Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Regimes of Classical Simulability for Noisy Gaussian Boson Sampling.
H. Qi, D. Brod, N. Quesada +1 more·May 29, 2019
As a promising candidate for exhibiting quantum computational supremacy, Gaussian boson sampling (GBS) is designed to exploit the ease of experimental preparation of Gaussian states. However, sufficiently large and inevitable experimental noise might...
Distinguishing noisy boson sampling from classical simulations
V. Shchesnovich·May 27, 2019
Giving a convincing experimental evidence of the quantum supremacy over classical simulations is a challenging goal. Noise is considered to be the main problem in such a demonstration, hence it is urgent to understand the effect of noise. Recently fo...
Full-Stack, Real-System Quantum Computer Studies: Architectural Comparisons and Design Insights
Prakash Murali, N. Linke, M. Martonosi +3 more·May 27, 2019
In recent years, Quantum Computing (QC) has progressed to the point where small working prototypes are available for use. Termed Noisy Intermediate-Scale Quantum (NISQ) computers, these prototypes are too small for large benchmarks or even for Quantu...
Empirical determination of the simulation capacity of a near-term quantum computer
Rich Rines, K. Obenland, I. Chuang·May 26, 2019
Experimentally realizable quantum computers are rapidly approaching the threshold of quantum supremacy. Quantum Hamiltonian simulation promises to be one of the first practical applications for which such a device could demonstrate an advantage over ...
Asymptotic Improvements to Quantum Circuits via Qutrits
P. Gokhale, Jonathan M. Baker, Casey Duckering +3 more·May 24, 2019
Quantum computation is traditionally expressed in terms of quantum bits, or qubits. In this work, we instead consider three-level qutrits. Past work with qutrits has demonstrated only constant factor improvements, owing to the $\log_{2}$ (3) binary-t...
How to factor 2048 bit RSA integers in 8 hours using 20 million noisy qubits
C. Gidney, Martin Ekerå·May 23, 2019
We significantly reduce the cost of factoring integers and computing discrete logarithms in finite fields on a quantum computer by combining techniques from Shor 1994, Griffiths-Niu 1996, Zalka 2006, Fowler 2012, Ekerå-Håstad 2017, Ekerå 2017, Ekerå ...
Improving security and bandwidth efficiency of NewHope using error-correction schemes
Minki Song, Seunghwan Lee, Eunsang Lee +3 more·May 20, 2019
Among many submissions to the NIST post-quantum cryptography (PQC) project, NewHope is a promising key encapsulation mechanism (KEM) based on the Ring-Learning with errors (Ring-LWE) problem. Since the most important factors to be considered for PQC ...
Protocol for a resonantly driven three-qubit Toffoli gate with silicon spin qubits
M. Gullans, J. Petta·May 16, 2019
The three-qubit Toffoli gate plays an important role in quantum error correction and complex quantum algorithms such as Shor's factoring algorithm, motivating the search for efficient implementations of this gate. Here we introduce a Toffoli gate sui...
Benchmarking quantum processors with a single qubit
Oktay Göktaş, W. Tham, Kent Bonsma-Fisher +1 more·May 14, 2019
The first generation of small noisy quantum processors have recently become available to non-specialists who are not required to understand specifics of the physical platforms and, in particular, the types and sources of noise. As such, it is useful ...
Relations among k-ME concurrence, negativity, polynomial invariants, and tangle
Limei Zhang, Ting Gao, Fengli Yan·May 13, 2019
The k-ME concurrence as a measure of multipartite entanglement (ME) unambiguously detects all k-nonseparable states in arbitrary dimensions and satisfies many important properties of an entanglement measure. Negativity is a simple computable bipartit...
Adding artificial noise for code rate matching in continuous-variable quantum key distribution
S. Kreinberg, I. Koltchanov, A. Richter·May 13, 2019
The reconciliation step of continuous-variable quantum key distribution protocols usually involves forward error correction codes. Matching the code rate and the signal-to-noise ratio (SNR) of the quantum channel is required to achieve the high recon...
Neural ensemble decoding for topological quantum error-correcting codes
Milap Sheth, S. Jafarzadeh, Vlad Gheorghiu·May 7, 2019
Topological quantum error-correcting codes are a promising candidate for building fault-tolerant quantum computers. Decoding topological codes optimally, however, is known to be a computationally hard problem. Various decoders have been proposed that...
Entanglement and complexity of interacting qubits subject to asymmetric noise
E. Kapit, P. Roushan, C. Neill +2 more·May 6, 2019
The simulation complexity of predicting the time evolution of delocalized many-body quantum systems has attracted much recent interest, and simulations of such systems in real quantum hardware are promising routes to demonstrating a quantum advantage...
Quantum Hamiltonian Identification With Classical Colored Measurement Noise
Lingyu Tan, Daoyi Dong, Dewei Li +1 more·May 5, 2019
In this brief, we present a Hamiltonian-identification method for a closed quantum system whose time-trace observables are measured with colored measurement noise. The dynamics of the quantum system are described by a Liouville equation that can be c...
Quantum chemistry as a benchmark for near-term quantum computers
A. McCaskey, Zachary P. Parks, J. Jakowski +4 more·May 4, 2019
We present a quantum chemistry benchmark for noisy intermediate-scale quantum computers that leverages the variational quantum eigensolver, active-space reduction, a reduced unitary coupled cluster ansatz, and reduced density purification as error mi...
Bias-preserving gates with stabilized cat qubits
S. Puri, L. St-Jean, J. Gross +11 more·May 1, 2019
Noise asymmetry in the quantum operations with cat-qubits is exploited for efficient fault-tolerant quantum error correction. The code capacity threshold for error correction using biased-noise qubits is known to be higher than with qubits without su...
Entanglement, and unsorted database search in noise-based logic
L. Kish, W. Daugherity·Apr 30, 2019
We explore the collapse of “wavefunction” and the measurement of entanglement in the superpositions of hyperspace vectors in classical physical instantaneous-noise-based logic (INBL). We find both similarities with and major differences from the rela...
Leakage mitigation for quantum error correction using a mixed qubit scheme
N. C. Brown, K. Brown·Apr 24, 2019
Leakage errors take qubits out of the computational subspace and will accumulate if not addressed. A leaked qubit will reduce the effectiveness of quantum error correction protocols due to the cost of implementing leakage reduction circuits and the h...
Quantum-assisted associative adversarial network: applying quantum annealing in deep learning
M. Wilson, Thomas Vandal, T. Hogg +1 more·Apr 23, 2019
Generative models have the capacity to model and generate new examples from a dataset and have an increasingly diverse set of applications driven by commercial and academic interest. In this work, we present an algorithm for learning a latent variabl...
A Silicon Surface Code Architecture Resilient Against Leakage Errors
Z. Cai, M. Fogarty, S. Schaal +3 more·Apr 23, 2019
Spin qubits in silicon quantum dots are one of the most promising building blocks for large scale quantum computers thanks to their high qubit density and compatibility with the existing semiconductor technologies. High fidelity single-qubit gates ex...