Papers
Live trends in quantum computing research, updated daily from arXiv.
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15,749 papers in 12 months (-37% vs prior quarter)
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Flag Fault-Tolerant Error Correction for any Stabilizer Code
R. Chao, B. Reichardt·Dec 19, 2019
Conventional fault-tolerant quantum error-correction schemes require a number of extra qubits that grows linearly with the code's maximum stabilizer generator weight. For some common distance-three codes, the recent "flag paradigm" uses just two extr...
Decoherence in Molecular Electron Spin Qubits: Insights from Quantum Many-Body Simulations.
Jia Chen, Cong Hu, J. Stanton +3 more·Dec 19, 2019
Quantum states are described by wave functions whose phases cannot be directly measured, but which play a vital role in quantum effects such as interference and entanglement. The loss of the relative phase information, termed decoherence, arises from...
Enhanced connectivity of quantum hardware with digital-analog control
Asier Galicia, Borja Ramon, E. Solano +1 more·Dec 19, 2019
Quantum computers based on superconducting circuits are experiencing a rapid development, aiming at outperforming classical computers in certain useful tasks in the near future. However, the currently available chip fabrication technologies limit the...
Quantum transfer component analysis for domain adaptation
Xi He, Chufan Lyu, Min-Hsiu Hsieh +1 more·Dec 19, 2019
Domain adaptation, a crucial sub-field of transfer learning, aims to utilize known knowledge of one data set to accomplish tasks on another data set. In this paper, we perform one of the most representative domain adaptation algorithms, transfer comp...
Introduction of spin centers in single crystals of Ba2CaWO6−δ
Mekhola Sinha, Tyler J. Pearson, Tim R. Reeder +4 more·Dec 18, 2019
Developing the field of quantum information science (QIS) hinges upon designing viable qubits, the smallest unit in quantum computing. One approach to creating qubits is introducing paramagnetic defects into semiconductors or insulators. This class o...
Quantum Searchable Encryption for Cloud Data Based on Full-Blind Quantum Computation
Wenjie Liu, Yinsong Xu, Wenjie Liu +2 more·Dec 18, 2019
Searchable encryption (SE) is a positive way to protect users sensitive data in cloud computing setting, while preserving search ability on the server side, i.e., it allows the server to search encrypted data without leaking information about the pla...
Trapping Alkaline Earth Rydberg Atoms Optical Tweezer Arrays.
Jack Wilson, Samuel Saskin, Y. Meng +4 more·Dec 18, 2019
Neutral atom qubits with Rydberg-mediated interactions are a leading platform for developing large-scale coherent quantum systems. In the majority of experiments to date, the Rydberg states are not trapped by the same potential that confines ground s...
Quantum natural gradient generalized to noisy and nonunitary circuits
Bálint Koczor, S. Benjamin·Dec 18, 2019
Variational quantum algorithms are promising tools whose efficacy depends on their optimisation method. For noise-free unitary circuits, the quantum generalisation of natural gradient descent has been introduced and shown to be equivalent to imaginar...
A Theory of Trotter Error
Andrew M. Childs, Yuan Su, Minh C. Tran +2 more·Dec 18, 2019
The Lie-Trotter formula, together with its higher-order generalizations, provides a direct approach to decomposing the exponential of a sum of operators. Despite significant effort, the error scaling of such product formulas remains poorly understood...
Improved quantum algorithm for the random subset sum problem
Yang Li, Hongbo Li·Dec 18, 2019
Solving random subset sum instances plays an important role in constructing cryptographic systems. For the random subset sum problem, in 2013 Bernstein et al. proposed a quantum algorithm with heuristic time complexity $\widetilde{O}(2^{0.241n})$, wh...
Driven-dissipative quantum mechanics on a lattice: Describing a fermionic reservoir with the master equation and simulating it on a quantum computer
L. Re, Brian Rost, A. Kemper +1 more·Dec 17, 2019
The driven-dissipative many-body problem remains one of the most challenging unsolved problems in quantum mechanics. The advent of quantum computers may provide a unique platform for efficiently simulating such driven-dissipative systems. But there a...
QuESTlink—Mathematica embiggened by a hardware-optimised quantum emulator
Tyson Jones, S. Benjamin·Dec 17, 2019
We introduce QuESTlink,pronounced ‘quest link’, an open-source Mathematicapackage which efficiently emulates quantum computers. By integratingwith the Quantum Exact Simulation Toolkit (QuEST), QuESTlink offers ahigh-level, expressive and usable inter...
Transfer learning in hybrid classical-quantum neural networks
A. Mari, T. Bromley, J. Izaac +2 more·Dec 17, 2019
We extend the concept of transfer learning, widely applied in modern machine learning algorithms, to the emerging context of hybrid neural networks composed of classical and quantum elements. We propose different implementations of hybrid transfer le...
Optimised fast gates for quantum computing with trapped ions
Evan P. G. Gale, Z. Mehdi, L. Oberg +3 more·Dec 17, 2019
We present an efficient approach to optimising pulse sequences for implementing fast entangling two-qubit gates on trapped ion quantum information processors. This a two-phase procedure for optimising gate fidelity. The first phase involves a global ...
Computing eigenvalues of matrices in a quantum computer
Changpeng Shao·Dec 17, 2019
Eigenproblem arises in a large number of disciplines of sciences and engineering. Combining quantum algorithms to solve linear differential equations, quantum singular value estimation and quantum phase estimation, we propose quantum algorithms to co...
Applications of near-term photonic quantum computers: software and algorithms
T. Bromley, J. Arrazola, S. Jahangiri +7 more·Dec 16, 2019
Gaussian boson sampling (GBS) is a near-term platform for photonic quantum computing. Recent efforts have led to the discovery of GBS algorithms with applications to graph-based problems, point processes, and molecular vibronic spectra in chemistry. ...
Variational Quantum Circuits for Quantum State Tomography
Yong Liu, Dongyang Wang, Shichuan Xue +9 more·Dec 16, 2019
Quantum state tomography is a key process in most quantum experiments. In this work, we employ quantum machine learning for state tomography. Given an unknown quantum state, it can be learned by maximizing the fidelity between the output of a variati...
Efficient Computation of the Waiting Time and Fidelity in Quantum Repeater Chains
Sebastiaan Brand, T. Coopmans, David Elkouss·Dec 16, 2019
Quantum communication enables a host of applications that cannot be achieved by classical communication means, with provably secure communication as one of the prime examples. The distance that quantum communication schemes can cover via direct commu...
Performance and error modeling of Deutsch's algorithm in IBM Q
Efrain Buksman, A. Oliveira, Carolina Allende·Dec 16, 2019
The performance of quantum computers today can be studied by analyzing theeect of errors in the result of simple quantum algorithms. The modeling and char-acterization of these errors is relevant to correct them, for example, with quantumcorrecting c...
Quantum processing with ensembles of rare-earth ions in a stoichiometric crystal
R. Ahlefeldt, M. Pearce, M. Hush +1 more·Dec 16, 2019
We describe a method for creating small quantum processors in a crystal stoichiometric in an optically active rare-earth ion. The crystal is doped with another rare earth, creating an ensemble of identical clusters of surrounding ions, whose optical ...