Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Fourier analysis of sampling from noisy chaotic quantum circuits
S. Boixo, V. Smelyanskiy, H. Neven·Aug 6, 2017
Sampling from the output distribution of chaotic quantum evolutions, and of pseudo-random universal quantum circuits in particular, has been proposed as a prominent milestone for near-term quantum supremacy. The same paper notes that chaotic distribu...
The upside of noise: engineered dissipation as a resource in superconducting circuits
E. Kapit·Aug 2, 2017
Historically, noise in superconducting circuits has been considered an obstacle to be removed. A large fraction of the research effort in designing superconducting circuits has focused on noise reduction, with great success, as coherence times have i...
Performance of five-qubit code for arbitrary error channels
Long Huang, Xiaohua Wu, T. Zhou·Jul 31, 2017
In quantum error correction, it is an important assumption that errors on different qubits are independent. In our previous work [Phys. Rev. A {\bf 92}, 052320 (2015)], the generality of the concatenated five-qubit code has been investgated when nois...
Quantum machine learning: a classical perspective
C. Ciliberto, M. Herbster, Alessandro Davide Ialongo +4 more·Jul 26, 2017
Recently, increased computational power and data availability, as well as algorithmic advances, have led machine learning (ML) techniques to impressive results in regression, classification, data generation and reinforcement learning tasks. Despite t...
Can Chaotic Quantum Circuits Maintain Quantum Supremacy under Noise
M. Yung, Xun Gao·Jun 27, 2017
Although the emergence of a fully-functional quantum computer may still be far away from today, in the near future, it is possible to have medium-size, special-purpose, quantum devices that can perform computational tasks not efficiently simulable wi...
Efficient universal quantum channel simulation in IBM’s cloud quantum computer
Shijie Wei, T. Xin, G. Long·Jun 25, 2017
The study of quantum channels is an important field and promises a wide range of applications, because any physical process can be represented as a quantum channel that transforms an initial state into a final state. Inspired by the method of perform...
Adaptive recurrence quantum entanglement distillation for two-Kraus-operator channels
Liangzhong Ruan, Wenhan Dai, M. Win·Jun 22, 2017
Quantum entanglement serves as a valuable resource for many important quantum operations. A pair of entangled qubits can be shared between two agents by first preparing a maximally entangled qubit pair at one agent, and then sending one of the qubits...
Fault-tolerance thresholds for the surface code with fabrication errors
J. Auger, H. Anwar, Mercedes Gimeno-Segovia +2 more·Jun 15, 2017
The construction of topological error correction codes requires the ability to fabricate a lattice of physical qubits embedded on a manifold with a non-trivial topology such that the quantum information is encoded in the global degrees of freedom (i....
Experimental quantum verification in the presence of temporally correlated noise
S. Mavadia, C. Edmunds, Cornelius Hempel +4 more·Jun 12, 2017
Growth in the capabilities of quantum information hardware mandates access to techniques for performance verification that function under realistic laboratory conditions. Here we experimentally characterise the impact of common temporally correlated ...
Achieving the Heisenberg limit in quantum metrology using quantum error correction
Sisi Zhou, Mengzhen Zhang, J. Preskill +1 more·Jun 8, 2017
Quantum metrology has many important applications in science and technology, ranging from frequency spectroscopy to gravitational wave detection. Quantum mechanics imposes a fundamental limit on measurement precision, called the Heisenberg limit, whi...
Practical integer-to-binary mapping for quantum annealers
S. Karimi, Pooya Ronagh·Jun 6, 2017
Recent advancements in quantum annealing hardware and numerous studies in this area suggest that quantum annealers have the potential to be effective in solving unconstrained binary quadratic programming problems. Naturally, one may desire to expand ...
Mechanical on-chip microwave circulator
Shabir Barzanjeh, M. Wulf, M. Peruzzo +4 more·Jun 1, 2017
Nonreciprocal circuit elements form an integral part of modern measurement and communication systems. Mathematically they require breaking of time-reversal symmetry, typically achieved using magnetic materials and more recently using the quantum Hall...
Machine-learning-assisted correction of correlated qubit errors in a topological code
P. Baireuther, T. O’Brien, B. Tarasinski +1 more·May 22, 2017
A fault-tolerant quantum computation requires an efficient means to detect and correct errors that accumulate in encoded quantum information. In the context of machine learning, neural networks are a promising new approach to quantum error correction...
Quantum Error Correction with Only Two Extra Qubits.
R. Chao, B. Reichardt·May 5, 2017
Noise rates in quantum computing experiments have dropped dramatically, but reliable qubits remain precious. Fault-tolerance schemes with minimal qubit overhead are therefore essential. We introduce fault-tolerant error-correction procedures that use...
Topological quantum error correction in the Kitaev honeycomb model
Yi-Chan Lee, Courtney G. Brell, S. Flammia·May 3, 2017
The Kitaev honeycomb model is an approximate topological quantum error correcting code in the same phase as the toric code, but requiring only a 2-body Hamiltonian. As a frustrated spin model, it is well outside the commuting models of topological qu...
Noise in one-dimensional measurement-based quantum computing
N. Usher, D. Browne·Apr 24, 2017
Measurement-Based Quantum Computing (MBQC) is an alternative to the quantum circuit model, whereby the computation proceeds via measurements on an entangled resource state. Noise processes are a major experimental challenge to the construction of a q...
Autonomous calibration of single spin qubit operations
Florian Frank, Thomas Unden, J. Zoller +5 more·Apr 21, 2017
Fully autonomous precise control of qubits is crucial for quantum information processing, quantum communication, and quantum sensing applications. It requires minimal human intervention on the ability to model, to predict, and to anticipate the quant...
Adaptive quantum metrology under general Markovian noise
R. Demkowicz-Dobrzański, J. Czajkowski, J. Czajkowski +1 more·Apr 20, 2017
We consider a general model of unitary parameter estimation in presence of Markovian noise, where the parameter to be estimated is associated with the Hamiltonian part of the dynamics. In absence of noise, unitary parameter can be estimated with prec...
Coherence as resource in scattering quantum walk search on complete graph
Yun-Long Su, Siyuan Liu, Xiao-Hui Wang +2 more·Apr 17, 2017
We investigate the behavior of coherence in scattering quantum walk search on complete graph under the condition that the total number of vertices of the graph is significantly larger than the marked number of vertices we are searching, N ≫ v. We fin...
Hardware-efficient variational quantum eigensolver for small molecules and quantum magnets
A. Kandala, Antonio Mezzacapo, K. Temme +4 more·Apr 17, 2017
Quantum computers can be used to address electronic-structure problems and problems in materials science and condensed matter physics that can be formulated as interacting fermionic problems, problems which stretch the limits of existing high-perform...