Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Quantum Fan-out: Circuit Optimizations and Technology Modeling
P. Gokhale, S. Koretsky, Shilin Huang +4 more·Jul 8, 2020
Instruction scheduling is a key compiler optimization in quantum computing, just as it is for classical computing. Current schedulers optimize for data parallelism by allowing simultaneous execution of instructions, as long as their qubits do not ove...
On Actual Preparation of Dicke State on a Quantum Computer
Chandra Sekhar Mukherjee, S. Maitra, V. Gaurav +1 more·Jul 3, 2020
The exact number of CNOT and single qubit gates needed to implement a Quantum Algorithm in a given architecture is one of the central problems of Quantum Computation. In this work we study the importance of concise realizations of Partially defined U...
Preparing symmetry broken ground states with variational quantum algorithms
N. Vogt, S. Zanker, Jan-Michael Reiner +3 more·Jul 3, 2020
One of the most promising applications for near term quantum computers is the simulation of physical quantum systems, particularly many-electron systems in chemistry and condensed matter physics. In solid state physics, finding the correct symmetry b...
Machine Learning of Noise-Resilient Quantum Circuits
L. Cincio, K. Rudinger, M. Sarovar +1 more·Jul 2, 2020
Noise mitigation and reduction will be crucial for obtaining useful answers from near-term quantum computers. In this work, we present a general framework based on machine learning for reducing the impact of quantum hardware noise on quantum circuits...
Multi-exponential error extrapolation and combining error mitigation techniques for NISQ applications
Z. Cai·Jul 2, 2020
Noise in quantum hardware remains the biggest roadblock for the implementation of quantum computers. To fight the noise in the practical application of near-term quantum computers, instead of relying on quantum error correction which requires large q...
Faster Digital Quantum Simulation by Symmetry Protection
Minh C. Tran, Yuan Su, D. Carney +1 more·Jun 29, 2020
Simulating the dynamics of quantum systems is an important application of quantum computers and has seen a variety of implementations on current hardware. We show that by introducing quantum gates implementing unitary transformations generated by the...
Amplitude estimation via maximum likelihood on noisy quantum computer
Tomoki Tanaka, Yohichi Suzuki, Shumpei Uno +3 more·Jun 29, 2020
Recently we find several candidates of quantum algorithms that may be implementable in near-term devices for estimating the amplitude of a given quantum state, which is a core subroutine in various computing tasks such as the Monte Carlo methods. One...
Quantum Approximate Optimization for Hard Problems in Linear Algebra
Ajinkya Borle, V. Elfving, S. Lomonaco·Jun 27, 2020
The quantum approximate optimization algorithm (QAOA) by Farhi et al. is a quantum computational framework for solving quantum or classical optimization tasks. Here, we explore using QAOA for binary linear least squares (BLLS); a problem that can ser...
Quantum Amplitude Estimation in the Presence of Noise
Eric G. Brown, O. Goktas, W. Tham·Jun 25, 2020
Quantum Amplitude Estimation (QAE) -- a technique by which the amplitude of a given quantum state can be estimated with quadratically fewer queries than by standard sampling -- is a key sub-routine in several important quantum algorithms, including G...
Deep learning enhanced individual nuclear-spin detection
Kyunghoon Jung, M. Abobeih, Jiwon Yun +5 more·Jun 24, 2020
The detection of nuclear spins using individual electron spins has enabled diverse opportunities in quantum sensing and quantum information processing. Proof-of-principle experiments have demonstrated atomic-scale imaging of nuclear-spin samples and ...
Mitigating measurement errors in multiqubit experiments
S. Bravyi, S. Sheldon, A. Kandala +2 more·Jun 24, 2020
Reducing measurement errors in multi-qubit quantum devices is critical for performing any quantum algorithm. Here we show how to mitigate measurement errors by a classical post-processing of the measured outcomes. Our techniques apply to any experime...
Bell inequality violation on small NISQ computers
H. Naus, H. Technology, Netherlands Institute for Space Research +2 more·Jun 24, 2020
Quantum computational experiments exploiting Noisy Intermediate-Scale Quantum (NISQ) devices to demonstrate violation of a Bell inequality are proposed. They consist of running specified quantum algorithms on few-qubit computers. If such a device ass...
Error-correction and noise-decoherence thresholds for coherent errors in planar-graph surface codes
F. Venn, B. B'eri·Jun 23, 2020
We numerically study coherent errors in surface codes on planar graphs, focusing on noise of the form of $Z$- or $X$-rotations of individual qubits. We find that, similarly to the case of incoherent bit- and phase-flips, a trade-off between resilienc...
Probing many-body localization on a noisy quantum computer
D. Zhu, S. Johri, N. Nguyen +5 more·Jun 22, 2020
A disordered system of interacting particles exhibits localized behavior when the disorder is large compared to the interaction strength. Studying this phenomenon on a quantum computer without error correction is challenging because even weak couplin...
Overhead of the non-local-to-local channel decomposition by quasiprobability sampling
K. Mitarai, K. Fujii·Jun 19, 2020
As the hardware technology for quantum computing advances, its possible applications are actively searched and developed. However, such applications still suffer from the noise on quantum devices, in particular when using two-qubit gates whose fideli...
Solving optimization problems with Rydberg analog quantum computers: Realistic requirements for quantum advantage using noisy simulation and classical benchmarks
Michel Fabrice Serret, B. Marchand, T. Ayral·Jun 19, 2020
Platforms of Rydberg atoms have been proposed as promising candidates to solve some combinatorial optimization problems. Here, we compute quantitative requirements on the system sizes and noise levels that these platforms must fulfill to reach quantu...
Shallow-circuit variational quantum eigensolver based on symmetry-inspired Hilbert space partitioning for quantum chemical calculations
Feng Zhang, N. Gomes, Noah F. Berthusen +4 more·Jun 19, 2020
Development of resource-friendly quantum algorithms remains highly desirable for noisy intermediate-scale quantum computing. Based on the variational quantum eigensolver (VQE) with unitary coupled cluster ansatz, we demonstrate that partitioning of t...
Process tomography of robust dynamical decoupling with superconducting qubits
A. M. Souza·Jun 18, 2020
Dynamical decoupling is a technique that protects qubits against noise. The ability to preserve quantum coherence in the presence of noise is essential for developing quantum devices. Here, the Rigetti quantum computing platform was used to test diff...
What are the prospects of using Grover's search in NISQ era?
Yulun Wang, P. Krstic·Jun 17, 2020
In order to understand the bounds of utilization of the Grover's search algorithm for the large unstructured data in presence of the quantum computer noise, we undertake a series of simulations by inflicting various types of noise, modelled by the IB...
Fast correlated-photon imaging enhanced by deep learning
Zhanming Li, Shi-Bao Wu, Jun Gao +5 more·Jun 16, 2020
Correlated photon pairs, carrying strong quantum correlations, have been harnessed to bring quantum advantages to various fields from biological imaging to range finding. Such inherent non-classical properties support extracting more valid signals to...