Papers
Live trends in quantum computing research, updated daily from arXiv.
Total Papers
31,714
This Month
152
Today
0
Research Volume
15,749 papers in 12 months (-37% vs prior quarter)
Research Focus Areas
Papers by research theme (12 months). Hover for details.
Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
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...
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...
Analog errors in quantum annealing: doom and hope
Adam Pearson, A. Mishra, I. Hen +1 more·Jul 29, 2019
Quantum annealing has the potential to provide a speedup over classical algorithms in solving optimization problems. Just as for any other quantum device, suppressing Hamiltonian control errors will be necessary before quantum annealers can achieve s...
Modular quantum computation in a trapped ion system
Kuan Zhang, Jayne Thompson, Xiang Zhang +7 more·Jul 29, 2019
Modern computation relies crucially on modular architectures, breaking a complex algorithm into self-contained subroutines. A client can then call upon a remote server to implement parts of the computation independently via an application programming...
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 ...
Quantum fast hitting on glued trees mapped on a photonic chip
Zi-Yu Shi, Hao Tang, Zhen Feng +7 more·Jul 29, 2019
Hitting the exit node from the entrance node faster on a graph is one of the properties that quantum walk algorithms can take advantage of to outperform classical random walk algorithms. Especially, continuous-time quantum walks on central-random glu...
Control and single-shot readout of an ion embedded in a nanophotonic cavity
J. Kindem, A. Ruskuc, J. Bartholomew +3 more·Jul 28, 2019
Distributing entanglement over long distances using optical networks is an intriguing macroscopic quantum phenomenon with applications in quantum systems for advanced computing and secure communication1,2. Building quantum networks requires scalable ...
Well-conditioned multiproduct Hamiltonian simulation
G. Low, V. Kliuchnikov, N. Wiebe·Jul 26, 2019
Product formula approximations of the time-evolution operator on quantum computers are of great interest due to their simplicity, and good scaling with system size by exploiting commutativity between Hamiltonian terms. However, product formulas exhib...
Exponential suppression of bit-flips in a qubit encoded in an oscillator
R. Lescanne, M. Villiers, T. Peronnin +6 more·Jul 26, 2019
A quantum system interacts with its environment—if ever so slightly—no matter how much care is put into isolating it1. Therefore, quantum bits undergo errors, putting dauntingly difficult constraints on the hardware suitable for quantum computation2....
Alibaba Cloud Quantum Development Kit: Large-Scale Classical Simulation of Quantum Circuits
Fang Zhang, Cupjin Huang, M. Newman +10 more·Jul 25, 2019
We report, in a sequence of notes, our work on the Alibaba Cloud Quantum Development Kit (AC-QDK). AC-QDK provides a set of tools for aiding the development of both quantum computing algorithms and quantum processors, and is powered by a large-scale ...
Quantum Advantage and the Y2K Bug: A Comparison
Lei Zhang, A. Miranskyy, Walid Rjaibi·Jul 24, 2019
The quantum advantage helps speed up computations in many areas. However, quantum computer power can also be leveraged to break modern cryptographic algorithms. To maintain the cryptoagility of software, we must prepare for the era of quantum advanta...
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...
Adaptive Quantum Simulated Annealing for Bayesian Inference and Estimating Partition Functions
A. Harrow, Annie Y. Wei·Jul 23, 2019
Markov chain Monte Carlo algorithms have important applications in counting problems and in machine learning problems, settings that involve estimating quantities that are difficult to compute exactly. How much can quantum computers speed up classica...
Uncomputability and complexity of quantum control
D. Bondar, A. Pechen·Jul 23, 2019
In laboratory and numerical experiments, physical quantities are known with a finite precision and described by rational numbers. Based on this, we deduce that quantum control problems both for open and closed systems are in general not algorithmical...
Continuous-variable quantum computing in the quantum optical frequency comb
O. Pfister·Jul 23, 2019
This topical review introduces the theoretical and experimental advances in continuous-variable (CV)—i.e. qumode-based in lieu of qubit-based—large-scale, fault-tolerant quantum computing and quantum simulation. An introduction to the physics and mat...
Phase estimation with randomized Hamiltonians
I. Kivlichan, C. Granade, N. Wiebe·Jul 23, 2019
Iterative phase estimation has long been used in quantum computing to estimate Hamiltonian eigenvalues. This is done by applying many repetitions of the same fundamental simulation circuit to an initial state, and using statistical inference to glean...
Foundational Patterns for Efficient Quantum Computing
Austin Gilliam, Charlene Venci, Sreraman Muralidharan +4 more·Jul 23, 2019
We present a number of quantum computing patterns that build on top of fundamental algorithms, that can be applied to solving concrete, NP-hard problems. In particular, we introduce the concept of a quantum dictionary as a summation of multiple patte...
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...
Quantum algorithm for the Vlasov equation
A. Engel, Graeme Smith, S. Parker·Jul 22, 2019
The Vlasov-Maxwell system of equations, which describes classical plasma physics, is extremely challenging to solve, even by numerical simulation on powerful computers. By linearizing and assuming a Maxwellian background distribution function, we con...
Unitary partitioning approach to the measurement problem in the Variational Quantum Eigensolver method.
A. Izmaylov, Tzu-Ching Yen, Robert A. Lang +1 more·Jul 21, 2019
To obtain estimates of electronic energies, the Variational Quantum Eigensolver (VQE) technique performs separate measurements for multiple parts of the system Hamiltonian. Current quantum hardware is restricted to projective single-qubit measurement...