Papers
Live trends in quantum computing research, updated daily from arXiv.
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31,714
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15,749 papers in 12 months (-37% vs prior quarter)
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Robustness of cluster states and surface code states against random local fields
T. Tanamoto, Masahito Ueda·Oct 12, 2019
In ideal quantum circuits, qubits are tacitly assumed to be uniformly fabricated and operated by prescribed signals. In reality, however, we must cope with different control signals to adjust individual qubits, which requires a large overhead of cont...
Calculation of excited states via symmetry constraints in the variational quantum eigensolver
G. Greene‐Diniz, D. M. Ramo·Oct 11, 2019
The variational quantum eigensolver (VQE) requires specification of symmetries that describe the system, e.g. spin and number of electrons. This opens the possibility of using VQE to obtain excited states. In this paper, various unitary coupled clust...
About quantum computer software
Y. Ozhigov·Oct 11, 2019
Quantum computer is the key to controlling complex processes. If its hardware, in general is successfully created on the basis of the physical baggage of the 20th century, the mathematical software is fundamentally lagging behind. Feynman's user inte...
Dynamical mean field theory algorithm and experiment on quantum computers
I. Rungger, Nathan Fitzpatrick, Honxiang Chen +12 more·Oct 10, 2019
The developments of quantum computing algorithms and experiments for atomic scale simulations have largely focused on quantum chemistry for molecules, while their application in condensed matter systems is scarcely explored. Here we present a quantum...
Mapping graph state orbits under local complementation
J. Adcock, S. Morley-Short, A. Dahlberg +1 more·Oct 9, 2019
Graph states, and the entanglement they posses, are central to modern quantum computing and communications architectures. Local complementation – the graph operation that links all local-Clifford equivalent graph states – allows us to classify all st...
Progress towards practical qubit computation using approximate Gottesman-Kitaev-Preskill codes
I. Tzitrin, J. Bourassa, N. Menicucci +1 more·Oct 9, 2019
Encoding a qubit in the continuous degrees of freedom of an oscillator is a promising path to error-corrected quantum computation. One advantageous way to achieve this is through Gottesman-Kitaev-Preskill (GKP) grid states, whose symmetries allow for...
Variational fast forwarding for quantum simulation beyond the coherence time
Cristina Cîrstoiu, Zoe Holmes, Joseph Iosue +3 more·Oct 9, 2019
Trotterization-based, iterative approaches to quantum simulation (QS) are restricted to simulation times less than the coherence time of the quantum computer (QC), which limits their utility in the near term. Here, we present a hybrid quantum-classic...
Robust and efficient algorithms for high-dimensional black-box quantum optimization
Z. Leng, Pranav S. Mundada, Saeed Ghadimi +1 more·Oct 8, 2019
Hybrid quantum-classical optimization using near-term quantum technology is an emerging direction for exploring quantum advantage in high-dimensional systems. However, precise characterization of all experimental parameters is often impractical and c...
Quantum Error Correction
T. Brun·Oct 8, 2019
Quantum error correction is a set of methods to protect quantum information—that is, quantum states—from unwanted environmental interactions (decoherence) and other forms of noise. The information is stored in a quantum error-correcting code, which i...
Quantum linear network coding for entanglement distribution in restricted architectures
N. D. Beaudrap, Steven Herbert·Oct 8, 2019
In this paper we propose a technique for distributing entanglement in architectures in which interactions between pairs of qubits are constrained to a fixed networkG. This allows for two-qubit operations to be performed between qubits which are remot...
Derivation of quantum theory with superselection rules
Kenji Nakahira·Oct 7, 2019
We reconstruct finite-dimensional quantum theory with superselection rules, which can describe hybrid quantum-classical systems, from four purely operational postulates: symmetric sharpness, complete mixing, filtering, and local equality. It has been...
Spectral sparsification of matrix inputs as a preprocessing step for quantum algorithms
Steven Herbert, Sathyawageeswar Subramanian·Oct 7, 2019
We study the potential utility of classical techniques of spectral sparsification of graphs as a preprocessing step for digital quantum algorithms, in particular, for Hamiltonian simulation. Our results indicate that spectral sparsification of a grap...
Challenges and Opportunities of Near-Term Quantum Computing Systems
A. Córcoles, A. Kandala, Ali Javadi-Abhari +6 more·Oct 7, 2019
The concept of quantum computing has inspired a whole new generation of scientists, including physicists, engineers, and computer scientists, to fundamentally change the landscape of information technology. With experimental demonstrations stretching...
The effects of the problem Hamiltonian parameters on the minimum spectral gap in adiabatic quantum optimization
V. Choi·Oct 7, 2019
We study the relation between the Ising problem Hamiltonian parameters and the minimum spectral gap (min-gap) of the system Hamiltonian in the Ising-based quantum annealer. The main criterion we use in this paper to assess the performance of a QA alg...
Resource Estimation for Quantum Variational Simulations of the Hubbard Model
Z. Cai·Oct 7, 2019
As the advances in quantum hardware bring us into the noisy intermediate-scale quantum (NISQ) era, one possible task we can perform without quantum error correction using NISQ machines is the variational quantum eigensolver (VQE) due to its shallow d...
Photonic quantum error correction of linear optics using W-state encoding
Madhav Krishnan Vijayan, A. Lund, P. Rohde·Oct 7, 2019
Error-detection and correction are necessary prerequisites for any scalable quantum computing architecture. Given the inevitability of unwanted physical noise in quantum systems and the propensity for errors to spread as computations proceed, computa...
Space-efficient quantum multiplication of polynomials for binary finite fields with sub-quadratic Toffoli gate count
I. V. Hoof·Oct 7, 2019
Multiplication is an essential step in a lot of calculations. In this paper we look at multiplication of 2 binary polynomials of degree at most n-1, modulo an irreducible polynomial of degree n with 2n input and n output qubits, without ancillary qub...
Optimality of feedback control for qubit purification under inefficient measurement
Yuxiao Jiang, Xiyue Wang, Leigh S. Martin +1 more·Oct 6, 2019
A quantum system may be purified, i.e., projected into a pure state, faster if one applies feedback operations during the measurement process. However existing results suggest that such an enhancement is only possible when the measurement efficiency ...
Template-based Minor Embedding for Adiabatic Quantum Optimization
Thiago Serra, Teng Huang, A. Raghunathan +1 more·Oct 5, 2019
Quantum annealing (QA) can be used to quickly obtain near-optimal solutions for quadratic unconstrained binary optimization (QUBO) problems. In QA hardware, each decision variable of a QUBO should be mapped to one or more adjacent qubits in such a wa...
Unfolding quantum computer readout noise
B. Nachman, M. Urbánek, W. D. de Jong +1 more·Oct 4, 2019
In the current era of noisy intermediate-scale quantum computers, noisy qubits can result in biased results for early quantum algorithm applications. This is a significant challenge for interpreting results from quantum computer simulations for quant...