Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Mixed algorithmic-analog simulation of many body dynamics using interaction of fixed-frequency superconducting qubits
D. Babukhin, A. Zhukov, W. Pogosov·Sep 24, 2019
In recent years there was a huge experimental progress towards the development of prototypes of algorithmic quantum processors. These quantum machines are not free from imperfections and various technological and scientific problems remain to be solv...
On the need for large Quantum depth
Nai-Hui Chia, Kai-Min Chung, C. Lai·Sep 23, 2019
Near-term quantum computers are likely to have small depths due to short coherence time and noisy gates. A natural approach to leverage these quantum computers is interleaving them with classical computers. Understanding the capabilities and limits o...
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 ...
Optimal preparation of the maximally entangled W state of three superconducting gmon qubits
Dalton Jones, Armin Rahmani·Sep 20, 2019
Superconducting gmon qubits allow for highly tuneable quantum computing devices. Optimally controlled evolution of these systems is of considerable interest. We determine the optimal dynamical protocols for the generation of the maximally entangled W...
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...
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...
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...
Ultracold polar molecules as qudits
Rahul Sawant, J. A. Blackmore, P. D. Gregory +6 more·Sep 16, 2019
We discuss how the internal structure of ultracold molecules, trapped in the motional ground state of optical tweezers, can be used to implement qudits. We explore the rotational, fine and hyperfine structure of 40Ca19F and 87Rb133Cs, which are examp...
Comprehending robust quantum effects in organic semiconductors: Charge-transfer excitons, aggregate phonons and fractons
Yao Yao·Sep 15, 2019
In organic semiconductors working under ambient circumstance, there are remarkable quantum effects lack of comprehensive understanding, and an exotic composite particle named charge transfer (CT) exciton is normally regarded as the key ingredient. An...
Error-transparent operations on a logical qubit protected by quantum error correction
Y. Ma, Yang Xu, X. Mu +8 more·Sep 15, 2019
Universal quantum computation1 is striking for its unprecedented capability in processing information, but its scalability is challenging in practice because of the inevitable environment noise. Although quantum error correction (QEC) techniques2–8 h...
Quantum computing with multidimensional continuous-variable cluster states in a scalable photonic platform
Bo-Han Wu, R. N. Alexander, Shuai Liu +1 more·Sep 12, 2019
Quantum computing is a disruptive paradigm widely believed to be capable of solving classically intractable problems. However, the route toward full-scale quantum computers is obstructed by immense challenges associated with the scalability of the pl...
Cayley path and quantum computational supremacy: A proof of average-case #P-hardness of Random Circuit Sampling with quantified robustness
R. Movassagh·Sep 11, 2019
A one-parameter unitary-valued interpolation between any two unitary matrices is constructed based on the Cayley transformation, which extends our work. The entries of the interpolated unitaries are shown to be low-degree rational functions in the pa...
Exact and Practical Pattern Matching for Quantum Circuit Optimization
Raban Iten, Romain Moyard, Tony Metger +2 more·Sep 11, 2019
Quantum computations are typically performed as a sequence of basic operations, called quantum gates. Different gate sequences, called quantum circuits, can implement the same overall quantum computation. Since every additional quantum gate takes tim...
Optimizing Clifford gate generation for measurement-only topological quantum computation with Majorana zero modes
Alan Tran, Alex Bocharov, B. Bauer +1 more·Sep 6, 2019
One of the main challenges for quantum computation is that while the number of gates required to perform a non-trivial quantum computation may be very large, decoherence and errors in realistic quantum architectures limit the number of physical gate ...
Effects of Quantum Noise on Quantum Approximate Optimization Algorithm
Cheng 程 Xue 薛, Z. Chen 陈, Y. Wu 吴 +1 more·Sep 5, 2019
The quantum-classical hybrid algorithm is a promising algorithm with respect to demonstrating the quantum advantage in noisy-intermediate-scale quantum (NISQ) devices. When running such algorithms, effects due to quantum noise are inevitable. In our ...
Optimal Quantum Control with Poor Statistics
F. Sauvage, F. Mintert·Sep 3, 2019
Learning how to control a quantum system based on experimental data can help us to exceed the limitations imposed by theoretical modelling. Due to the intrinsic probabilistic nature of quantum mechanics, it is fundamentally necessary to repeat measur...
Methods for Measuring Magnetic Flux Crosstalk between Tunable Transmons
D. Abrams, N. Didier, S. Caldwell +2 more·Aug 30, 2019
In the gate model of quantum computing, a program is typically decomposed into a sequence of 1- and 2-qubit gates that are realized as control pulses acting on the system. A key requirement for a scalable control system is that the qubits are address...
2D Qubit Placement of Quantum Circuits Using LONGPATH
Mrityunjay Ghosh, Nivedita Dey, D. Mitra +1 more·Aug 29, 2019
In order to achieve speedup over conventional classical computing for finding solution of computationally hard problems, quantum computing was introduced. Quantum algorithms can be simulated in a pseudo quantum environment, but implementation involve...
Quantum-classical hybrid algorithm using an error-mitigating N -representability condition to compute the Mott metal-insulator transition
Scott E. Smart, D. Mazziotti·Aug 28, 2019
Quantum algorithms for molecular electronic structure have been developed with lower computational scaling than their classical counterparts, but emerging quantum hardware is far from being capable of the coherence,connectivity and gate errors requir...
Short-depth trial-wavefunctions for the variational quantum eigensolver based on the problem Hamiltonian
G. Salis, N. Moll·Aug 26, 2019
For the variational quantum eigensolver we propose to generate trial wavefunctions from a small amount of selected Pauli terms of the problem Hamiltonian. Two different approaches, one inspired by the quantum approximate optimization algorithm and th...