Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
FeynmanPAQS: a graphical interface program for photonic analog quantum computing
Hao Tang, Yan-Yan Zhu, Jun Gao +3 more·Oct 4, 2018
Abstract. We present a user-friendly software for photonic analog quantum computing with a graphical user interface (GUI) that allows for convenient operation without requiring programming skills. Hamiltonians can be flexibly set by either importing ...
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...
Wavelength assignment in quantum access networks with hybrid wireless-fiber links
S. Bahrani, Osama Elmabrok, Guillermo Curr'as-Lorenzo +1 more·Oct 3, 2018
We propose a low-complexity near-optimal wavelength allocation technique for quantum key distribution access networks that rely on wavelength division multiple access. Such networks would allow users to send quantum and classical signals simultaneous...
Simulating the out-of-equilibrium dynamics of local observables by trading entanglement for mixture
J. Surace, M. Piani, L. Tagliacozzo·Oct 2, 2018
The fact that the computational cost of simulating a many-body quantum system on a computer increases with the amount of entanglement has been considered as the major bottleneck for simulating its out-of-equilibrium dynamics. Some aspects of the dyna...
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 ...
Density-Matrix Simulation of Logical Qubit using 3-qubit Quantum Error Correction Code
Chungheon Baek, T. Ostuka, S. Tarucha +1 more·Oct 2, 2018
Fault-tolerant quantum computing demands many qubits with long lifetimes to conduct accurate quantum gate operations. However, external noise limits the computing time of physical qubits. Quantum error correction codes may extend such limits, but imp...
A Novel Algebraic Geometry Compiling Framework for Adiabatic Quantum Computations
Raouf Dridi, H. Alghassi, S. Tayur·Oct 2, 2018
Adiabatic Quantum Computing (AQC) is an attractive paradigm for solving hard integer polynomial optimization problems. Available hardware restricts the Hamiltonians to be of a structure that allows only pairwise interactions. This requires that the 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...
Classical benchmarking of Gaussian Boson Sampling on the Titan supercomputer
Brajesh Gupt, J. Arrazola, N. Quesada +1 more·Oct 1, 2018
Gaussian Boson Sampling (GBS) is a model of photonic quantum computing where single-mode squeezed states are sent through linear-optical interferometers and measured using single-photon detectors. In this work, we employ a recent exact sampling algor...
A New Cryptosystem Based on Positive Braids
Xiaoming Chen, Weiqing You, Meng Jiao +3 more·Oct 1, 2018
The braid group is an important non commutative group, at the same time, it is an important tool in quantum field theory with better topological structure, and often used as a res-earch carrier for anti-quantum cryptographic algorithms. This paper pr...
Two-qubit mixed states and teleportation fidelity: purity, concurrence, and beyond
Sumit Nandi, C. Datta, Arpan Das +1 more·Oct 1, 2018
To explore the properties of a two-qubit mixed state, we consider quantum teleportation. The fidelity of a teleported state depends on the resource state purity and entanglement, as characterized by concurrence. Concurrence and purity are functions o...
Error correction in quantum cryptography based on artificial neural networks
Marcin Niemiec·Oct 1, 2018
Intensive work on quantum computing has increased interest in quantum cryptography in recent years. Although this technique is characterized by a very high level of security, there are still challenges that limit the widespread use of quantum key dis...
A unified theory of variational and quantum Monte Carlo methods and beyond
Mohammad-Sadegh Vaezi, Abolhassan Vaezi·Oct 1, 2018
We present a unified theory of the variational Monte Carlo (VMC) and determinant quantum Monte Carlo (DQMC) methods using a novel density matrix formulation of VMC. We introduce an efficient algorithm for VMC to compute correlation functions and expe...
Robustness of the concatenated quantum error-correction protocol against noise for channels affected by fluctuation
Long Huang, Xiaohua Wu, T. Zhou·Sep 30, 2018
In quantum error correction, the description of noise channel cannot be completely accurate, and fluctuation always appears in noise channel. It is found that when fluctuation of physical noise channel is considered, the average effective channel is ...
Quantum encoded quantum evolutionary algorithm for the design of quantum circuits
G. Krylov, M. Lukac·Sep 28, 2018
In this paper we present Quanrum Encoded Quantum Evolutionary Algorithm (QEQEA) and compare its performance against a a classical GPU accelerated Genetic Algorithm (GPUGA). The proposed QEQEA differs from existing quantum evolutionary algorithms in s...
Quantum error correction with the toric Gottesman-Kitaev-Preskill code
Christophe Vuillot, H. Asasi, Yang Wang +2 more·Sep 28, 2018
We examine the performance of the single-mode Gottesman-Kitaev-Preskill (GKP) code and its concatenation with the toric code for a noise model of Gaussian shifts, or displacement errors. We show how one can optimize the tracking of errors in repeated...
Strongly Coupled Single-Quantum-Dot–Cavity System Integrated on a CMOS-Processed Silicon Photonic Chip
A. Osada, Y. Ota, R. Katsumi +3 more·Sep 28, 2018
Quantum photonic integrated circuit (QPIC) is a promising tool for constructing integrated devices for quantum technology applications. In the optical regime, silicon photonics empowered by complementary-metal-oxide-semiconductor (CMOS) technology pr...
Statistical mechanical models for quantum codes with correlated noise
Christopher T. Chubb, S. Flammia·Sep 27, 2018
We give a broad generalisation of the mapping, originally due to Dennis, Kitaev, Landahl and Preskill, from quantum error correcting codes to statistical mechanical models. We show how the mapping can be extended to arbitrary stabiliser or subsystem ...
Granular aluminium as a superconducting material for high-impedance quantum circuits
L. Grünhaupt, M. Spiecker, D. Gusenkova +9 more·Sep 27, 2018
Superconducting quantum information processing machines are predominantly based on microwave circuits with relatively low characteristic impedance, about 100 Ω, and small anharmonicity, which can limit their coherence and logic gate fidelity1,2. A pr...
Probabilistic eigensolver with a trapped-ion quantum processor
Jingning Zhang, I. Arrazola, J. Casanova +3 more·Sep 27, 2018
Preparing the eigenstate, especially the ground state, of a complex Hamiltonian is of great importance in quantum simulations. Many proposals have been introduced and experimentally realized, among which are quantum variational eigensolver and heat-b...