Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
The relationship between costs for quantum error mitigation and non-Markovian measures
H. Hakoshima, Y. Matsuzaki, Suguru Endo·Sep 27, 2020
Quantum error mitigation (QEM) has been proposed as an alternative method of quantum error correction (QEC) to compensate errors in quantum systems without qubit overhead. While Markovian gate errors on digital quantum computers are mainly considered...
Squeezed comb states
N. Shukla, S. Nimmrichter, B. Sanders·Sep 27, 2020
Continuous-variable codes are an expedient solution for quantum information processing and quantum communication involving optical networks. Here we characterize the squeezed comb, a finite superposition of equidistant squeezed coherent states on a l...
The modified logarithmic Sobolev inequality for quantum spin systems: classical and commuting nearest neighbour interactions
'Angela Capel, Cambyse Rouz'e, Daniel Stilck Francca·Sep 24, 2020
Given a uniform, frustration-free family of local Lindbladians defined on a quantum lattice spin system in any spatial dimension, we prove a strong exponential convergence in relative entropy of the system to equilibrium under a condition of spatial ...
Single-Shot Error Correction of Three-Dimensional Homological Product Codes
A. O. Quintavalle, M. Vasmer, Joschka Roffe +1 more·Sep 24, 2020
Single-shot error correction corrects data noise using only a single round of noisy measurements on the data qubits, removing the need for intensive measurement repetition. We introduce a general concept of confinement for quantum codes, which roughl...
Optimal provable robustness of quantum classification via quantum hypothesis testing
Maurice Weber, Nana Liu, Bo Li +2 more·Sep 21, 2020
Quantum machine learning models have the potential to offer speedups and better predictive accuracy compared to their classical counterparts. However, these quantum algorithms, like their classical counterparts, have been shown to also be vulnerable ...
Variational simulation of Schwinger's Hamiltonian with polarization qubits
O. V. Borzenkova, G. Struchalin, A. Kardashin +5 more·Sep 21, 2020
The numerical emulation of quantum physics and quantum chemistry often involves an intractable number of degrees of freedom and admit no known approximations in a general form. In practice, representing quantum-mechanical states using available numer...
The XZZX surface code
J. P. Bonilla-Ataides, David K. Tuckett, S. Bartlett +3 more·Sep 16, 2020
Performing large calculations with a quantum computer will likely require a fault-tolerant architecture based on quantum error-correcting codes. The challenge is to design practical quantum error-correcting codes that perform well against realistic n...
Benchmarking quantum state transfer on quantum devices
Yi-Te Huang, Jhen-Dong Lin, Huan-Yu Ku +1 more·Sep 16, 2020
Quantum state transfer (QST) provides a method to send arbitrary quantum states from one system to another. Such a concept is crucial for transmitting quantum information into the quantum memory, quantum processor, and quantum network. The standard c...
Extended flag gadgets for low-overhead circuit verification
D. Debroy, K. Brown·Sep 16, 2020
Flag verification techniques are useful in quantum error correction for detecting critical faults. Here we present an application of flag-verification techniques for improving postselected performance of near-term algorithms. We extend the definition...
From Pulses to Circuits and Back Again: A Quantum Optimal Control Perspective on Variational Quantum Algorithms
Alicia B. Magann, C. Arenz, Matthew D. Grace +5 more·Sep 14, 2020
The last decade has witnessed remarkable progress in the development of quantum technologies. Although fault-tolerant devices likely remain years away, the noisy intermediate-scale quantum devices of today may be leveraged for other purposes. Leading...
Limitations of optimization algorithms on noisy quantum devices
Daniel Stilck França, R. García-Patrón·Sep 11, 2020
Recent successes in producing intermediate-scale quantum devices have focused interest on establishing whether near-term devices could outperform classical computers for practical applications. A central question is whether noise can be overcome in t...
Studying many-body localization in exchange-coupled electron spin qubits using spin-spin correlations
R. Throckmorton, S. Das Sarma·Sep 9, 2020
We show that many-body localization (MBL) effects can be observed in a finite chain of exchange-coupled spin qubits in the presence of both exchange and magnetic noise, a system that has been experimentally realized in semiconductors and is a potenti...
Simulation of wave-particle duality in multipath interferometers on a quantum computer
Mirko Amico, Christoph Dittel·Sep 8, 2020
We present an architecture to investigate wave-particle duality in $N$-path interferometers on a universal quantum computer involving as low as $2{log}_{2}N$ qubits and develop a measurement scheme that allows the efficient extraction of quantifiers ...
Control and readout of a superconducting qubit using a photonic link
F. Lecocq, F. Quinlan, K. Cicak +3 more·Sep 2, 2020
Delivering on the revolutionary promise of a universal quantum computer will require processors with millions of quantum bits (qubits)1–3. In superconducting quantum processors4, each qubit is individually addressed with microwave signal lines that c...
Maximal Entropy Approach for Quantum State Tomography
Rishabh Gupta, Rongxin Xia, R. Levine +1 more·Sep 2, 2020
Quantum computation has been growing rapidly in both theory and experiments. In particular, quantum computing devices with a large number of qubits have been developed by IBM, Google, IonQ, and others. The current quantum computing devices are noisy ...
Efficient Classical Simulation and Benchmarking of Quantum Processes in the Weyl Basis.
Daniel Stilck França, Sergii Strelchuk, Michał Studziński·Aug 27, 2020
One of the crucial steps in building a scalable quantum computer is to identify the noise sources which lead to errors in the process of quantum evolution. Different implementations come with multiple hardware-dependent sources of noise and decoheren...
Real-time simulation of (2+1)-dimensional lattice gauge theory on qubits
A. Yamamoto·Aug 26, 2020
We study the quantum simulation of $Z_2$ lattice gauge theory in 2+1 dimensions. The dual variable formulation, the so-called Wegner duality, is utilized for reducing redundant gauge degrees of freedom. The problem of artificial charge unconservati...
Algorithmic Error Mitigation Scheme for Current Quantum Processors
Philippe Suchsland, F. Tacchino, M. H. Fischer +3 more·Aug 25, 2020
We present a hardware agnostic error mitigation algorithm for near term quantum processors inspired by the classical Lanczos method. This technique can reduce the impact of different sources of noise at the sole cost of an increase in the number of m...
Fibonacci Anyons Versus Majorana Fermions: A Monte Carlo Approach to the Compilation of Braid Circuits in SU(2)k Anyon Models
Emil Génetay Johansen, T. Simula·Aug 25, 2020
We have studied ${\rm SU}(2)_k$ anyon models, assessing their prospects for topological quantum computation. In particular, we have compared the Ising ($k=2$) anyon and Fibonacci ($k=3$) anyon models, motivated by their potential for future realizati...
Microcanonical and finite-temperature ab initio molecular dynamics simulations on quantum computers
I. O. Sokolov, P. Barkoutsos, Lukas Moeller +3 more·Aug 18, 2020
Ab initio molecular dynamics (AIMD) is a powerful tool to predict properties of molecular and condensed matter systems. The quality of this procedure is based on accurate electronic structure calculations. The development of quantum processors has sh...