Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Quantum Algorithms, Architecture, and Error Correction
C. Ryan-Anderson·Dec 11, 2018
Quantum algorithms have the potential to provide exponential speedups over some of the best known classical algorithms. These speedups may enable quantum devices to solve currently intractable problems such as those in the fields of optimization, mat...
Universal quantum computing with thermal state bosonic systems
K. Marshall, D. James, A. Paler +1 more·Dec 10, 2018
Recent development of mixed-state encoding (MSE) allows pure-state logical information to be encoded by a bosonic (continuous-variable) system in mixed physical state. Despite interest due to its counterintuitiveness, the utility of the current MSE s...
High-Threshold Code for Modular Hardware With Asymmetric Noise
Xiaosi Xu, Qi Zhao, Xiao Yuan +1 more·Dec 4, 2018
We consider an approach to fault tolerant quantum computing based on a simple error detecting code operating as the substrate for a conventional surface code. We develop a customised decoder to process the information about the likely location of err...
Complete list of tight Bell inequalities for two parties with four binary settings
E. Z. Cruzeiro, N. Gisin·Nov 28, 2018
We give the complete list of 175 facets of the local polytope for the case where Alice and Bob each choose their measurements from a set of four binary outcome measurements. For each inequality we compute the maximum quantum violation for qubits, the...
Accrediting outputs of noisy intermediate-scale quantum computing devices
Samuele Ferracin, Theodoros Kapourniotis, A. Datta·Nov 24, 2018
We present an accreditation protocol for the outputs of noisy intermediate-scale quantum devices. By testing entire circuits rather than individual gates, our accreditation protocol can provide an upper-bound on the variation distance between noisy a...
Geometric formalism for constructing arbitrary single-qubit dynamically corrected gates
Junkai Zeng, C. Yang, A. Dzurak +1 more·Nov 12, 2018
Implementing high-fidelity quantum control and reducing the effect of the coupling between a quantum system and its environment is a major challenge in developing quantum information technologies. Here, we show that there exists a geometrical structu...
Non-Markovianity is not a resource for quantum spatial search on a star graph subject to generalized percolation
M. Rossi, M. Cattaneo, M. Paris +1 more·Nov 12, 2018
Abstract Continuous-time quantum walks may be exploited to enhance spatial search, i.e., for finding a marked element in a database structured as a complex network. However, in practical implementations, the environmental noise has detrimental effect...
Quantitative robustness analysis of quantum programs
S. Hung, Kesha Hietala, Shaopeng Zhu +3 more·Nov 8, 2018
Quantum computation is a topic of significant recent interest, with practical advances coming from both research and industry. A major challenge in quantum programming is dealing with errors (quantum noise) during execution. Because quantum resources...
Temporally correlated error tomography and mitigation in quantum computer
M. Huo, Ying Li·Nov 7, 2018
The error model of a noisy quantum computer is important for optimizing the quantum error correction protocol, and a highly accurate error model is vital to high-fidelity quantum computation on intermediate-scale quantum devices. The way to minimize ...
Robust quantum compilation and circuit optimisation via energy minimisation
Tyson Jones, S. Benjamin·Nov 7, 2018
We explore a method for automatically recompiling a quantum circuit A into a target circuit B, with the goal that both circuits have the same action on a specific input i.e. B∣in⟩=A∣in⟩. This is of particular relevance to hybrid, NISQ-era algorithms ...
Ancilla-Free Quantum Error Correction Codes for Quantum Metrology.
David Layden, Sisi Zhou, P. Cappellaro +1 more·Nov 4, 2018
Quantum error correction has recently emerged as a tool to enhance quantum sensing under Markovian noise. It works by correcting errors in a sensor while letting a signal imprint on the logical state. This approach typically requires a specialized er...
Fault-tolerant protection of near-term trapped-ion topological qubits under realistic noise sources
A. Bermudez, Xiaosi Xu, Mauricio Gutiérrez +3 more·Oct 22, 2018
Taking into account an increasingly realistic noise model, a low-resource toolbox of fault-tolerant quantum error detection and correction scheme is provided. By extensive numerical simulations, a thorough microscopic characterization is performed, s...
Reinforcement learning decoders for fault-tolerant quantum computation
R. Sweke, Markus S. Kesselring, E. van Nieuwenburg +1 more·Oct 16, 2018
Topological error correcting codes, and particularly the surface code, currently provide the most feasible road-map towards large-scale fault-tolerant quantum computation. As such, obtaining fast and flexible decoding algorithms for these codes, with...
Scaled Quantum Circuits Emulated with Room Temperature p-Bits
Kerem Y Çamsarı, S. Chowdhury, S. Datta·Oct 16, 2018
Exploiting a well-established mapping from a d-dimensional quantum Hamiltonian to a d+1dimensional classical Hamiltonian that is commonly used in software quantum Monte Carlo algorithms, we propose a scalable hardware emulator where quantum circuits ...
Chip-Integrated Voltage Sources for Control of Trapped Ions
J. Stuart, R. Panock, C. Bruzewicz +5 more·Oct 16, 2018
Trapped-ion quantum information processors offer many advantages for achieving high-fidelity operations on a large number of qubits, but current experiments require bulky external equipment for classical and quantum control of many ions. We demonstra...
Constant Time Quantum search Algorithm Over A Datasets: An Experimental Study Using IBM Q Experience
Kunal Das, Arindam Sadhu·Oct 8, 2018
In this work, a constant time Quantum searching algorithm over a datasets is proposed and subsequently the algorithm is executed in real chip quantum computer developed by IBM Quantum experience (IBMQ). QISKit, the software platform developed by IBM ...
Numerical study of hypergraph product codes
Antoine Grospellier, Anirudh Krishna·Oct 8, 2018
Hypergraph product codes introduced by Tillich and Zemor are a class of quantum LDPC codes with constant rate and distance scaling with the square-root of the block size. Quantum expander codes, a subclass of these codes, can be decoded using the lin...
Wavelength assignment in quantum access networks with hybrid wireless-fiber links
S. Bahrani, Osama Elmabrok, Guillermo Curr'as-Lorenzo +1 more·Oct 3, 2018
We propose a low-complexity near-optimal wavelength allocation technique for quantum key distribution access networks that rely on wavelength division multiple access. Such networks would allow users to send quantum and classical signals simultaneous...
Density-Matrix Simulation of Logical Qubit using 3-qubit Quantum Error Correction Code
Chungheon Baek, T. Ostuka, S. Tarucha +1 more·Oct 2, 2018
Fault-tolerant quantum computing demands many qubits with long lifetimes to conduct accurate quantum gate operations. However, external noise limits the computing time of physical qubits. Quantum error correction codes may extend such limits, but imp...
Robustness of the concatenated quantum error-correction protocol against noise for channels affected by fluctuation
Long Huang, Xiaohua Wu, T. Zhou·Sep 30, 2018
In quantum error correction, the description of noise channel cannot be completely accurate, and fluctuation always appears in noise channel. It is found that when fluctuation of physical noise channel is considered, the average effective channel is ...