Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Learning time-dependent noise to reduce logical errors: real time error rate estimation in quantum error correction
M. Huo, Ying Li·Oct 10, 2017
Quantum error correction is important to quantum information processing, which allows us to reliably process information encoded in quantum error correction codes. Efficient quantum error correction benefits from the knowledge of error rates. We prop...
Efficient decoding for the Hayden-Preskill protocol
B. Yoshida, A. Kitaev·Oct 9, 2017
We present two particular decoding procedures for reconstructing a quantum state from the Hawking radiation in the Hayden-Preskill thought experiment. We work in an idealized setting and represent the black hole and its entangled partner by $n$ EPR p...
Schrödinger cat states in circuit QED
S. Girvin·Oct 9, 2017
Circuit quantum electrodynamics (‘circuit QED’) describes the quantum mechanics and quantum optics of superconducting electrical circuits operating in the microwave regime near absolute zero temperature. It is the analog of cavity QED in quantum opti...
A coherent spin–photon interface in silicon
Xiao Mi, M. Benito, S. Putz +4 more·Oct 9, 2017
Electron spins in silicon quantum dots are attractive systems for quantum computing owing to their long coherence times and the promise of rapid scaling of the number of dots in a system using semiconductor fabrication techniques. Although nearest-ne...
From classical to quantum and back: Hamiltonian adaptive resolution path integral, ring polymer, and centroid molecular dynamics.
Karsten Kreis, K. Kremer, R. Potestio +1 more·Oct 9, 2017
Path integral-based methodologies play a crucial role for the investigation of nuclear quantum effects by means of computer simulations. However, these techniques are significantly more demanding than corresponding classical simulations. To reduce th...
Control landscapes for a class of non-linear dynamical systems: sufficient conditions for the absence of traps
Benjamin Russell, Shanon L. Vuglar, H. Rabitz·Oct 9, 2017
We establish three tractable, jointly sufficient conditions for the control landscapes of non-linear dynamical systems to be trap free. Trap free landscapes ensure that local optimization methods (such as gradient ascent) can achieve monotonic conver...
Correcting coherent errors with surface codes
S. Bravyi, Matthias Englbrecht, R. König +1 more·Oct 6, 2017
Surface codes are building blocks of quantum computing platforms based on 2D arrays of qubits responsible for detecting and correcting errors. The error suppression achieved by the surface code is usually estimated by simulating toy noise models desc...
Investigating the electronic properties and structural features of MgH and of MgH−anions
L. González-Sánchez, S. Gómez‐Carrasco, A. M. Santadaría +2 more·Oct 6, 2017
In the present paper we analyze in detail several properties of the ${\mathrm{MgH}}^{\ensuremath{-}}$ anion and the MgH neutral molecule using accurate ab initio quantum computational methods in order to establish with a higher reliability specific m...
Exponential Quantum Speed-ups for Semidefinite Programming with Applications to Quantum Learning
F. Brandão, A. Kalev, Tongyang Li +3 more·Oct 6, 2017
We give semidefinite program (SDP) quantum solvers with an exponential speed-up over classical ones. Specifically, we consider SDP instances with $m$ constraint matrices of dimension $n$, each of rank at most $r$, and assume that the input matrices o...
Environment-assisted analog quantum search
Leonardo Novo, Shantanav Chakraborty, M. Mohseni +1 more·Oct 5, 2017
Two main obstacles for observing quantum advantage in noisy intermediate-scale quantum computers (NISQ) are the finite precision effects due to control errors, or disorders, and decoherence effects due to thermal fluctuations. It has been shown that ...
Deutsch, Toffoli, and CNOT gates via Rydberg blockade of neutral atoms
Xiao-Feng Shi·Oct 5, 2017
Universal quantum gates and quantum error correction~(QEC) lie in the heart of quantum information science. Large-scale quantum computing depends on a universal set of quantum gates, in which some gates may be easily carried out, while others are har...
Quantum optimization using variational algorithms on near-term quantum devices
N. Moll, P. Barkoutsos, L. Bishop +15 more·Oct 3, 2017
Universal fault-tolerant quantum computers will require error-free execution of long sequences of quantum gate operations, which is expected to involve millions of physical qubits. Before the full power of such machines will be available, near-term q...
Simulating the performance of a distance-3 surface code in a linear ion trap
Colin J. Trout, Muyuan Li, Mauricio Gutiérrez +4 more·Oct 3, 2017
We explore the feasibility of implementing a small surface code with 9 data qubits and 8 ancilla qubits, commonly referred to as surface-17, using a linear chain of 171Yb+ ions. Two-qubit gates can be performed between any two ions in the chain with ...
Estimating the decoherence time using non-commutative Functional Inequalities
I. Bardet·Oct 3, 2017
We generalize the notions of the non-commutative Poincar\'e and modified log-Sobolev inequalities for primitive quantum Markov semigroups (QMS) to not necessarily primitive ones. These two inequalities provide estimates on the decoherence time of the...
Learning hard quantum distributions with variational autoencoders
Andrea Rocchetto, Edward Grant, Sergii Strelchuk +2 more·Oct 2, 2017
The exact description of many-body quantum systems represents one of the major challenges in modern physics, because it requires an amount of computational resources that scales exponentially with the size of the system. Simulating the evolution of a...
Neural Networks Architecture Evaluation in a Quantum Computer
A. J. D. Silva, Rodolfo Luan Franco de Oliveira·Oct 1, 2017
In this work, we propose a quantum algorithm to evaluate neural networks architectures named Quantum Neural Network Architecture Evaluation (QNNAE). The proposed algorithm is based on a quantum associative memory and the learning algorithm for artifi...
Universal Constructions for (Co)Relations: categories, monoidal categories, and props
Brendan Fong, F. Zanasi·Oct 1, 2017
Calculi of string diagrams are increasingly used to present the syntax and algebraic structure of various families of circuits, including signal flow graphs, electrical circuits and quantum processes. In many such approaches, the semantic interpretat...
Arbitrable blind quantum computation
Go Sato, Takeshi Koshiba, T. Morimae·Sep 29, 2017
Blind quantum computation (of a single-server case) is a two-party cryptographic protocol which involves a quantum computation server Bob and a client Alice who wants to delegate her quantum computation to Bob without revealing her quantum algorithms...
Adaptive Control of Necklace States in a Photonic Crystal Waveguide
E. Yüce, J. Lian, S. Sokolov +5 more·Sep 29, 2017
Resonant cavities with high quality factor and small mode volume provide crucial enhancement of light–matter interactions in nanophotonic devices that transport and process classical and quantum information. The production of functional circuits cont...
Thermodynamic Analysis of Classical and Quantum Search Algorithms
Ray A. Perlner, Yi-Kai Liu·Sep 29, 2017
We analyze the performance of classical and quantum search algorithms from a thermodynamic perspective, focusing on resources such as time, energy, and memory size. We consider two examples that are relevant to post-quantum cryptography: Grover's sea...