Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Autonomous Estimation of High-Dimensional Coulomb Diamonds from Sparse Measurements
A. Chatterjee, Fabio Ansaloni, Torbjørn Rasmussen +5 more·Aug 24, 2021
Quantum dot arrays possess ground states governed by Coulomb energies, utilized prominently by singly occupied quantum dots, each implementing a spin qubit. For such quantum processors, the controlled transitions between ground states are of operatio...
Simulations of hybrid charge-sensing single-electron-transistors and CMOS circuits
T. Tanamoto, K. Ono·Aug 24, 2021
Single-electron transistors (SETs) have been extensively used as charge sensors in many areas such as quantum computations. In general, the signals of SETs are smaller than those of complementary metal-oxide semiconductor (CMOS) devices, and many amp...
Efficient diagnostics for quantum error correction
Pavithran Iyer, Aditya Jain, S. Bartlett +1 more·Aug 24, 2021
Fault-tolerant quantum computing will require accurate estimates of the resource overhead, but standard metrics such as gate fidelity and diamond distance have been shown to be poor predictors of logical performance. We present a scalable experimental...
Approximate Petz Recovery from the Geometry of Density Operators
Samuel S. Cree, J. Sorce·Aug 24, 2021
We derive a new bound on the effectiveness of the Petz map as a universal recovery channel in approximate quantum error correction using the second sandwiched Rényi relative entropy D~2\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wa...
A large millikelvin platform at Fermilab for quantum computing applications
M. Hollister, R. Dhuley, G. Tatkowski·Aug 24, 2021
The need for larger mK cooling platforms is being driven by the desire to host ever growing numbers of cryogenic qubits in quantum computing platforms. As part of the Superconducting Quantum Materials and Systems Center at Fermilab funded through the...
Reducing unitary coupled cluster circuit depth by classical stochastic amplitude prescreening
Maria-Andreea Filip, Nathan Fitzpatrick, David Muñoz Ramo +1 more·Aug 24, 2021
Unitary Coupled Cluster (UCC) approaches are an appealing route to utilising quantum hardware to perform quantum chemistry calculations, as quantum computers can in principle perform UCC calculations in a polynomially scaling fashion, as compared to ...
Error mitigation for variational quantum algorithms through mid-circuit measurements
Ludmila A. S. Botelho, A. Glos, Akash Kundu +3 more·Aug 24, 2021
Noisy Intermediate-Scale Quantum (NISQ) algorithms require novel paradigms of error mitigation. To obtain noise-robust quantum computers, each logical qubit is equipped with hundreds or thousands of physical qubits. However, it is not possible to use...
EQUAL: Improving the Fidelity of Quantum Annealers by Injecting Controlled Perturbations
Ramin Ayanzadeh, Poulami Das, Swamit S. Tannu +1 more·Aug 24, 2021
Quantum computing is an information processing paradigm that uses quantum-mechanical properties to speedup computationally hard problems. Gate-based quantum computers and Quantum Annealers (QAs) are two commercially available hardware platforms that ...
A Fault-Tolerant Honeycomb Memory
C. Gidney, M. Newman, A. Fowler +1 more·Aug 24, 2021
Recently, Hastings & Haah introduced a quantum memory defined on the honeycomb lattice. Remarkably, this honeycomb code assembles weight-six parity checks using only two-local measurements. The sparse connectivity and two-local measurements are desir...
Configurable sublinear circuits for quantum state preparation
Israel F. Araujo, D. Park, Teresa B Ludermir +3 more·Aug 23, 2021
The theory of quantum algorithms promises unprecedented benefits of harnessing the laws of quantum mechanics for solving certain computational problems. A prerequisite for applying quantum algorithms to a wide range of real-world problems is loading ...
High-fidelity three-qubit iToffoli gate for fixed-frequency superconducting qubits
Yosep Kim, A. Morvan, Long B. Nguyen +6 more·Aug 23, 2021
The development of noisy intermediate-scale quantum devices has extended the scope of executable quantum circuits with high-fidelity single- and two-qubit gates. Equipping these devices with three-qubit gates will enable the realization of more compl...
Adaptive shot allocation for fast convergence in variational quantum algorithms
A. Gu, Angus Lowe, Pavel A. Dub +2 more·Aug 23, 2021
Variational Quantum Algorithms (VQAs) are a promising approach for practical applications like chemistry and materials science on near-term quantum computers as they typically reduce quantum resource requirements. However, in order to implement VQAs,...
Probabilistic computing with p-bits
J. Kaiser, S. Datta·Aug 22, 2021
Digital computers store information in the form of bits that can take on one of two values 0 and 1, while quantum computers are based on qubits that are described by a complex wavefunction, whose squared magnitude gives the probability of measuring e...
Entanglement Entropy in CFT and Modular Nuclearity
Lorenzo Panebianco, Benedikt Wegener·Aug 20, 2021
In the framework of Algebraic Quantum Field Theory, several operator algebraic notions of entanglement entropy can be associated with any pair of causally disjoint spacetime regions $\mathcal{S}_A$ and $\mathcal{S}_B$ with positive relative distance....
Bermudan option pricing by quantum amplitude estimation and Chebyshev interpolation
Koichi Miyamoto·Aug 20, 2021
Pricing of financial derivatives, in particular early exercisable options such as Bermudan options, is an important but heavy numerical task in financial institutions, and its speed-up will provide a large business impact. Recently, applications of q...
Scalable error mitigation for noisy quantum circuits produces competitive expectation values
Youngseok Kim, C. J. Wood, Theodore J. Yoder +4 more·Aug 20, 2021
A technique called error mitigation can significantly improve the performance of large-scale quantum computations on near-term devices without the significant resource overheard of fault-tolerant quantum error correction. Noise in existing quantum pr...
Estimation of Convex Polytopes for Automatic Discovery of Charge State Transitions in Quantum Dot Arrays
Oswin Krause, Torbjørn Rasmussen, Bertram Brovang +2 more·Aug 20, 2021
In spin based quantum dot arrays, material or fabrication imprecisions affect the behaviour of the device, which must be taken into account when controlling it. This requires measuring the shape of specific convex polytopes. We present an algorithm t...
A Step-by-Step HHL Algorithm Walkthrough to Enhance Understanding of Critical Quantum Computing Concepts
Anika Zaman, Hector Jose Morrell, H. Wong·Aug 20, 2021
After learning basic quantum computing concepts, it is desirable to reinforce the learning using an important and relatively complex algorithm through which students can observe and appreciate how qubits evolve and interact with each other. Harrow-Ha...
A Grover Search-Based Algorithm for the List Coloring Problem
S. Mukherjee·Aug 20, 2021
Graph coloring is a computationally difficult problem, and currently the best known classical algorithm for <inline-formula><tex-math notation="LaTeX">$k$</tex-math></inline-formula>-coloring of graphs on <inline-formula><tex-math notation="LaTeX">$n...
Quantum Optimization Heuristics with an Application to Knapsack Problems
W. V. Dam, Karim M. El Defrawy, Nicholas Genise +1 more·Aug 19, 2021
This paper introduces two techniques that make the standard Quantum Approximate Optimization Algorithm (QAOA) more suitable for constrained optimization problems. The first technique describes how to use the outcome of a prior greedy classical algori...