Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Practical quantum computation of chemical and nuclear energy levels using quantum imaginary time evolution and Lanczos algorithms
Kubra Yeter-Aydeniz, R. Pooser, G. Siopsis·Dec 12, 2019
Various methods have been developed for the quantum computation of the ground and excited states of physical and chemical systems, but many of them require either large numbers of ancilla qubits or high-dimensional optimization in the presence of noi...
Strategies for solving the Fermi-Hubbard model on near-term quantum computers
Chris Cade, Lana Mineh, A. Montanaro +1 more·Dec 12, 2019
The Fermi-Hubbard model is of fundamental importance in condensed-matter physics, yet is extremely challenging to solve numerically. Finding the ground state of the Hubbard model using variational methods has been predicted to be one of the first app...
Learning Non-Markovian Quantum Noise from Moiré-Enhanced Swap Spectroscopy with Deep Evolutionary Algorithm
M. Niu, Vadim N. Smelyanskyi, P. Klimov +30 more·Dec 9, 2019
Two-level-system (TLS) defects in amorphous dielectrics are a major source of noise and decoherence in solid-state qubits. Gate-dependent non-Markovian errors caused by TLS-qubit coupling are detrimental to fault-tolerant quantum computation and have...
Coherence in logical quantum channels
Joseph K. Iverson, J. Preskill·Dec 9, 2019
We study the effectiveness of quantum error correction against coherent noise. Coherent errors (for example, unitary noise) can interfere constructively, so that in some cases the average infidelity of a quantum circuit subjected to coherent errors m...
Local quantum uncertainty for multipartite quantum systems
Mazhar N. Ali·Dec 9, 2019
Local quantum uncertainty captures purely quantum correlations excluding their classical counterpart. This measure is quantum discord type, however with the advantage that there is no need to carry out the complicated optimization procedure over meas...
Initial states for quantum field simulations in phase space
P. Drummond, B. Opanchuk·Dec 8, 2019
Bosonic quantum fields can be simulated with `quantum software' in phase-space. The positive-P, Wigner and Q-function phase-space methods are reviewed. Initial quantum states and boundaries for infinite domains are considered in detail. The quantum i...
Continuous Variables Graph States Shaped as Complex Networks: Optimization and Manipulation
F. Sansavini, V. Parigi·Dec 6, 2019
Complex networks structures have been extensively used for describing complex natural and technological systems, like the Internet or social networks. More recently, complex network theory has been applied to quantum systems, where complex network to...
A Quantum Algorithm for Linear PDEs Arising in Finance
F. Fontanela, Antoine Jacquier, Mugad Oumgari·Dec 5, 2019
We propose a hybrid quantum-classical algorithm, originated from quantum chemistry, to price European and Asian options in the Black-Scholes model. Our approach is based on the equivalence between the pricing partial differential equation and the Sch...
Reducing computations in quantum walk algorithms
Asif Shakeel·Dec 2, 2019
Quantum walks (QWs) are of interest as examples of uniquely quantum behavior and are applicable in a variety of quantum search and simulation models. Implementing QWs on quantum devices is useful from both points of view. We describe a prototype one-...
Benchmarking Quantum Computers and the Impact of Quantum Noise
Salonik Resch, Ulya R. Karpuzcu·Dec 2, 2019
Benchmarking is how the performance of a computing system is determined. Surprisingly, even for classical computers this is not a straightforward process. One must choose the appropriate benchmark and metrics to extract meaningful results. Different ...
Efficient modeling of superconducting quantum circuits with tensor networks
A. Di Paolo, T. E. Baker, A. Foley +2 more·Dec 2, 2019
We use a tensor network method to compute the low-energy excitations of a large-scale fluxonium qubit up to a desired accuracy. We employ this numerical technique to estimate the pure-dephasing coherence time of the fluxonium qubit due to charge nois...
Characterizing the boundary of the set of absolutely separable states and their generation via noisy environments
Saronath Halder, S. Mal, Aditi Sen(De)·Nov 29, 2019
We characterize the boundary of the convex compact set of absolutely separable states, referred as AS, that cannot be transformed to entangled states by global unitary operators, in 2⊗ d Hilbert space. However, we show that the absolutely separable s...
Path-Independent Quantum Gates with Noisy Ancilla.
Wen-Long Ma, Mengzhen Zhang, Yat Wong +5 more·Nov 27, 2019
Ancilla systems are often indispensable to universal control of a nearly isolated quantum system. However, ancilla systems are typically more vulnerable to environmental noise, which limits the performance of such ancilla-assisted quantum control. To...
Performance optimisation for drift-robust fidelity improvement of two-qubit gates.
G. White, C. Hill, L. Hollenberg·Nov 27, 2019
Quantum system characterisation techniques represent the front-line in the identification and mitigation of noise in quantum computing, but can be expensive in terms of quantum resources and time to repeatedly employ. Another challenging aspect is th...
Protecting quantum coherences from static noise and disorder
Chahan M. Kropf·Nov 26, 2019
Quantum coherences are paramount resources for applications, such as quantum-enhanced light-harvesting or quantum computing, which are fragile against environmental noise. We here derive generalized quantum master equations using perturbation theory ...
Algorithm for automated tuning of a quantum dot into the single-electron regime
M. Lapointe-Major, Olivier Germain, J. C. Lemyre +4 more·Nov 26, 2019
We report an algorithm designed to perform computer-automated tuning of a single quantum dot with a charge sensor. The algorithm performs an adaptive measurement sequence of sub-sized stability diagrams until the single-electron regime is identified ...
Suppressing charge-noise sensitivity in high-speed Ge hole spin-orbit qubits
Zhanning Wang, E. Marcellina, A. Hamilton +3 more·Nov 25, 2019
Strong spin-orbit interactions make hole quantum dots central to the quest for electrical spin qubit manipulation enabling fast, low-power, scalable quantum computation. Yet it is important to establish to what extent spin-orbit coupling may expose t...
Local certification of programmable quantum devices of arbitrary high dimensionality
Kishor Bharti, Maharshi Ray, Antonios Varvitsiotis +2 more·Nov 21, 2019
The onset of the era of fully-programmable error-corrected quantum computers will be marked by major breakthroughs in all areas of science and engineering. These devices promise to have significant technological and societal impact, notable examples ...
MUQUT: Multi-Constraint Quantum Circuit Mapping on Noisy Intermediate-Scale Quantum Computers
Debjyoti Bhattacharjee, A. Saki, M. Alam +2 more·Nov 16, 2019
Rapid advancement in the domain of quantum technologies has opened up researchers to the real possibility of experimenting with quantum circuits and simulating small-scale quantum programs. Nevertheless, the quality of currently available qubits and ...
NISQ computing for decision making under uncertainty
H. Naus·Nov 14, 2019
Noisy Intermediate-Scale Quantum computers are expected to be available this year. It is proposed to exploit such a device for decision making under uncertainty. The probabilistic character of quantum mechanics reflects this uncertainty. Concomitantl...