Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Quantum walks over a square lattice
Arkaprabha Ghosal, P. Deb·Mar 14, 2018
Quantum random walk finds application in efficient quantum algorithms as well as in quantum network theory. Here we study the mixing time of a discrete quantum walk over a square lattice in presence percolation and decoherence. We consider bit-flip a...
Approximate quantum Fourier transform with O(n log(n)) T gates
Y. Nam, Yuan Su, D. Maslov·Mar 13, 2018
The ability to implement the Quantum Fourier Transform (QFT) efficiently on a quantum computer facilitates the advantages offered by a variety of fundamental quantum algorithms, such as those for integer factoring, computing discrete logarithm over A...
Boosting Computational Power through Spatial Multiplexing in Quantum Reservoir Computing
K. Nakajima, K. Fujii, M. Negoro +2 more·Mar 12, 2018
Quantum reservoir computing provides a framework for exploiting the natural dynamics of quantum systems as a computational resource. It can implement real-time signal processing and solve temporal machine learning problems in general, which requires ...
A Hybrid Quantum-Classical Paradigm to Mitigate Embedding Costs in Quantum Annealing
A. Abbott, Cristian S. Calude, M. Dinneen +1 more·Mar 12, 2018
Despite rapid recent progress towards the development of quantum computers capable of providing computational advantages over classical computers, it seems likely that such computers will, initially at least, be required to run in a hybrid quantum-cl...
Learning the quantum algorithm for state overlap
L. Cincio, Yiğit Subaşı, A. Sornborger +1 more·Mar 12, 2018
Short-depth algorithms are crucial for reducing computational error on near-term quantum computers, for which decoherence and gate infidelity remain important issues. Here we present a machine-learning approach for discovering such algorithms. We app...
Construction of controlled-NOT gate based on microwave-activated phase (MAP) gate in two transmon system
T. Noh, Gwanyeol Park, Soon-Gul Lee +2 more·Mar 12, 2018
We experimentally constructed an all-microwave scheme for the controlled-NOT (cNOT) gate between two superconducting transmon qubits in a three dimensional cavity. Our cNOT gate is based on the microwave-activated phase (MAP) gate, which requires an ...
Independent indistinguishable quantum light sources on a reconfigurable photonic integrated circuit
D. Ellis, A. Bennett, C. Dangel +7 more·Mar 12, 2018
We report a compact, scalable, quantum photonic integrated circuit realised by combining multiple, independent InGaAs/GaAs quantum-light-emitting-diodes (QLEDs) with a silicon oxynitride waveguide circuit. Each waveguide joining the circuit can then ...
Signature of a quantum dimensional transition in the spin- 12 antiferromagnetic Heisenberg model on a square lattice and space reduction in the matrix product state
Lihua Wang, Kwang S. Kim·Mar 10, 2018
We study the spin-$\frac{1}{2}$ antiferromagnetic Heisenberg model on an $\ensuremath{\infty}\ifmmode\times\else\texttimes\fi{}N$ square lattice for even $N$'s up to 14. Previously, the nonlinear sigma model perturbatively predicted that its spin-rot...
Simulation of Gaussian channels via teleportation and error correction of Gaussian states
S. Tserkis, Josephine Dias, T. Ralph·Mar 9, 2018
Gaussian channels are the typical way to model the decoherence introduced by the environment in continuous-variable quantum states. It is known that those channels can be simulated by a teleportation protocol using as a resource state either a maxima...
Long-lived quantum speedup based on plasmonic hot spot systems
Jun Ren, Tian Chen, Xiangdong Zhang·Mar 9, 2018
Long-lived quantum speedup serves as a fundamental component for quantum algorithms. The quantum walk is identified as an ideal scheme to realize the long-lived quantum speedup. However, one finds that the duration of quantum speedup is too short in ...
A cross-disciplinary introduction to quantum annealing-based algorithms
S. Venegas-Andraca, William Cruz-Santos, Catherine C. McGeoch +1 more·Mar 9, 2018
Abstract A central goal in quantum computing is the development of quantum hardware and quantum algorithms in order to analyse challenging scientific and engineering problems. Research in quantum computation involves contributions from both physics a...
Quantum-classical computation of Schwinger model dynamics using quantum computers
N. Klco, E. Dumitrescu, A. McCaskey +7 more·Mar 8, 2018
We present a quantum-classical algorithm to study the dynamics of the two-spatial-site Schwinger model on IBM's quantum computers. Using rotational symmetries, total charge, and parity, the number of qubits needed to perform computation is reduced by...
Improving performance of an analog electronic device using quantum error correction
Corey I. Ostrove, B. Cour, Andrew Lanham +1 more·Mar 8, 2018
The use of analog classical systems for computation is generally thought to be a difficult proposition due to the susceptibility of these devices to noise and the lack of a clear framework for achieving fault-tolerance. We present experimental result...
Quantum Coherence Measures for Quantum Switch
Marek Sawerwain, J. Wiśniewska·Mar 8, 2018
We suppose that a structure working as a quantum switch will be a significant element of future networks realizing transmissions of quantum information. In this chapter we analyze a process of switch's operating -- especially in systems with a noise ...
Estimating localizable entanglement from witnesses
D. Amaro, Markus P. Müller, A. Pal·Mar 7, 2018
Computing localizable entanglement for noisy many-particle quantum states is difficult due to the optimization over all possible sets of local projection measurements. Therefore, it is crucial to develop lower bounds, which can provide useful informa...
Comparing Zeeman qubits to hyperfine qubits in the context of the surface code: 171 Yb + and 174 Yb +
N. C. Brown, K. Brown·Mar 7, 2018
Many systems used for quantum computing possess additional states beyond those defining the qubit. Leakage out of the qubit subspace must be considered when designing quantum error correction codes. Here we consider trapped ion qubits manipulated by ...
Suppression of Qubit Crosstalk in a Tunable Coupling Superconducting Circuit
Pranav S. Mundada, Gengyan Zhang, T. Hazard +1 more·Mar 7, 2018
Parasitic crosstalk in superconducting quantum devices is a leading limitation for quantum gates. We demonstrate the suppression of static ZZ crosstalk in a two-qubit, two-coupler superconducting circuit, where the frequency of a tunable coupler can ...
Correlated randomized benchmarking
D. McKay, Andrew W. Cross, C. J. Wood +1 more·Mar 7, 2018
To improve the performance of multi-qubit algorithms on quantum devices it is critical to have methods for characterizing non-local quantum errors such as crosstalk. To address this issue, we propose and test an extension to the analysis of simultane...
High-Coherence Fluxonium Qubit
Long B. Nguyen, Yen-Hsiang Lin, A. Somoroff +3 more·Mar 7, 2018
We report superconducting fluxonium qubits with coherence times largely limited by energy relaxation and reproducibly satisfying T2 > 100 microseconds (T2 > 300 microseconds in one device). Moreover, given the state of the art values of the surface l...
Quantum-assisted cluster analysis.
F. Neukart, David Von Dollen, Christian Seidel·Mar 7, 2018
We present an algorithm for quantum-assisted cluster analysis (QACA) that makes use of the topological properties of a D-Wave 2000Q quantum processing unit (QPU). Clustering is a form of unsupervised machine learning, where instances are organized in...