Papers
Live trends in quantum computing research, updated daily from arXiv.
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15,859 papers in 12 months (-35% vs prior quarter)
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Fault-tolerant quantum error correction for Steane’s seven-qubit color code with few or no extra qubits
B. Reichardt·Apr 19, 2018
Steane’s seven-qubit quantum code is a natural choice for fault-tolerance experiments because it is small and just two extra qubits are enough to correct errors. However, the two-qubit error-correction technique, known as ‘flagged’ syndrome extractio...
Contextuality as a resource for measurement-based quantum computation beyond qubits
Markus Frembs, Sam Roberts, S. Bartlett·Apr 19, 2018
Contextuality—the obstruction to describing quantum mechanics in a classical statistical way—has been proposed as a resource that powers quantum computing. The measurement-based model provides a concrete manifestation of contextuality as a computatio...
Quantum state preparation by a shaped photon pulse in a one-dimensional continuum
Zeyang Liao, M. Zubairy·Apr 19, 2018
We propose a method to deterministically prepare a desired quantum state in a one-dimensional (1D) continuum by a shaped photon pulse. This method is based on time-reverse of the quantum emission process. We show that the desired quantum state such a...
Accounting for errors in quantum algorithms via individual error reduction
M. Otten, S. Gray·Apr 19, 2018
We discuss a surprisingly simple scheme for accounting (and removal) of error in observables determined from quantum algorithms. A correction to the value of the observable is calculated by first measuring the observable with all error sources active...
Hamiltonian surgery: Cheeger-type gap inequalities for nonpositive (stoquastic), real, and Hermitian matrices
Michael Jarret·Apr 18, 2018
Cheeger inequalities bound the spectral gap $\gamma$ of a space by isoperimetric properties of that space and vice versa. In this paper, I derive Cheeger-type inequalities for nonpositive matrices (aka stoquastic Hamiltonians), real matrices, and Her...
A voting scheme with post-quantum security based on physical laws
Hua Dong, Li Yang·Apr 18, 2018
Traditional cryptography is under huge threat along of the evolution of quantum information and computing. In this paper, we propose a new post-quantum voting scheme based on physical laws by using encrypted no-key protocol to transmit message in the...
Effects of gate errors in digital quantum simulations of fermionic systems
Jan-Michael Reiner, S. Zanker, Iris Schwenk +4 more·Apr 18, 2018
Digital quantum simulations offer exciting perspectives for the study of fermionic systems such as molecules or lattice models. However, with quantum error correction still being out of reach for systems of interesting size, a non-vanishing error rat...
A simple protocol for fault tolerant verification of quantum computation
A. Gheorghiu, M. Hoban, E. Kashefi·Apr 17, 2018
With experimental quantum computing technologies now in their infancy, the search for efficient means of testing the correctness of these quantum computations is becoming more pressing. An approach to the verification of quantum computation within th...
Quantum computation is the unique reversible circuit model for which bits are balls
Marius Krumm, Markus P. Müller·Apr 16, 2018
The computational efficiency of quantum mechanics can be characterized in terms of the qubit circuit model, which is defined by a few simple properties: each computational gate is a reversible transformation in a connected matrix group; single wires ...
Quantum computing methods for electronic states of the water molecule
Teng Bian, Daniel Murphy, Rongxin Xia +2 more·Apr 15, 2018
ABSTRACT We compare recently proposed methods to compute the electronic state energies of the water molecule on a quantum computer. The methods include the phase estimation algorithm based on Trotter decomposition, the phase estimation algorithm base...
Simulating Quantum Circuits by Shuffling Paulis
Patrick Rall·Apr 15, 2018
Verification of NISQ era quantum devices demands fast classical simulation of large noisy quantum circuits. We present an algorithm based on the stabilizer formalism that can efficiently simulate noisy stabilizer circuits. Additionally, the protocol ...
Logic Blog 2017
A. Nies·Apr 15, 2018
The blog is somewhat shorter than in previous years, It contains new insights in a variety of areas, including computability, quantum algorithmic version of the SMB theorem, descriptions of groups (both discrete and profinite), metric spaces. There a...
Optimizing a Polynomial Function on a Quantum Simulator.
Keren Li, Shijie Wei, Fei-Hao Zhang +5 more·Apr 14, 2018
Gradient descent method, as one of the major methods in numerical optimization, is the key ingredient in many machine learning algorithms. As one of the most fundamental way to solve the optimization problems, it promises the function value to move a...
Improvements in Quantum SDP-Solving with Applications
Joran van Apeldoorn, András Gilyén·Apr 13, 2018
Following the first paper on quantum algorithms for SDP-solving by Brand\~ao and Svore in 2016, rapid developments has been made on quantum optimization algorithms. Recently Brand\~ao et al. improved the quantum SDP-solver in the so-called quantum st...
Quantum state redistribution with local coherence
Anurag Anshu, Rahul Jain, A. Streltsov·Apr 13, 2018
Quantum entanglement and coherence are two fundamental resources for quantum information processing. Recent results clearly demonstrate their relevance in quantum technological tasks, including quantum communication and quantum algorithms. In this Le...
Quantum Supremacy Circuit Simulation on Sunway TaihuLight
Riling Li, Bujiao Wu, M. Ying +2 more·Apr 13, 2018
With the rapid progress made by industry and academia, quantum computers with dozens of qubits or even larger size are being realized. However, the fidelity of existing quantum computers often sharply decreases as the circuit depth increases. Thus, a...
Entanglement Generation in Superconducting Qubits Using Holonomic Operations
D. Egger, M. Ganzhorn, G. Salis +6 more·Apr 13, 2018
We investigate a non-adiabatic holonomic operation that enables us to entangle two fixed-frequency superconducting transmon qubits attached to a common bus resonator. Two coherent microwave tones are applied simultaneously to the two qubits and drive...
Two-mode squeezing operator in circuit QED
E. C. Diniz, D. Z. Rossatto, C. Villas-Bôas·Apr 12, 2018
We theoretically investigate the implementation of the two-mode squeezing operator in circuit quantum electrodynamics. Inspired by a previous scheme for optical cavities (Prado et al. in Phys Rev A 73:043803, 2006), we employ a superconducting qubit ...
Efficient Algorithms for Tensor Scaling, Quantum Marginals, and Moment Polytopes
Peter Bürgisser, Cole Franks, A. Garg +3 more·Apr 12, 2018
We present a polynomial time algorithm to approximately scale tensors of any format to arbitrary prescribed marginals (whenever possible). This unifies and generalizes a sequence of past works on matrix, operator and tensor scaling. Our algorithm pro...
Tracking quantum error correction
Kosuke Fukui, A. Tomita, A. Okamoto·Apr 11, 2018
To implement fault-tolerant quantum computation with continuous variables, the Gottesman--Kitaev--Preskill (GKP) qubit has been recognized as an important technological element. We have proposed a method to reduce the required squeezing level to real...