper, we present an efficiently scaling quantum algorithm which finds the size of the maximum common edge subgraph for any pair of unlabelled graphs and thus provides a meaningful measure o...
Topological protection of two-photon quantum correlation on a photonic chip
Yao Wang, Xiao-Ling Pang, Yong-Heng Lu +4 more·Oct 2, 2018
Low-decoherence regime plays a key role in constructing multi-particle quantum systems and has therefore been constantly pursued in order to build quantum simulators and quantum computers in a scalable fashion. Quantum error correction and quantum to...
Superconducting qubit circuit emulation of a vector spin-1/2
A. Kerman·Oct 2, 2018
We propose a superconducting qubit that fully emulates a quantum spin-1/2, with an effective vector dipole moment whose three components obey the commutation relations of an angular momentum in the computational subspace. Each of these components of ...