Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Honeycomblike Phononic Networks of Spins with Closed Mechanical Subsystems
Xinzhu Li, M. Kuzyk, Hailin Wang·Jan 3, 2019
In a mechanical network of solid-state spins, spin qubits in adjacent mechanical resonators are coupled via vibrations. This nearest-neighbor (NN) mechanical coupling, however, can also lead to the formation of spectrally dense mechanical modes, with...
Scalable fermionic error correction in Majorana surface codes
O. Viyuela, S. Vijay, L. Fu·Dec 20, 2018
We study the error correcting properties of Majorana Surface Codes (MSC), topological quantum codes constructed out of interacting Majorana fermions, which can be used to store quantum information and perform quantum computation. These quantum memori...
Determination of Chern numbers with a phase-retrieval algorithm
Tomasz Szołdra, K. Sacha, A. Kosior·Dec 13, 2018
Ultracold atoms in optical lattices form a clean quantum simulator platform which can be utilized to examine topological phenomena and test exotic topological materials. Here we propose an experimental scheme to measure the Chern numbers of two-dimen...
The role of entropy in topological quantum error correction
M. Beverland, Benjamin J. Brown, M. Kastoryano +1 more·Dec 12, 2018
The performance of a quantum error-correction process is determined by the likelihood that a random configuration of errors introduced to the system will lead to the corruption of encoded logical information. In this work we compare two different var...
Quantum Algorithms, Architecture, and Error Correction
C. Ryan-Anderson·Dec 11, 2018
Quantum algorithms have the potential to provide exponential speedups over some of the best known classical algorithms. These speedups may enable quantum devices to solve currently intractable problems such as those in the fields of optimization, mat...
Tensor networks for complex quantum systems
R. Orús·Dec 10, 2018
Originally developed in the context of condensed-matter physics and based on renormalization group ideas, tensor networks have been revived thanks to quantum information theory and the progress in understanding the role of entanglement in quantum man...
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...
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...
Universal fault-tolerant measurement-based quantum computation
Benjamin J. Brown, Sam Roberts·Nov 28, 2018
Certain physical systems that one might consider for fault-tolerant quantum computing where qubits do not readily interact, for instance photons, are better suited for measurement-based quantum-computational protocols. We develop a framework to map f...
Quantum Engineering of Majorana Fermions
Eric Mascot, S. Cocklin, S. Rachel +1 more·Nov 16, 2018
Chiral superconductors have the ability to host topologically protected Majorana zero modes which have been proposed as future qubits for topological quantum computing. The recently introduced magnet--superconductor hybrid (MSH) systems consisting of...
Field Induced Oscillation of Two Majorana Modes in a Quantum Ring
Yue Yu, K. Szeto·Nov 14, 2018
We calculate the topological boundary modes found for quantum wire for a quantum ring. For the symmetric ring we find analytical solutions for two quasi-particles identifiable as the Majorana states and for asymmetric ring, we have also find approxim...
Fault-tolerant protection of near-term trapped-ion topological qubits under realistic noise sources
A. Bermudez, Xiaosi Xu, Mauricio Gutiérrez +3 more·Oct 22, 2018
Taking into account an increasingly realistic noise model, a low-resource toolbox of fault-tolerant quantum error detection and correction scheme is provided. By extensive numerical simulations, a thorough microscopic characterization is performed, s...
2D quantum computation with 3D topological codes
H. Bombin·Oct 22, 2018
I present a fault-tolerant quantum computing method for 2D architectures that is particularly appealing for photonic qubits. It relies on a crossover of techniques from topological stabilizer codes and measurement based quantum computation. In partic...
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...
Minimal nonorthogonal gate decomposition for qubits with limited control
Xiao-Ming Zhang, Jianan Li, Xin Wang +1 more·Oct 17, 2018
In quantum control theory, a question of fundamental and practical interest is how an arbitrary unitary transformation can be decomposed into minimum number of elementary rotations for implementation, subject to various physical constraints. Examples...
Reinforcement learning decoders for fault-tolerant quantum computation
R. Sweke, Markus S. Kesselring, E. van Nieuwenburg +1 more·Oct 16, 2018
Topological error correcting codes, and particularly the surface code, currently provide the most feasible road-map towards large-scale fault-tolerant quantum computation. As such, obtaining fast and flexible decoding algorithms for these codes, with...
Quantum Circuit Depth Lower Bounds For Homological Codes
D. Aharonov, Y. Touati·Oct 9, 2018
We provide an $\Omega(log(n))$ lower bound for the depth of any quantum circuit generating the unique groundstate of Kitaev's spherical code. No circuit-depth lower bound was known before on this code in the general case where the gates can connect q...
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...
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...
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...