Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Succinct Description and Efficient Simulation of Non-Markovian Open Quantum Systems
Xiantao Li, Chunhao Wang·Nov 5, 2021
Non-Markovian open quantum systems represent the most general dynamics when the quantum system is coupled with a bath environment. The quantum dynamics arising from many important applications are non-Markovian. Although for special cases, such as Ha...
Solving the Sampling Problem of the Sycamore Quantum Circuits.
Feng Pan, Keyang Chen, P. Zhang·Nov 4, 2021
We study the problem of generating independent samples from the output distribution of Google's Sycamore quantum circuits with a target fidelity, which is believed to be beyond the reach of classical supercomputers and has been used to demonstrate qu...
Time-dependent Hamiltonian Simulation of Highly Oscillatory Dynamics
Dong An, Di Fang, Lin Lin·Nov 4, 2021
We propose a simple quantum algorithm for simulating highly oscillatory quantum dynamics, which does not require complicated quantum control logic for handling time-ordering operators. To our knowledge, this is the first quantum algorithm that is bot...
Strategies to simulate dephasing-assisted quantum transport on digital quantum computers
Federico Gallina, Matteo Bruschi, B. Fresch·Nov 4, 2021
Simulating charge and energy transfer in extended molecular networks requires an effective model to include the environment because it significantly affects the quantum dynamics. A prototypical effect known as environment-assisted quantum transport (...
Benchmarking of quantum protocols
Chin-te Liao, S. Bahrani, Francisco Ferreira da Silva +1 more·Nov 3, 2021
Quantum network protocols offer new functionalities such as enhanced security to communication and computational systems. Despite the rapid progress in quantum hardware, it has not yet reached a level of maturity that enables execution of many quantu...
Absolutely Stable Spatiotemporal Order in Noisy Quantum Systems.
Max McGinley, Sthitadhi Roy, S. Parameswaran·Nov 3, 2021
We introduce a model of nonunitary quantum dynamics that exhibits infinitely long-lived discrete spatiotemporal order robust against any unitary or dissipative perturbation. Ergodicity is evaded by combining a sequence of projective measurements with...
NISQ: Error Correction, Mitigation, and Noise Simulation
Ningping Cao, Junan Lin, D. Kribs +3 more·Nov 3, 2021
Error-correcting codes were invented to correct errors on noisy communication channels. Quantum error correction (QEC), however, may have a wider range of uses, including information transmission, quantum simulation/computation, and fault-tolerance. ...
Simulations of Quantum Circuits with Approximate Noise using qsim and Cirq
S. Isakov, D. Kafri, O. Martin +15 more·Nov 3, 2021
We introduce multinode quantum trajectory simulations with qsim, an open source high performance simulator of quantum circuits. qsim can be used as a backend of Cirq, a Python software library for writing quantum circuits. We present a novel delayed ...
Electron cloud design for Rydberg multi-qubit gates
M. Khazali, W. Lechner·Nov 2, 2021
This article proposes quantum processing in an optical lattice, using Rydberg electron’s Fermi scattering from ground-state atoms in spin-dependent lattices as a source of interaction. Instead of relying on Rydberg pair potentials, the interaction is...
Redefining the Quantum Supremacy Baseline With a New Generation Sunway Supercomputer
Xin Liu, Chu Guo, Yong Liu +11 more·Nov 1, 2021
A major milestone in the era of noisy intermediate scale quantum computers is \textit{quantum supremacy} [Nature \textbf{574}, 505 (2019)] claimed on the Sycamore quantum processor of $53$ qubits, which can perform a random circuit sampling task with...
RosneT: A Block Tensor Algebra Library for Out-of-Core Quantum Computing Simulation
Sergio Sánchez Ramírez, Javier Conejero, Francesc Lordan +4 more·Nov 1, 2021
With the advent of more powerful Quantum Computers, the need for larger Quantum Simulations has boosted. As the amount of resources grows exponentially with size of the target system Tensor Networks emerge as an optimal framework with which we repres...
Optimized Quantum Program Execution Ordering to Mitigate Errors in Simulations of Quantum Systems
T. Tomesh, Kaiwen Gui, P. Gokhale +4 more·Nov 1, 2021
Simulating the time evolution of a physical system at quantum mechanical levels of detail - known as Hamiltonian Simulation (HS) - is an important and interesting problem across physics and chemistry. For this task, algorithms that run on quantum com...
HybridQ: A Hybrid Simulator for Quantum Circuits
S. Mandrà, Jeffrey Marshall, E. Rieffel +1 more·Nov 1, 2021
Developing state-of-the-art classical simulators of quantum circuits is of utmost importance to test and evaluate early quantum technology and understand the true potential of full-blown error-corrected quantum computers. In the past few years, multi...
Small-world complex network generation on a digital quantum processor
E. Jones, Logan E. Hillberry, Matthew T. Jones +9 more·Oct 30, 2021
Quantum cellular automata (QCA) evolve qubits in a quantum circuit depending only on the states of their neighborhoods and model how rich physical complexity can emerge from a simple set of underlying dynamical rules. The inability of classical compu...
Platform tailored codesign of gate-based quantum simulation
K. Seetharam, Dries Sels, E. Demler·Oct 29, 2021
The utility of near-term quantum computers and simulators is likely to rely upon software-hardware codesign, with error-aware algorithms and protocols optimized for the platforms they are run on. Here, we show how knowledge of noise in a system can b...
Quantum Hamiltonian complexity in thermal equilibrium
S. Bravyi, Anirban Narayan Chowdhury, David Gosset +1 more·Oct 29, 2021
The physical properties of a quantum many-body system in thermal equilibrium are determined by its partition function and free energy. Here we study the computational complexity of approximating these quantities for n-qubit local Hamiltonians. First,...
Quantum-Classical Computational Molecular Design of Deuterated High-Efficiency OLED Emitters
Qi Gao, Gavin O. Jones, M. Sugawara +5 more·Oct 28, 2021
This study describes a hybrid quantum-classical computational approach for designing synthesizable deuterated $Alq_3$ emitters possessing desirable emission quantum efficiencies (QEs). This design process has been performed on the tris(8-hydroxyquino...
Measurement-based time evolution for quantum simulation of fermionic systems
Woojun Lee, Zhangjie Qin, R. Raussendorf +2 more·Oct 27, 2021
Quantum simulation using time evolution in phase estimation-based quantum algorithms can yield unbiased solutions of classically intractable models. However, long runtimes open such algorithms to decoherence. We show how measurement-based quantum sim...
Closing the “Quantum Supremacy” Gap: Achieving Real-Time Simulation of a Random Quantum Circuit Using a New Sunway Supercomputer
Yong Liu, Xin Liu, Fang Li +11 more·Oct 27, 2021
We develop a high-performance tensor-based simulator for random quantum circuits(RQCs) on the new Sunway supercomputer. Our major innovations include: (1) a near-optimal slicing scheme, and a path-optimization strategy that considers both complexity ...
Russo–dye type theorem, Stinespring representation, and Radon–Nikodým derivative for invariant block multilinear completelypositive maps
Anindya Ghatak, A. Sensarma·Oct 26, 2021
In this article, we investigate certain basic properties of invariant multilinear CP maps. For instance, we prove Russo–Dye type theorem for invariant multilinear positive maps on both commutative C∗\documentclass[12pt]{minimal} \usepackage{amsmath} ...