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 simulation of cosmic inflation
Junyu Liu, Yue Li·Sep 23, 2020
In this paper, we generalize Jordan-Lee-Preskill, an algorithm for simulating flat-space quantum field theories, to 3+1 dimensional inflationary spacetime. The generalized algorithm contains the encoding treatment, the initial state preparation, the ...
Fast Black-Box Quantum State Preparation
Johannes Bausch·Sep 22, 2020
Quantum state preparation is an important ingredient for other higher-level quantum algorithms, such as Hamiltonian simulation, or for loading distributions into a quantum device to be used e.g. in the context of optimization tasks such as machine le...
Variational simulation of Schwinger's Hamiltonian with polarization qubits
O. V. Borzenkova, G. Struchalin, A. Kardashin +5 more·Sep 21, 2020
The numerical emulation of quantum physics and quantum chemistry often involves an intractable number of degrees of freedom and admit no known approximations in a general form. In practice, representing quantum-mechanical states using available numer...
Towards quantum simulation of spin systems using continuous variable quantum devices
Razieh Annabestani, Brajesh Gupt, Bhaskar Roy Bardhan·Sep 20, 2020
We study Bosonic representation of spin Ising model with the application of simulating two level systems using continuous variable quantum processors. We decompose the time evolution of spin systems into a sequence of continuous variable logical gate...
Exploring a Double Full-Stack Communications-Enabled Architecture for Multi-Core Quantum Computers
Santiago Rodrigo, S. Abadal, E. Alarcón +1 more·Sep 17, 2020
Being a very promising technology, with impressive advances in the recent years, it is still unclear how quantum computing will scale to satisfy the requirements of its most powerful applications. Although continued progress in the fabrication and co...
Light-Front Field Theory on Current Quantum Computers
Michael Kreshchuk, Shaoyang Jia, William M. Kirby +3 more·Sep 16, 2020
We present a quantum algorithm for simulation of quantum field theory in the light-front formulation and demonstrate how existing quantum devices can be used to study the structure of bound states in relativistic nuclear physics. Specifically, we app...
Nonlinear quantum search via coined quantum walks
Basile Herzog, G. Molfetta·Sep 16, 2020
We provide first evidence that some families of nonlinear quantum systems, rephrased in terms of coined quantum walks with effective nonlinear phase, display a strong computational advantage for search algorithms, over graphs having sets of vertices ...
Quantum Optimization for the Graph Coloring Problem with Space-Efficient Embedding
Zsolt I. Tabi, Kareem H. El-Safty, Zsófia Kallus +4 more·Sep 15, 2020
Current quantum computing devices have different strengths and weaknesses depending on their architectures. This means that flexible approaches to circuit design are necessary. We address this task by introducing a novel space-efficient quantum optim...
Evidence for long-distance superexchange between semiconductor quantum-dot electron spins
Haifeng Qiao, Y. Kandel, S. Fallahi +4 more·Sep 13, 2020
Due to their long coherence times and potential for scalability, semiconductor quantum-dot spin qubits hold great promise for quantum information processing. However, maintaining high connectivity between quantum-dot spin qubits, which favor linear a...
Limitations of optimization algorithms on noisy quantum devices
Daniel Stilck França, R. García-Patrón·Sep 11, 2020
Recent successes in producing intermediate-scale quantum devices have focused interest on establishing whether near-term devices could outperform classical computers for practical applications. A central question is whether noise can be overcome in t...
Feynman-path-type simulation using stabilizer projector decomposition of unitaries
Yifei Huang, P. Love·Sep 10, 2020
We propose a classical simulation method for quantum circuits based on decomposing unitary gates into a sum of stabilizer projectors. By only decomposing the non-Clifford gates, we take advantage of the Gottesman-Knill theorem and build a bridge betw...
Near- and long-term quantum algorithmic approaches for vibrational spectroscopy
Nicolas P. D. Sawaya, F. Paesani, Daniel P. Tabor·Sep 10, 2020
Determining the vibrational structure of a molecule is central to fundamental applications in several areas, from atmospheric science to catalysis, fuel combustion modeling, biochemical imaging, and astrochemistry. However, when significant anharmoni...
Enhancing the Quantum Linear Systems Algorithm Using Richardson Extrapolation
Almudena Carrera Vazquez, R. Hiptmair, Stefan Woerner·Sep 9, 2020
We present a quantum algorithm to solve systems of linear equations of the form Ax=b, where A is a tridiagonal Toeplitz matrix and b results from discretizing an analytic function, with a circuit complexity of O(1/√ε, poly (log κ, log N)), where N de...
Design of a quantum repeater using quantum circuits and benchmarking its performance on an IBM quantum computer
Sowmitra Das, Md. Saifur Rahman, Mahbubon N. Majumdar·Sep 9, 2020
Quantum communication relies on the existence of entanglement between two nodes of a network. However, due to its fragile nature, it is nearly impossible to establish entanglement at large distances through the direct transmission of qubits. Quantum ...
A four-qubit germanium quantum processor
N. Hendrickx, W. Lawrie, M. Russ +6 more·Sep 9, 2020
The prospect of building quantum circuits1,2 using advanced semiconductor manufacturing makes quantum dots an attractive platform for quantum information processing3,4. Extensive studies of various materials have led to demonstrations of two-qubit lo...
Simulation of wave-particle duality in multipath interferometers on a quantum computer
Mirko Amico, Christoph Dittel·Sep 8, 2020
We present an architecture to investigate wave-particle duality in $N$-path interferometers on a universal quantum computer involving as low as $2{log}_{2}N$ qubits and develop a measurement scheme that allows the efficient extraction of quantifiers ...
Fast simulation of planar Clifford circuits
David Gosset, D. Grier, A. Kerzner +1 more·Sep 7, 2020
A general quantum circuit can be simulated classically in exponential time. If it has a planar layout, then a tensor-network contraction algorithm due to Markov and Shi has a runtime exponential in the square root of its size, or more generally expon...
Efficient calculation of gradients in classical simulations of variational quantum algorithms
Tyson Jones, Julien Gacon·Sep 6, 2020
Calculating the energy gradient in parameter space has become an almost ubiquitous subroutine of variational near-term quantum algorithms. "Faithful" classical emulation of this subroutine mimics its quantum evaluation, and scales as O(P^2) gate oper...
Variational Hamiltonian Diagonalization for Dynamical Quantum Simulation
Benjamin Commeau, M. Cerezo, Zoe Holmes +3 more·Sep 5, 2020
Dynamical quantum simulation may be one of the first applications to see quantum advantage. However, the circuit depth of standard Trotterization methods can rapidly exceed the coherence time of noisy quantum computers. This has led to recent proposa...
Virtualized Logical Qubits: A 2.5D Architecture for Error-Corrected Quantum Computing
Casey Duckering, Jonathan M. Baker, D. Schuster +1 more·Sep 4, 2020
Current, near-term quantum devices have shown great progress in the last several years culminating recently with a demonstration of quantum supremacy. In the medium-term, however, quantum machines will need to transition to greater reliability throug...