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Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Robust quantum-network memory based on spin qubits in isotopically engineered diamond
C. Bradley, S. D. Bone, P. Møller +9 more·Nov 18, 2021
Quantum networks can enable quantum communication and modular quantum computation. A powerful approach is to use multi-qubit nodes that provide quantum memory and computational power. Nuclear spins associated with defects in diamond are promising qub...
Near-optimal Quantum algorithms for multivariate mean estimation
A. Cornelissen, Yassine Hamoudi, S. Jerbi·Nov 18, 2021
We propose the first near-optimal quantum algorithm for estimating in Euclidean norm the mean of a vector-valued random variable with finite mean and covariance. Our result aims at extending the theory of multivariate sub-Gaussian estimators [Lugosi ...
Exploring Airline Gate-Scheduling Optimization Using Quantum Computers
Hamed Mohammadbagherpoor, P. Dreher, Mohannad Ibrahim +4 more·Nov 18, 2021
This paper investigates the application of quantum computing technology to airline gate-scheduling quadratic assignment problems (QAP). We explore the quantum computing hardware architecture and software environment required for porting classical ver...
High-connectivity quantum processor nodes using single-ion qubits in rare-earth-ion-doped crystals
A. Kinos, L. Rippe, D. Serrano +2 more·Nov 17, 2021
We present two protocols for constructing quantum processor nodes in randomly doped rare-earthion crystals and analyze their properties. By varying the doping concentration and the accessible laser tunability, the processor nodes can contain anywhere...
Dynamical Anyon Generation in Kitaev Honeycomb Non-Abelian Spin Liquids.
Yue Liu, K. Slagle, K. Burch +1 more·Nov 17, 2021
Relativistic Mott insulators known as "Kitaev materials" potentially realize spin liquids hosting non-Abelian anyons. Motivated by fault-tolerant quantum-computing applications in this setting, we introduce a dynamical anyon-generation protocol that ...
Nearly Optimal Quantum Algorithm for Estimating Multiple Expectation Values.
W. Huggins, Kianna Wan, J. McClean +3 more·Nov 17, 2021
Many quantum algorithms involve the evaluation of expectation values. Optimal strategies for estimating a single expectation value are known, requiring a number of state preparations that scales with the target error ϵ as O(1/ϵ). In this Letter, we a...
A Four-Party Quantum Secret-Sharing Scheme based on Grover's Search Algorithm
Deepa Rathi, Farhan Musanna, Sanjeev Kumar·Nov 17, 2021
The work presents an amalgam of quantum search algorithm (QSA) and quantum secret sharing (QSS). The proposed QSS scheme utilizes Grover's three-particle quantum state. In this scheme, the dealer prepares an encoded state by encoding the classical in...
Quantum algorithm for matrix logarithm by integral formula
Yatian Wang, Hua Xiang, Songling Zhang·Nov 17, 2021
In scientific computing, one can find a wide application of the matrix-vector product f ( A ) b . Recently, a quantum algorithm that computes the state $$|f\rangle $$ | f ⟩ corresponding to f ( A ) b has been proposed in Takahira et al. (Quantum Inf ...
Spin Relaxation in Quasi-1D GaAs Mesowires: Control via Electric Field and Aspect Ratio
S. Castelletto, ChanJu You, Deborah L. Gater +1 more·Nov 17, 2021
We report on the measurements of spin relaxation in GaAs quasi-onedimensional mesowires, relying on spin noise spectroscopy, thus adding to the existing body of spin relaxation studies in bulk, two-dimensional and zero dimensional systems. In additio...
A Variation-Aware Quantum Circuit Mapping Approach Based on Multi-Agent Cooperation
P. Zhu, Weiping Ding, Lihuan Wei +3 more·Nov 17, 2021
Quantum circuit mapping is an essential process required by executing quantum circuits using a noisy intermediate-scale quantum (NISQ) device. Since qubits and quantum gates of a NISQ device are error-prone and variable in quality, it is crucial to c...
Introduction to quantum error correction and fault tolerance
S. Girvin·Nov 17, 2021
These lecture notes from the 2019 Les Houches Summer School on “Quantum Information Machines” are intended to provide an introduction to classical and quantum error correction with bits and qubits, and with continuous variable systems (harmonic oscil...
Robust quantum walk search without knowing the number of marked vertices
Yongzhen Xu, Delong Zhang, Lvzhou Li·Nov 17, 2021
There has been a very large body of research on searching a marked vertex on a graph based on quantum walks, and Grover’s algorithm can be regarded as a quantum walk-based search algorithm on a special graph. However, the existing quantum walk-based ...
Dequantizing the Quantum singular value transformation: hardness and applications to Quantum chemistry and the Quantum PCP conjecture
Sevag Gharibian, F. Gall·Nov 17, 2021
The Quantum Singular Value Transformation (QSVT) is a recent technique that gives a unified framework to describe most quantum algorithms discovered so far, and may lead to the development of novel quantum algorithms. In this paper we investigate the...
Toward a quantum computing algorithm to quantify classical and quantum correlation of system states
M. Mahdian, H. Yeganeh·Nov 17, 2021
Optimal measurement is required to obtain the quantum and classical correlations of a quantum state, and the crucial difficulty is how to acquire the maximal information about one system by measuring the other part; in other words, getting the maximu...
Unsupervised Learning of Symmetry Protected Topological Phase Transitions
En-Jui Kuo, Hossein Dehghani·Nov 16, 2021
Symmetry-protected topological (SPT) phases are short-range entangled phases of matter with a non-local order parameter which are preserved under a local symmetry group. Here, by using unsupervised learning algorithm, namely the diffusion maps, we de...
Variational Adiabatic Gauge Transformation on Real Quantum Hardware for Effective Low-Energy Hamiltonians and Accurate Diagonalization
Laura Gentini, A. Cuccoli, L. Banchi·Nov 16, 2021
Effective low-energy theories represent powerful theoretical tools to reduce the complexity in modeling interacting quantum many-particle systems. However, common theoretical methods rely on perturbation theory, which limits their applicability to we...
Quantum Heaviside Eigen Solver
Zheng-Zhi Sun, G. Su·Nov 16, 2021
Solving Hamiltonian matrix is a central task in quantum many-body physics and quantum chemistry. Here we propose a novel quantum algorithm named as a quantum Heaviside eigen solver to calculate both the eigen values and eigen states of the general Ha...
Using classical bit-flip correction for error mitigation in quantum computations including 2-qubit correlations
C. Alexandrou, L. Funcke, T. Hartung +5 more·Nov 16, 2021
We present an error mitigation scheme which corrects readout errors on Noisy Intermediate-Scale Quantum (NISQ) computers [1, 2]. After a short review of applying the method to one qubit, we proceed to discuss the case when correlations between differe...
Heat rectification through single and coupled quantum dots
Ludovico Tesser, Burhanuddin Bhandari, P. A. Erdman +3 more·Nov 16, 2021
We study heat rectification through quantum dots in the Coulomb blockade regime using a master equation approach. We consider both cases of two-terminal and four-terminal devices. In the two-terminal configuration, we analyze the case of a single qua...
Dissipative entanglement generation between two driven qubits in circuit quantum electrodynamics
Sebasti'an Luciano Gallardo, D. Domínguez, M. J. S'anchez·Nov 16, 2021
An entangled state generation protocol for a system of two qubits driven with an ac signal and coupled through a resonator is introduced. We explain the mechanism of entanglement generation in terms of an interplay between unitary Landau-Zener-Stücke...