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
Random walk on the Bloch sphere realized by a simultaneous feedback and feed-forward control in a superconducting Xmon qubit system.
Liang Xiang, Z. Zong, Zhenhai Sun +9 more·Sep 22, 2019
Measurement-based feedback control is central in quantum computing and precise quantum control. Here we realize a fast and flexible field-programmable-gate-array-based feedback control in a superconducting Xmon qubit system. The latency of room-tempe...
Error suppression in adiabatic quantum computing with qubit ensembles
Naeimeh Mohseni, Marek Narozniak, A. Pyrkov +3 more·Sep 22, 2019
Incorporating protection against quantum errors into adiabatic quantum computing (AQC) is an important task due to the inevitable presence of decoherence. Here, we investigate an error-protected encoding of the AQC Hamiltonian, where qubit ensembles ...
Electric field spectroscopy of material defects in transmon qubits
J. Lisenfeld, A. Bilmes, A. Megrant +6 more·Sep 21, 2019
Superconducting integrated circuits have demonstrated a tremendous potential to realize integrated quantum computing processors. However, the downside of the solid-state approach is that superconducting qubits suffer strongly from energy dissipation ...
A Multilayer Network Approach to Quantum Computing
P. Sakkaris, R. Sudhakaran·Sep 21, 2019
The circuit model of quantum computation is reformulated as a multilayer network theory [3] called a Quantum Multiverse Network (QuMvN). The QuMvN formulation allows us to interpret the quantum wave function as a combination of ergodic Markov Chains ...
Efficient simulation of open quantum systems coupled to a fermionic bath
Alexander Nusseler, Ish Dhand, S. Huelga +1 more·Sep 20, 2019
We present and analyze the fermionic time evolving density matrix using orthogonal polynomials algorithm (fTEDOPA), which enables the numerically exact simulation of open quantum systems coupled to a fermionic environment. The method allows for simul...
Post Quantum Cryptography Analysis of TLS Tunneling on a Constrained Device
Jon Barton, W. Buchanan, Nikolaos Pitropakis +2 more·Sep 20, 2019
Advances in quantum computing make Shor's algorithm for factorising numbers ever more tractable. This threatens the security of any cryptographic system which often relies on the difficulty of factorisation. It also threatens methods based on discret...
Modeling and Designing Routing Protocols in Quantum Networks
Shouqian Shi, Chen Qian·Sep 20, 2019
Quantum networks enable a number of important applications such as quantum key distribution. The basic function of a quantum network is to enable long-distance quantum entanglement between two remote communication parties. This work focuses on the en...
Hybrid kernel polynomial method
M. Irfan, Sathish R. Kuppuswamy, D. Varjas +4 more·Sep 20, 2019
The kernel polynomial method allows to sample overall spectral properties of a quantum system, while sparse diagonalization provides accurate information about a few important states. We present a method combining these two approaches without loss of...
Optimal preparation of the $W$ state for qubits with XY coupling
Dalton Jones, Armin Rahmani·Sep 20, 2019
Using simulated annealing, we find optimal protocols that evolve a simple product state into a three-qubit $W$ state with a Hamiltonian that describes XY coupling and single-qubit gates, and determine the associated quantum speed limit. Applying Pont...
Scalable quantum computing with qudits on a graph
E. Kiktenko, Anna Sergeevna Nikolaeva, P. Xu +2 more·Sep 19, 2019
We show a significant reduction of the number of quantum operations and the improvement of the circuit depth for the realization of the Toffoli gate by using qudits. This is done by establishing a general relation between the dimensionality of qudits...
Efficient evaluation of Pauli strings with entangled measurements
Ikko Hamamura, T. Imamichi·Sep 19, 2019
The advent of cloud quantum computing accelerates development of quantum algorithms. In particular, it is essential to study variational quantum-classical hybrid algorithms, which are executable on Noisy Intermediate-Scale Quantum (NISQ) computers. E...
An Adaptive Optimizer for Measurement-Frugal Variational Algorithms
Jonas M. Kübler, A. Arrasmith, L. Cincio +1 more·Sep 19, 2019
Variational hybrid quantum-classical algorithms (VHQCAs) have the potential to be useful in the era of near-term quantum computing. However, recently there has been concern regarding the number of measurements needed for convergence of VHQCAs. Here, ...
A non-orthogonal variational quantum eigensolver
W. Huggins, Joonho Lee, Unpil Baek +2 more·Sep 19, 2019
Variational algorithms for strongly correlated chemical and materials systems are one of the most promising applications of near-term quantum computers. We present an extension to the variational quantum eigensolver that approximates the ground state...
Quantum Filter Diagonalization: Quantum Eigendecomposition without Full Quantum Phase Estimation
R. Parrish, P. McMahon·Sep 19, 2019
We develop a quantum filter diagonalization method (QFD) that lies somewhere between the variational quantum eigensolver (VQE) and the phase estimation algorithm (PEA) in terms of required quantum circuit resources and conceptual simplicity. QFD uses...
Hybrid quantum error correction in qubit architectures
L. B. Kristensen, M. Kjaergaard, C. K. Andersen +1 more·Sep 19, 2019
Noise and errors are inevitable parts of any practical implementation of a quantum computer. As a result, large-scale quantum computation will require ways to detect and correct errors on quantum information. Here, we present such a quantum error cor...
The magneto-optics in quantum wires comprised of vertically stacked quantum dots: A calling for the magnetoplasmon qubits
M. Kushwaha·Sep 18, 2019
A deeper sense of advantages over the planar quantum dots and the foreseen applications in the single-electron devices and quantum computation have given vertically stacked quantum dots (VSQD) a width of interest. Here, we embark on the collective ex...
Variational quantum simulation of ultrastrong light-matter coupling
A. Di Paolo, P. Barkoutsos, I. Tavernelli +1 more·Sep 18, 2019
We propose the simulation of quantum-optical systems in the ultrastrong-coupling regime using a variational quantum algorithm. More precisely, we introduce a short-depth variational form to prepare the groundstate of the multimode Dicke model on a qu...
Fault-tolerant quantum error correction on near-term quantum processors using flag and bridge qubits
L. Lao, C. G. Almudéver·Sep 17, 2019
Fault-tolerant (FT) computation by using quantum error correction (QEC) is essential for realizing large-scale quantum algorithms. Devices are expected to have enough qubits to demonstrate aspects of fault tolerance in the near future. However, these...
Adiabatic Quantum Kitchen Sinks for Learning Kernels Using Randomized Features.
M. Noori, Seyed Shakib Vedaie, Inderpreet Singh +4 more·Sep 17, 2019
Quantum information processing is likely to have far-reaching impact in the field of artificial intelligence. While the race to build an error-corrected quantum computer is ongoing, noisy, intermediate-scale quantum (NISQ) devices provide an immediat...
Autotuning of double dot devices in situ with machine learning.
J. P. Zwolak, T. McJunkin, Sandesh S. Kalantre +7 more·Sep 17, 2019
The current practice of manually tuning quantum dots (QDs) for qubit operation is a relatively time-consuming procedure that is inherently impractical for scaling up and applications. In this work, we report on the in situ implementation of a recentl...