Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Neural Decoder for Topological Codes using Pseudo-Inverse of Parity Check Matrix
C. Chinni, Abhishek Kulkarni, Dheeraj M. Pai +2 more·Jan 21, 2019
Recent developments in the field of deep learning have motivated many researchers to apply these methods to problems in quantum information. Torlai and Melko first proposed a decoder for surface codes based on neural networks. Since then, many other ...
Message-passing algorithm of quantum annealing with nonstoquastic Hamiltonian
Masayuki Ohzeki·Jan 21, 2019
Quantum annealing (QA) is a generic method for solving optimization problems using fictitious quantum fluctuation. The current device performing QA involves controlling the transverse field; it is classically simulatable by using the standard techniq...
Floating-Point Calculations on a Quantum Annealer: Division and Matrix Inversion
M. Rogers, R. Singleton·Jan 19, 2019
Systems of linear equations are employed almost universally across a wide range of disciplines, from physics and engineering to biology, chemistry, and statistics. Traditional solution methods such as Gaussian elimination are very time consuming for ...
The quantum algorithm for graph isomorphism problem
Xi Li, Hanwu Chen·Jan 19, 2019
The graph isomorphism (GI) problem is the computational problem of finding a permutation of vertices of a given graph $G_1$ that transforms $G_1$ to another given graph $G_2$ and preserves the adjacency. In this work, we propose a quantum algorithm t...
The Asymptotic Complexity of Coded-BKW with Sieving Using Increasing Reduction Factors
Erik Mårtensson·Jan 19, 2019
The Learning with Errors problem (LWE) is one of the main candidates for post-quantum cryptography. At Asiacrypt 2017, coded-BKW with sieving, an algorithm combining the Blum-Kalai-Wasserman algorithm (BKW) with lattice sieving techniques, was propos...
Thermal entanglement and thermal discord in two-qubit Heisenberg XYZ chain with Dzyaloshinskii–Moriya interactions
Daekil Park·Jan 18, 2019
In order to explore the effect of external temperature T in quantum correlation, we compute thermal entanglement and thermal discord analytically in the Heisenberg XYZ model with Dzyaloshinskii–Moriya interaction term D·σ1×σ2\documentclass[12pt]{mini...
Statistical Mechanics and the Ghosts of Departed Quantities
G. Ord·Jan 17, 2019
Quantum mechanics appears to contain ghosts from both classical statistical mechanics and special relativity. On one hand, both the Dirac and Schr\"{o}dinger equations have classical analogs that emerge directly from classical statistical mechanics, ...
Phase-engineered bosonic quantum codes
Linshu Li, Dylan J. Young, Victor V. Albert +3 more·Jan 16, 2019
Continuous-variable systems protected by bosonic quantum error-correcting codes have emerged as a promising platform for quantum information processing. To date, design of codewords has centered on optimizing the occupation of basis states in the err...
Gradient-based optimal control of open quantum systems using quantum trajectories and automatic differentiation
Mohamed Abdelhafez, D. Schuster, J. Koch·Jan 16, 2019
We present a gradient-based optimal-control technique for open quantum systems that utilizes quantum trajectories to simulate the quantum dynamics during optimization. Using trajectories allows for optimizing open systems with less computational cost...
Quantum-Teleportation-Inspired Algorithm for Sampling Large Random Quantum Circuits.
Ming-Cheng Chen, Riling Li, L. Gan +4 more·Jan 15, 2019
Quantum teleportation transfers and processes quantum information through quantum entanglement channels. It is one of the most versatile protocols in quantum information science and leads to many remarkable applications, particularly the one-way quan...
Analytically Computable Symmetric Quantum Correlations
Li-qiang Zhang, Si-ren Yang, Chang-shui Yu·Jan 15, 2019
One of the greatest challenges in developing the resource theory of a quantum feature is to establish an analytically computable quantifier, which directly limits the practicability of such quantifiers. Here, analytic quantifiers of both the symmetri...
Quantum chemistry on quantum annealers
Scott N. Genin, I. G. Ryabinkin, A. Izmaylov·Jan 15, 2019
Quantum chemistry calculations for small molecules on quantum hardware have been demonstrated to date only on universal-gate quantum computers, not quantum annealers. The latter devices are limited to finding the lowest eigenstate of the Ising Hamilt...
Separation and approximate separation of multipartite quantum gates
K. He, Shusen Liu, J. Hou·Jan 15, 2019
The number of qubits of current quantum computers is one of the most dominating restrictions for applications. So it is naturally conceived to use two or more small capacity quantum computers to form a larger capacity quantum computing system by quan...
Optimized Lie–Trotter–Suzuki decompositions for two and three non-commuting terms
T. Barthel, Yikang Zhang·Jan 15, 2019
Lie-Trotter-Suzuki decompositions are an efficient way to approximate operator exponentials $\exp(t H)$ when $H$ is a sum of $n$ (non-commuting) terms which, individually, can be exponentiated easily. They are employed in time-evolution algorithms fo...
Single-Shot Readout Performance of Two Heterojunction-Bipolar-Transistor Amplification Circuits at Millikelvin Temperatures
M. Curry, M. Curry, Martin Rudolph +15 more·Jan 14, 2019
High-fidelity single-shot readout of spin qubits requires distinguishing states much faster than the T1 time of the spin state. One approach to improving readout fidelity and bandwidth (BW) is cryogenic amplification, where the signal from the qubit ...
Experimental Evidence about "A factorisation algorithm in adiabatic quantum computation" by T. D. Kieu
R. H. Warren·Jan 14, 2019
Computations show that the logic about a quantum factoring algorithm does not hold in reality on a D-Wave quantum computer. We demonstrate this for the integers 15 = 3 x 5, 91 = 7 x 13 and 899 = 29 x 31. The likely cause is the D-Wave hardware that d...
Quantum computing with sine-Gordon qubits
Dongsheng Wang·Jan 14, 2019
A universal quantum computing scheme, with a universal set of logical gates, is proposed based on networks of 1D quantum systems. The encoding of information is in terms of universal features of gapped phases, for which effective field theories such ...
Quadratization in discrete optimization and quantum mechanics
N. Dattani·Jan 14, 2019
A book about turning high-degree optimization problems into quadratic optimization problems that maintain the same global minimum (ground state). This book explores quadratizations for pseudo-Boolean optimization, perturbative gadgets used in QMA com...
Trajectory optimization using quantum computing
Alok Shukla, P. Vedula·Jan 14, 2019
We present a framework wherein the trajectory optimization problem (or a problem involving calculus of variations) is formulated as a search problem in a discrete space. A distinctive feature of our work is the treatment of discretization of the opti...
Anatomy of entanglement and nonclassicality criteria
Mehmet Emre Tasgin·Jan 13, 2019
We examine the internal structure of two-mode entanglement criteria for quadrature- and number-phase-squeezed states. For criteria obtained from the partial transpose of the Schrödinger--Robertson inequality, we show that the additional covariance te...