Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Optimal Quantum Control with Poor Statistics
F. Sauvage, F. Mintert·Sep 3, 2019
Learning how to control a quantum system based on experimental data can help us to exceed the limitations imposed by theoretical modelling. Due to the intrinsic probabilistic nature of quantum mechanics, it is fundamentally necessary to repeat measur...
Classifying single-qubit noise using machine learning
Travis L. Scholten, Yi-Kai Liu, Kevin C. Young +1 more·Aug 30, 2019
Quantum characterization, validation, and verification (QCVV) techniques are used to probe, characterize, diagnose, and detect errors in quantum information processors (QIPs). An important component of any QCVV protocol is a mapping from experimental...
Quantum-classical hybrid algorithm using an error-mitigating N -representability condition to compute the Mott metal-insulator transition
Scott E. Smart, D. Mazziotti·Aug 28, 2019
Quantum algorithms for molecular electronic structure have been developed with lower computational scaling than their classical counterparts, but emerging quantum hardware is far from being capable of the coherence,connectivity and gate errors requir...
Quantum Circuit Transformation Based on Simulated Annealing and Heuristic Search
Xiang-Yu Zhou, Sanjiang Li, Yuan Feng·Aug 23, 2019
Quantum algorithm design usually assumes access to a perfect quantum computer with ideal properties like full connectivity, noise-freedom, and arbitrarily long coherence time. In noisy intermediate-scale quantum (NISQ) devices, however, the number of...
Variational Spin-Squeezing Algorithms on Programmable Quantum Sensors.
Raphael Kaubruegger, P. Silvi, C. Kokail +5 more·Aug 22, 2019
Arrays of atoms trapped in optical tweezers combine features of programmable analog quantum simulators with atomic quantum sensors. Here we propose variational quantum algorithms, tailored for tweezer arrays as programmable quantum sensors, capable o...
Optimal control for the quantum simulation of nuclear dynamics
E. Holland, K. Wendt, K. Kravvaris +6 more·Aug 22, 2019
We propose a method for enacting the unitary time propagation of two interacting neutrons at leading order of chiral effective-field theory by efficiently encoding the nuclear dynamics into a single multilevel quantum device. The emulated output of t...
Quantum solvability of noisy linear problems by divide-and-conquer strategy
Wooyeong Song, Youngrong Lim, Kabgyun Jeong +5 more·Aug 17, 2019
Noisy linear problems have been studied in various science and engineering disciplines. A class of ‘hard’ noisy linear problems can be formulated as follows: Given a matrix A^ and a vector b constructed using a finite set of samples, a hidden vector ...
Noise resilience of variational quantum compiling
Kunal Sharma, Sumeet Khatri, M. Cerezo +1 more·Aug 12, 2019
Variational hybrid quantum-classical algorithms (VHQCAs) are near-term algorithms that leverage classical optimization to minimize a cost function, which is efficiently evaluated on a quantum computer. Recently VHQCAs have been proposed for quantum c...
Fault-tolerant bosonic quantum error correction with the surface–Gottesman-Kitaev-Preskill code
Kyungjoo Noh, C. Chamberland·Aug 9, 2019
The performance of the circuit-based surface-GKP bosonic quantum error correction code under noise due to finite squeezing of the GKP states and photon losses is investigated. The authors show under what conditions fault-tolerant quantum error correc...
Optimizing quantum heuristics with meta-learning
M. Wilson, Rachel Stromswold, F. Wudarski +3 more·Aug 8, 2019
Variational quantum algorithms, a class of quantum heuristics, are promising candidates for the demonstration of useful quantum computation. Finding the best way to amplify the performance of these methods on hardware is an important task. Here, we e...
Resource-efficient quantum algorithm for protein folding
A. Robert, P. Barkoutsos, Stefan Woerner +1 more·Aug 6, 2019
Predicting the three-dimensional structure of a protein from its primary sequence of amino acids is known as the protein folding problem. Due to the central role of proteins’ structures in chemistry, biology and medicine applications, this subject ha...
Machine-learning based three-qubit gate for realization of a Toffoli gate with cQED-based transmon systems
Sahar Daraeizadeh, S. Premaratne, Xiaoyu Song +2 more·Aug 2, 2019
We use machine learning techniques to design a 50 ns three-qubit flux-tunable controlled-controlled-phase gate with fidelity of>99.99% for nearest-neighbor coupled transmons in circuit quantum electrodynamics architectures. We explain our gate design...
Efficient Estimation of Pauli Channels
S. Flammia, Joel J. Wallman·Jul 30, 2019
Pauli channels are ubiquitous in quantum information, both as a dominant noise source in many computing architectures and as a practical model for analyzing error correction and fault tolerance. Here, we prove several results on efficiently learning ...
Efficient and noise resilient measurements for quantum chemistry on near-term quantum computers
W. Huggins, J. McClean, N. Rubin +4 more·Jul 30, 2019
Variational algorithms are a promising paradigm for utilizing near-term quantum devices for modeling electronic states of molecular systems. However, previous bounds on the measurement time required have suggested that the application of these techni...
Scalable characterization of localizable entanglement in noisy topological quantum codes
D. Amaro, M. Muller, A. Pal·Jul 30, 2019
Topological quantum error correcting codes have emerged as leading candidates towards the goal of achieving large-scale fault-tolerant quantum computers. However, quantifying entanglement in these systems of large size in the presence of noise is a c...
Entanglement of genuinely entangled subspaces and states: Exact, approximate, and numerical results
M. Demianowicz, R. Augusiak·Jul 29, 2019
Genuinely entangled subspaces (GESs) are those subspaces of multipartite Hilbert spaces that consist only of genuinely multiparty entangled pure states. They are natural generalizations of the well-known notion of completely entangled subspaces , whi...
Quantum error correction of a qubit encoded in grid states of an oscillator
P. Campagne-Ibarcq, A. Eickbusch, S. Touzard +10 more·Jul 29, 2019
The accuracy of logical operations on quantum bits (qubits) must be improved for quantum computers to outperform classical ones in useful tasks. One method to achieve this is quantum error correction (QEC), which prevents noise in the underlying syst...
Error-corrected gates on an encoded qubit
P. Reinhold, Serge Rosenblum, Wen-Long Ma +3 more·Jul 29, 2019
To reach their full potential, quantum computers need to be resilient to noise and decoherence. In such a fault-tolerant quantum computer, errors must be corrected in real time to prevent them from propagating between components1,2. This requirement ...
Demonstrating Quantum Coherence and Metrology that is Resilient to Transversal Noise.
Chao Zhang, T. Bromley, Yun-Feng Huang +7 more·Jul 24, 2019
Quantum systems can be exploited for disruptive technologies but in practice quantum features are fragile due to noisy environments. Quantum coherence, a fundamental such feature, is a basis-dependent property that is known to exhibit a resilience to...
Fast Gate-Based Readout of Silicon Quantum Dots Using Josephson Parametric Amplification.
S. Schaal, Imtiaz Ahmed, J. Haigh +13 more·Jul 22, 2019
Spins in silicon quantum devices are promising candidates for large-scale quantum computing. Gate-based sensing of spin qubits offers a compact and scalable readout with high fidelity, however, further improvements in sensitivity are required to meet...