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
Spin-controlled generation of indistinguishable and distinguishable photons from silicon vacancy centres in silicon carbide
N. Morioka, Charles Babin, R. Nagy +17 more·Jan 8, 2020
Quantum systems combining indistinguishable photon generation and spin-based quantum information processing are essential for remote quantum applications and networking. However, identification of suitable systems in scalable platforms remains a chal...
Quantum subspace alignment for domain adaptation
Xi He, Xiaoting Wang·Jan 8, 2020
Domain adaptation (DA) is used for adaptively obtaining labels of an unprocessed data set with a given related, but different labelled data set. Subspace alignment (SA), a representative DA algorithm, attempts to find a linear transformation to align...
Variational Quantum Algorithms for the Steady States of Open Quantum Systems
H. Liu 刘, Tai-Ping 太平 Sun 孙, Y. Wu 吴 +1 more·Jan 8, 2020
The solutions of the problems related to open quantum systems have attracted considerable interest. We propose a variational quantum algorithm to find the steady state of open quantum systems. In this algorithm, we employ parameterized quantum circui...
Vibronic States and Their Effect on the Temperature and Strain Dependence of Silicon-Vacancy Qubits in 4H - SiC
P. Udvarhelyi, G. Thiering, N. Morioka +9 more·Jan 8, 2020
Silicon-vacancy qubits in silicon carbide (SiC) are emerging tools in quantum technology applications due to their excellent optical and spin properties. In this paper, we explore the effect of temperature and strain on these properties by focusing o...
Machine learning enables completely automatic tuning of a quantum device faster than human experts
H. Moon, D. Lennon, J. Kirkpatrick +10 more·Jan 8, 2020
Variability is a problem for the scalability of semiconductor quantum devices. The parameter space is large, and the operating range is small. Our statistical tuning algorithm searches for specific electron transport features in gate-defined quantum ...
Reversible dynamics with closed time-like curves and freedom of choice
Germain Tobar, Fabio Costa·Jan 7, 2020
The theory of general relativity predicts the existence of closed time-like curves (CTCs), which theoretically would allow an observer to travel back in time and interact with their past self. This raises the question of whether this could create a g...
Effective routing design for remote entanglement generation on quantum networks
Changhao Li, Tianyi Li, Yi-Xiang Liu +1 more·Jan 7, 2020
Quantum network is a promising platform for many ground-breaking applications that lie beyond the capability of its classical counterparts. Efficient entanglement generation on quantum networks with relatively limited resources such as quantum memori...
Multiblock ADMM Heuristics for Mixed-Binary Optimization on Classical and Quantum Computers
Claudio Gambella, Andrea Simonetto·Jan 7, 2020
Solving combinatorial optimization problems on current noisy quantum devices is currently being advocated for (and restricted to) binary polynomial optimization with equality constraints via quantum heuristic approaches. This is achieved using, for e...
Model Predictive Control for Finite Input Systems using the D-Wave Quantum Annealer
D. Inoue, H. Yoshida·Jan 6, 2020
The D-Wave quantum annealer has emerged as a novel computational architecture that is attracting significant interest, but there have been only a few practical algorithms exploiting the power of quantum annealers. Here we present a model predictive c...
Direct estimation of quantum coherence by collective measurements
Yuan Yuan, Z. Hou, Jun-Feng Tang +4 more·Jan 6, 2020
The recently established resource theory of quantum coherence allows for a quantitative understanding of the superposition principle, with applications reaching from quantum computing to quantum biology. While different quantifiers of coherence have ...
Quantum Machine Learning Algorithm for Knowledge Graphs
Yunpu Ma, Yuyi Wang, Volker Tresp·Jan 4, 2020
Semantic knowledge graphs are large-scale triple-oriented databases for knowledge representation and reasoning. Implicit knowledge can be inferred by modeling the tensor representations generated from knowledge graphs. However, as the sizes of knowle...
Quantum computation of dominant products in lithium-sulfur batteries.
J. Rice, Tanvi P. Gujarati, M. Motta +4 more·Jan 4, 2020
Quantum chemistry simulations of some industrially relevant molecules are reported, employing variational quantum algorithms for near-term quantum devices. The energies and dipole moments are calculated along the dissociation curves for lithium hydri...
Discrete Adjoints for Accurate Numerical Optimization with Application to Quantum Control
N. Petersson, Fortino Garcia, A. Copeland +2 more·Jan 4, 2020
We consider optimizing control functions for realizing logical gates in a closed quantum systems, where the evolution of the state vector is governed by the time dependent Schrodinger equation. This is an optimal control problem where the objective f...
User-independent optical path length compensation scheme with sub-nanosecond timing resolution for a 1 × N quantum key distribution network system
B. Park, M. Woo, Yong-Su Kim +3 more·Jan 3, 2020
Quantum key distribution (QKD) networks constitute promising solutions for secure communication. Beyond conventional point-to-point QKD, we developed 1 × N QKD network systems with a sub-nanosecond resolution optical path length compensation scheme. ...
Noisy Simulation of Quantum Beats in Radical Pairs on a Quantum Computer
Brian Rost, B. Jones, M. Vyushkova +4 more·Jan 3, 2020
Current and near term quantum computers (i.e. NISQ devices) are limited in their computational power in part due to imperfect gate operations and imperfect qubits. This naturally constrains the computations run on these devices to be low-depth and sh...
Quantum circuits design for evaluating transcendental functions based on a function-value binary expansion method
Shengbin Wang, Zhimin Wang, Wendong Li +4 more·Jan 3, 2020
Quantum arithmetic in the computational basis constitutes the fundamental component of many circuit-based quantum algorithms. There exist a lot of studies about reversible implementations of algebraic functions, while research on the higher-level tra...
Optimal Entropy Compression and Purification in Quantum Bits
Varad R. Pande·Jan 2, 2020
Global unitary transformations (optswaps) that optimally increase the bias of any mixed computation qubit in a quantum system - represented by a diagonal density matrix - towards a particular state of the computational basis which, in effect, increas...
Cost-Function-Dependent Barren Plateaus in Shallow Quantum Neural Networks
M. Cerezo, A. Sone, Tyler Volkoff +2 more·Jan 2, 2020
Variational quantum algorithms (VQAs) optimize the parameters $\boldsymbol{\theta}$ of a quantum neural network $V(\boldsymbol{\theta})$ to minimize a cost function $C$. While VQAs may enable practical applications of noisy quantum computers, they ar...
Approximation of Quantum States Using Decision Diagrams
Alwin Zulehner, S. Hillmich, I. Markov +1 more·Jan 1, 2020
The computational power of quantum computers poses major challenges to new design tools since representing pure quantum states typically requires exponentially large memory. As shown previously, decision diagrams can reduce these memory requirements ...
Continuous measurements for control of superconducting quantum circuits
S. Hacohen-Gourgy, Leigh S. Martin·Jan 1, 2020
ABSTRACT Developments over the last two decades have opened the path towards quantum technologies in many quantum systems, such as cold atoms, trapped ions, cavity-quantum electrodynamics (QED), and circuit-QED. However, the fragility of quantum stat...