Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Propagation of microwave photons along a synthetic dimension
Nathan R. A. Lee, M. Pechal, E. Alex Wollack +3 more·Aug 27, 2019
The evenly-spaced modes of an electromagnetic resonator are coupled to each other by appropriate time-modulation, leading to dynamics analogous to those of particles hopping between different sites of a lattice. This substitution of a real spatial di...
Training the quantum approximate optimization algorithm without access to a quantum processing unit
Michael Streif, M. Leib·Aug 23, 2019
In this paper, we eliminate the classical outer learning loop of the quantum approximate optimization algorithm (QAOA) and present a strategy to find good parameters for QAOA based on topological arguments of the problem graph and tensor network tech...
Computational universality of symmetry-protected topologically ordered cluster phases on 2D Archimedean lattices
Austin K. Daniel, R. N. Alexander, A. Miyake·Jul 31, 2019
What kinds of symmetry-protected topologically ordered (SPTO) ground states can be used for universal measurement-based quantum computation in a similar fashion to the 2D cluster state? 2D SPTO states are classified not only by global on-site symmetr...
Scalable characterization of localizable entanglement in noisy topological quantum codes
D. Amaro, M. Muller, A. Pal·Jul 30, 2019
Topological quantum error correcting codes have emerged as leading candidates towards the goal of achieving large-scale fault-tolerant quantum computers. However, quantifying entanglement in these systems of large size in the presence of noise is a c...
Spin-2 BEC spinor superfluid soliton-soliton scattering in one and two space dimensions.
Jasper Taylor, Steven Smith, J. Yepez·Jul 30, 2019
Presented is a study of a spin-2 Bose-Einstein condensate (BEC) by unitary quantum simulations of time-dependent soliton-soliton scattering. The quantum simulation method is based on a quantum lattice algorithm which is designed for implementation on...
Exponential suppression of bit-flips in a qubit encoded in an oscillator
R. Lescanne, M. Villiers, T. Peronnin +6 more·Jul 26, 2019
A quantum system interacts with its environment—if ever so slightly—no matter how much care is put into isolating it1. Therefore, quantum bits undergo errors, putting dauntingly difficult constraints on the hardware suitable for quantum computation2....
Set of holonomic and protected gates on topological qubits for a realistic quantum computer
A. Klots, L. Ioffe·Jul 9, 2019
In recent years qubit designs such as transmons approached the fidelities of up to 0.999. However, even these devices are still insufficient for realizing quantum error correction requiring better than 0.9999 fidelity. Topologically protected superco...
Hamiltonian learning for quantum error correction
Agnes Valenti, Evert P L van Nieuwenburg, S. Huber +1 more·Jul 4, 2019
The efficient validation of quantum devices is critical for emerging technological applications. In a wide class of use-cases the precise engineering of a Hamiltonian is required both for the implementation of gate-based quantum information processin...
Deterministic generation of a two-dimensional cluster state
M. V. Larsen, Xueshi Guo, Casper R. Breum +2 more·Jun 20, 2019
Generating large-scale cluster states The development of a practical quantum computer requires universality, scalability, and fault tolerance. Although much progress is being made in circuit platforms in which arrays of qubits are addressed and manip...
OpenSurgery for Topological Assemblies
A. Paler, A. Fowler·Jun 19, 2019
Surface quantum error-correcting codes are the leading proposal for fault-tolerance within quantum computers. We present OpenSurgery, a scalable tool for the preparation of circuits protected by the surface code operated through lattice surgery. Latt...
One-dimensional error-correcting code for Majorana qubits
John P. T. Stenger, Roger S. K. Mong·Jun 5, 2019
Although Majorana platforms are promising avenues to realizing topological quantum computing, they are still susceptible to errors from thermal noise and other sources. We show that the error rate of Majorana qubits can be drastically reduced using a...
Neural ensemble decoding for topological quantum error-correcting codes
Milap Sheth, S. Jafarzadeh, Vlad Gheorghiu·May 7, 2019
Topological quantum error-correcting codes are a promising candidate for building fault-tolerant quantum computers. Decoding topological codes optimally, however, is known to be a computationally hard problem. Various decoders have been proposed that...
Coherent spin transport through helical edge states of topological insulator
R. Niyazov, D. Aristov, V. Kachorovskii·Apr 29, 2019
We study coherent spin transport through helical edge states of topological insulator tunnel-coupled to metallic leads. We demonstrate that unpolarized incoming electron beam acquires finite polarization after transmission through such a setup provid...
Measurement-only quantum computation with Floquet Majorana corner modes
R. W. Bomantara, J. Gong·Apr 5, 2019
Majorana modes, typically arising at the edges of one-dimensional topological superconductors, are considered to be a promising candidate for encoding nonlocal qubits in fault-tolerant quantum computing. Here we exploit the two-dimensional geometry o...
Entangling spins in double quantum dots and Majorana bound states
Marko J. Ranvci'c, S. Hoffman, C. Schrade +2 more·Feb 26, 2019
We study the coupling between a singlet-triplet qubit realized in a double quantum dot to a topological qubit realized by spatially well-separated Majorana bound states. We demonstrate that the singlet-triplet qubit can be leveraged for readout of th...
Quantum error-detection at low energies
Martina Gschwendtner, Robert Koenig, Burak Şahinoğlu +1 more·Feb 6, 2019
Motivated by the close relationship between quantum error-correction, topological order, the holographic AdS/CFT duality, and tensor networks, we initiate the study of approximate quantum error-detecting codes in matrix product states (MPS). We first...
Quantum Associative Memory in Hep Track Pattern Recognition
I. Shapoval, P. Calafiura·Jan 29, 2019
We have entered the Noisy Intermediate-Scale Quantum Era. A plethora of quantum processor prototypes allow evaluation of potential of the Quantum Computing paradigm in applications to pressing computational problems of the future. Growing data input ...
Parallelized quantum error correction with fracton topological codes
Benjamin J. Brown, D. Williamson·Jan 23, 2019
Fracton topological phases have a large number of materialized symmetries that enforce a rigid structure on their excitations. Remarkably, we find that the symmetries of a quantum error-correcting code based on a fracton phase enable us to design dec...
Neural Decoder for Topological Codes using Pseudo-Inverse of Parity Check Matrix
C. Chinni, Abhishek Kulkarni, Dheeraj M. Pai +2 more·Jan 21, 2019
Recent developments in the field of deep learning have motivated many researchers to apply these methods to problems in quantum information. Torlai and Melko first proposed a decoder for surface codes based on neural networks. Since then, many other ...
Machine learning topological phases in real space
N. L. Holanda, M. Griffith·Jan 7, 2019
We develop a supervised machine learning algorithm that is able to learn topological phases of finite condensed-matter systems from bulk data in real lattice space. The algorithm employs diagonalization in real space together with any supervised lear...