Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Analysis of quantum information processors using quantum metrology
Mark J. Kandula, P. Kok·Aug 13, 2017
Physical implementations of quantum information processing devices are generally not unique, and we are faced with the problem of choosing the best implementation. Here, we consider the sensitivity of quantum devices to variations in their different ...
Quantum Error Correction using Hypergraph States
Shashanka Balakuntala, G. Paul·Aug 12, 2017
Graph states have been used for quantum error correction by Schlingemann et al. [Physical Review A 65.1 (2001): 012308]. Hypergraph states [Physical Review A 87.2 (2013): 022311] are generalizations of graph states and they have been used in quantum ...
Revisiting integer factorization using closed timelike curves
Soumik Ghosh, Arnab Adhikary, G. Paul·Aug 11, 2017
Closed timelike curves are relativistically valid objects allowing time travel to the past. Treating them as computational objects opens the door to a wide range of results which cannot be achieved using non-relativistic quantum mechanics. Recently, ...
Combinatorial Optimization by Decomposition on Hybrid CPU-non-CPU Solver Architectures
A. Narimani, Seyed Saeed Changiz Rezaei, Arman Zaribafiyan·Aug 11, 2017
The advent of new special-purpose hardware such as FPGA or ASIC-based annealers and quantum processors has shown potential in solving certain families of complex combinatorial optimization problems more efficiently than conventional CPUs. We show tha...
Resonantly driven CNOT gate for electron spins
D. M. Zajac, A. Sigillito, M. Russ +5 more·Aug 11, 2017
Building an essential quantum component To build a universal quantum computer—the kind that can handle any computational task you throw at it—an essential early step is to demonstrate the so-called CNOT gate, which acts on two qubits. Zajac et al. bu...
An Introduction to Quantum Computing, Without the Physics
G. Nannicini·Aug 11, 2017
This paper is a gentle but rigorous introduction to quantum computing intended for discrete mathematicians. Starting from a small set of assumptions on the behavior of quantum computing devices, we analyze their main characteristics, stressing the di...
Enhancing the photon-extraction efficiency of site-controlled quantum dots by deterministically fabricated microlenses
A. Kaganskiy, S. Fischbach, A. Strittmatter +3 more·Aug 11, 2017
Abstract We report on the realization of scalable single-photon sources (SPSs) based on single site-controlled quantum dots (SCQDs) and deterministically fabricated microlenses. The fabrication process comprises the buried-stressor growth technique c...
Experimental demonstration of perturbative anticrossing mitigation using nonuniform driver Hamiltonians
T. Lanting, A. King, B. Evert +1 more·Aug 10, 2017
Perturbative anticrossings have long been identified as a potential computational bottleneck for quantum annealing. This bottleneck can appear, for example, when a uniform transverse driver Hamiltonian is applied to each qubit. Previous theoretical r...
Coherence properties of the 0-π qubit
Peter Groszkowski, A. Paolo, A. Grimsmo +5 more·Aug 9, 2017
Superconducting circuits rank among some of the most interesting architectures for the implementation of quantum information processing devices. The recently proposed 0-π qubit (Brooks et al 2013 Phys. Rev. A 87 52306) promises increased protection f...
Superconducting Through-Silicon Vias for Quantum Integrated Circuits
M. Vahidpour, W. O'Brien, J. Whyland +12 more·Aug 7, 2017
We describe a microfabrication process for superconducting through-silicon vias appropriate for use in superconducting qubit quantum processors. With a sloped-wall via geometry, we can use non-conformal metal deposition methods such as electron-beam ...
Automated error correction in IBM quantum computer and explicit generalization
D. Ghosh, Pratik Agarwal, P. Pandey +2 more·Aug 7, 2017
Construction of a fault-tolerant quantum computer remains a challenging problem due to unavoidable noise and fragile quantum states. However, this goal can be achieved by introducing quantum error-correcting codes. Here, we experimentally realize an ...
Flag fault-tolerant error correction with arbitrary distance codes
C. Chamberland, M. Beverland·Aug 7, 2017
Fault-tolerant error correction (EC) is desirable for performing large quantum computations. In this disclosure, example fault-tolerant EC protocols are disclosed that use flag circuits, which signal when errors resulting from υ faults have weight gr...
Fourier analysis of sampling from noisy chaotic quantum circuits
S. Boixo, V. Smelyanskiy, H. Neven·Aug 6, 2017
Sampling from the output distribution of chaotic quantum evolutions, and of pseudo-random universal quantum circuits in particular, has been proposed as a prominent milestone for near-term quantum supremacy. The same paper notes that chaotic distribu...
Magnetic field dependent dynamics and field-driven metal-to-insulator transition of the half-filled Hubbard model: A DMFT+DMRG study
W. Zhu, D. Sheng, Jian-Xin Zhu·Aug 4, 2017
We study the magnetic field driven metal-to-insulator transition in half-filled Hubbard model on the Bethe lattice, using the dynamical mean-field theory by solving the quantum impurity problem with density-matrix renormalization group algorithm. The...
Traffic Flow Optimization Using a Quantum Annealer
F. Neukart, G. Compostella, Christian Seidel +3 more·Aug 4, 2017
Quantum annealing algorithms belong to the class of meta-heuristic tools, applicable for solving binary optimization problems. Hardware implementations of quantum annealing, such as the quantum processing units (QPUs) produced by D-Wave Systems, have...
Quantum Metrology beyond the Classical Limit under the Effect of Dephasing.
Y. Matsuzaki, S. Benjamin, S. Nakayama +2 more·Aug 4, 2017
Quantum sensors have the potential to outperform their classical counterparts. For classical sensing, the uncertainty of the estimation of the target fields scales inversely with the square root of the measurement time T. On the other hand, by using ...
Stabilizer codes from modified symplectic form
Tejas Gandhi, Piyush P. Kurur, R. Mittal·Aug 2, 2017
Stabilizer codes form an important class of quantum error correcting codes which have an elegant theory, efficient error detection, and many known examples. Constructing stabilizer codes of length $n$ is equivalent to constructing subspaces of $\math...
The upside of noise: engineered dissipation as a resource in superconducting circuits
E. Kapit·Aug 2, 2017
Historically, noise in superconducting circuits has been considered an obstacle to be removed. A large fraction of the research effort in designing superconducting circuits has focused on noise reduction, with great success, as coherence times have i...
Two-step approach to scheduling quantum circuits
G. Guerreschi, Jongsoo Park·Jul 31, 2017
As the effort to scale up existing quantum hardware proceeds, it becomes necessary to schedule quantum gates in a way that minimizes the number of operations. There are three constraints that have to be satisfied: the order or dependency of the quant...
Performance of five-qubit code for arbitrary error channels
Long Huang, Xiaohua Wu, T. Zhou·Jul 31, 2017
In quantum error correction, it is an important assumption that errors on different qubits are independent. In our previous work [Phys. Rev. A {\bf 92}, 052320 (2015)], the generality of the concatenated five-qubit code has been investgated when nois...