Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Single-preparation unsupervised quantum machine learning: concepts and applications
Y. Deville, A. Deville·Jan 5, 2021
The term"machine learning"especially refers to algorithms that derive mappings, i.e. intput/output transforms, by using numerical data that provide information about considered transforms. These transforms appear in many problems, related to classifi...
Radio frequency mixing modules for superconducting qubit room temperature control systems.
Yilun Xu, Gang-Ming Huang, D. Santiago +1 more·Dec 31, 2020
As the number of qubits in nascent quantum processing units increases, the connectorized RF (radio frequency) analog circuits used in first generation experiments become exceedingly complex. The physical size, cost, and electrical failure rate all be...
Quantum Circuit Evolution on NISQ Devices
L. Franken, B. Georgiev, Sascha Mucke +4 more·Dec 23, 2020
Variational quantum circuits build the foundation for various classes of quantum algorithms. In a nutshell, the weights of a parametrized quantum circuit are varied until the empirical sampling distribution of the circuit is sufficiently close to a d...
Crosstalk Suppression for Fault-tolerant Quantum Error Correction with Trapped Ions
Pedro Parrado-Rodríguez, C. Ryan-Anderson, A. Bermudez +1 more·Dec 21, 2020
Physical qubits in experimental quantum information processors are inevitably exposed to different sources of noise and imperfections, which lead to errors that typically accumulate hindering our ability to perform long computations reliably. Progres...
Improved Strong Simulation of Universal Quantum Circuits
L. Kocia·Dec 21, 2020
We find a scaling reduction in the stabilizer rank of the twelve-qubit tensored $T$ gate magic state. This lowers its asymptotic bound to $2^{\sim 0.463 t}$ for multi-Pauli measurements on $t$ magic states, improving over the best previously found bo...
QGo: Scalable Quantum Circuit Optimization Using Automated Synthesis
Xin-Chuan Wu, M. Davis, F. Chong +1 more·Dec 17, 2020
—The current phase of quantum computing is in the Noisy Intermediate-Scale Quantum (NISQ) era. On NISQ devices, two-qubit gates such as CNOTs are much noisier than single-qubit gates, so it is essential to minimize their count. Quantum circuit synthe...
Early fault-tolerant simulations of the Hubbard model
E. Campbell·Dec 16, 2020
Simulation of the Hubbard model is a leading candidate for the first useful applications of a fault-tolerant quantum computer. A recent study of quantum algorithms for early simulations of the Hubbard model [Kivlichan et al 2019 Quantum 4 296] found ...
Constructing quantum circuits with global gates
J. J. Van De Wetering·Dec 16, 2020
There are various gate sets that can be used to describe a quantum computation. A particularly popular gate set in the literature on quantum computing consists of arbitrary single-qubit gates and two-qubit CNOT gates. A CNOT gate is however not alway...
Dynamically Corrected Nonadiabatic Holonomic Quantum Gates
Sai Li, Z. Xue·Dec 16, 2020
The key for realizing fault-tolerant quantum computation lies in maintaining the coherence of all the qubits so that high-fidelity and robust qubit manipulations can be achievable. One of the promising approaches is to use geometric phases in the con...
High-fidelity superconducting quantum processors via laser-annealing of transmon qubits
E. Zhang, S. Srinivasan, N. Sundaresan +19 more·Dec 15, 2020
Scaling the number of qubits while maintaining high-fidelity quantum gates remains a key challenge for quantum computing. Presently, superconducting quantum processors with >50-qubits are actively available. For such systems, fixed-frequency transmon...
Relaxed Peephole Optimization: A Novel Compiler Optimization for Quantum Circuits
Ji Liu, Luciano Bello, Huiyang Zhou·Dec 14, 2020
As in classical computing, compilers play an important role in quantum computing. Quantum processors typically support a limited set of primitive operations or quantum gates and have certain hardware-related limitations. A quantum compiler is respons...
Quantum Key Recovery Attack on SIMON Block Cipher
Hui Liu, Li Yang·Dec 12, 2020
The quantum security of lightweight block ciphers is receiving more and more attention. However, the existing quantum attacks on lightweight block ciphers mainly focused on the quantum exhaustive search, while the quantum dedicated attacks combined w...
Majorana braiding gates for topological superconductors in a one dimensional geometry
Marek Narozniak, M. Dartiailh, J. Dowling +2 more·Dec 11, 2020
We propose and analyze a physical system capable of performing topological quantum computation with Majorana zero modes (MZM) in a one-dimensional topological superconductor (1DTS). One of the leading methods to realize quantum gates in 1DTS is to us...
Counterfactual Concealed Telecomputation
Fakhar Zaman, Hyundong Shin, M. Win·Dec 9, 2020
Distributed computing is a fastest growing field -- enabling virtual computing, parallel computing, and distributed storage. By exploiting the counterfactual techniques, we devise a distributed blind quantum computation protocol to perform a universa...
Quantum Error Correction Thresholds for the Universal Fibonacci Turaev-Viro Code
Alexis Schotte, Guanyu Zhu, Lander Burgelman +1 more·Dec 8, 2020
We consider a two-dimensional quantum memory of qubits on a torus which encode the extended Fibonacci string-net code, and devise strategies for error correction when those qubits are subjected to depolarizing noise. Building on the concept of tube a...
Expectation values from the single-layer quantum approximate optimization algorithm on Ising problems
A. Ozaeta, Wim van Dam, P. McMahon·Dec 7, 2020
We report on the energy-expectation-value landscapes produced by the single-layer (p = 1) quantum approximate optimization algorithm (QAOA) when being used to solve Ising problems. The landscapes are obtained using an analytical formula that we deriv...
Building a Fault-Tolerant Quantum Computer Using Concatenated Cat Codes
C. Chamberland, Kyungjoo Noh, Patricio Arrangoiz-Arriola +13 more·Dec 7, 2020
We present a comprehensive architectural analysis for a fault-tolerant quantum computer based on cat codes concatenated with outer quantum error-correcting codes. For the physical hardware, we propose a system of acoustic resonators coupled to superc...
Automatic virtual voltage extraction of a 2x2 array of quantum dots with machine learning
G. Oakes, J. Duan, J. Morton +3 more·Dec 7, 2020
Spin qubits in quantum dots are a compelling platform for fault-tolerant quantum computing due to the potential to fabricate dense two-dimensional arrays with nearest neighbour couplings, a requirement to implement the surface code. However, due to t...
Tensor Network Quantum Simulator With Step-Dependent Parallelization
Danylo Lykov, R. Schutski, A. Galda +2 more·Dec 4, 2020
In this work, we present a new large-scale quantum circuit simulator. It is based on the tensor network contraction technique to represent quantum circuits. We propose a novel parallelization algorithm based on step-dependent slicing . In this paper,...
Simulating Hydrodynamics on Noisy Intermediate-Scale Quantum Devices with Random Circuits.
Jonas Richter, A. Pal·Dec 4, 2020
In a recent milestone experiment, Google's processor Sycamore heralded the era of "quantum supremacy" by sampling from the output of (pseudo-)random circuits. We show that such random circuits provide tailor-made building blocks for simulating quantu...