Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Quantum Machine Learning Matrix Product States
J. Biamonte·Apr 6, 2018
Matrix product states minimize bipartite correlations to compress the classical data representing quantum states. Matrix product state algorithms and similar tools---called tensor network methods---form the backbone of modern numerical methods used t...
Controllable two-photon interference with versatile quantum frequency processor
Hsuan-Hao Lu, J. Lukens, N. Peters +3 more·Mar 28, 2018
Quantum information is the next frontier in information science, promising unconditionally secure communications, enhanced channel capacities, and computing capabilities far beyond their classical counterparts. And as quantum information processing d...
Tunable Coupling Scheme for Implementing High-Fidelity Two-Qubit Gates
F. Yan, P. Krantz, Youngkyu Sung +6 more·Mar 26, 2018
The prospect of computational hardware with quantum advantage relies critically on the quality of quantum gate operations. Imperfect two-qubit gates is a major bottleneck for achieving scalable quantum information processors. Here, we propose a gener...
Joint Quantum-State and Measurement Tomography with Incomplete Measurements.
Adam C. Keith, Adam C. Keith, C. Baldwin +3 more·Mar 22, 2018
Estimation of quantum states and measurements is crucial for the implementation of quantum information protocols. The standard method for each is quantum tomography. However, quantum tomography suffers from systematic errors caused by imperfect knowl...
Synthesis of Logical Clifford Operators via Symplectic Geometry
Narayanan Rengaswamy, R. Calderbank, H. Pfister +1 more·Mar 19, 2018
Quantum error-correcting codes can be used to protect qubits involved in quantum computation. This requires that logical operators acting on protected qubits be translated to physical operators (circuits) acting on physical quantum states. We propose...
Designing quantum router in IBM quantum computer
B. K. Behera, Tasnum Reza, Angad Gupta +1 more·Mar 17, 2018
Quantum router is an essential ingredient in a quantum network. Here, we propose a new quantum circuit for designing quantum router by using IBM’s five-qubit quantum computer. We design an equivalent quantum circuit, by means of single-qubit and two-...
Approximate quantum Fourier transform with O(n log(n)) T gates
Y. Nam, Yuan Su, D. Maslov·Mar 13, 2018
The ability to implement the Quantum Fourier Transform (QFT) efficiently on a quantum computer facilitates the advantages offered by a variety of fundamental quantum algorithms, such as those for integer factoring, computing discrete logarithm over A...
Construction of controlled-NOT gate based on microwave-activated phase (MAP) gate in two transmon system
T. Noh, Gwanyeol Park, Soon-Gul Lee +2 more·Mar 12, 2018
We experimentally constructed an all-microwave scheme for the controlled-NOT (cNOT) gate between two superconducting transmon qubits in a three dimensional cavity. Our cNOT gate is based on the microwave-activated phase (MAP) gate, which requires an ...
Quantum Coherence Measures for Quantum Switch
Marek Sawerwain, J. Wiśniewska·Mar 8, 2018
We suppose that a structure working as a quantum switch will be a significant element of future networks realizing transmissions of quantum information. In this chapter we analyze a process of switch's operating -- especially in systems with a noise ...
Improving performance of an analog electronic device using quantum error correction
Corey I. Ostrove, B. Cour, Andrew Lanham +1 more·Mar 8, 2018
The use of analog classical systems for computation is generally thought to be a difficult proposition due to the susceptibility of these devices to noise and the lack of a clear framework for achieving fault-tolerance. We present experimental result...
Suppression of Qubit Crosstalk in a Tunable Coupling Superconducting Circuit
Pranav S. Mundada, Gengyan Zhang, T. Hazard +1 more·Mar 7, 2018
Parasitic crosstalk in superconducting quantum devices is a leading limitation for quantum gates. We demonstrate the suppression of static ZZ crosstalk in a two-qubit, two-coupler superconducting circuit, where the frequency of a tunable coupler can ...
Entangling power of holonomic gates in atom-based systems
Vahid Azimi Mousolou, E. Sjöqvist·Mar 1, 2018
Entanglement is one of the main resources of quantum computation, and entangling power of a quantum system is a crucial element in the universality and efficiency of a proposed architecture for realization of quantum processing. Our goal here is to s...
Tuneable hopping and nonlinear cross-Kerr interactions in a high-coherence superconducting circuit
M. Kounalakis, C. Dickel, A. Bruno +3 more·Feb 27, 2018
Analog quantum simulations offer rich opportunities for exploring complex quantum systems and phenomena through the use of specially engineered, well-controlled quantum systems. A critical element, increasing the scope and flexibility of such experim...
Qubit parity measurement by parametric driving in circuit QED
B. Royer, S. Puri, A. Blais·Feb 27, 2018
Large-scale quantum error correction is now more practical owing to novel method for qubit parity readout. Multiqubit parity measurements are essential to quantum error correction. Current realizations of these measurements often rely on ancilla qubi...
QuEST and High Performance Simulation of Quantum Computers
Tyson Jones, Anna Brown, I. Bush +1 more·Feb 22, 2018
We introduce QuEST, the Quantum Exact Simulation Toolkit, and compare it to ProjectQ, qHipster and a recent distributed implementation of Quantum++. QuEST is the first open source, hybrid multithreaded and distributed, GPU accelerated simulator of un...
Error correction for gate operations in systems of exchange-coupled singlet-triplet qubits in double quantum dots
Donovan Buterakos, R. Throckmorton, S. Das Sarma·Feb 22, 2018
We present a scheme for correcting for crosstalk- and noise-induced errors in exchange-coupled singlet-triplet semiconductor double quantum dot qubits. While exchange coupling allows the coupling strength to be controlled independently of the intraqu...
Quantum Divide-and-Conquer Anchoring for Separable Non-negative Matrix Factorization
Yuxuan Du, Tongliang Liu, Yinan Li +2 more·Feb 20, 2018
It is NP-complete to find non-negative factors W and H with fixed rank r from a non-negative matrix X by minimizing ||X-WH^Τ ||^2. Although the separability assumption (all data points are in the conical hull of the extreme rows) enables polynomial-t...
Quantum Circuit Design for Training Perceptron Models
Yu Zheng, Sicong Lu, R. Wu·Feb 15, 2018
Perceptron model is a fundamental linear classifier in machine learning and also the building block of artificial neural networks. Recently, Wiebe {\it et al} (arXiv:1602.04799) proposed that the training of a perceptron can be quadratically speeded ...
Wafer-Scale Fabrication and Room-Temperature Experiments on Graphene-Based Gates for Quantum Computation
M. Dragoman, A. Dinescu, D. Dragoman·Feb 15, 2018
We have fabricated at wafer-scale graphene-based configurations suitable for implementing at room temperature one-qubit quantum gates and a modified Deutsch–Jozsa algorithm. Our measurements confirmed the (quasi-)ballistic nature of charge carrier pr...
Realization of efficient quantum gates with a superconducting qubit-qutrit circuit
T. Bækkegaard, L. B. Kristensen, N. Loft +3 more·Feb 12, 2018
Building a quantum computer is a daunting challenge since it requires good control but also good isolation from the environment to minimize decoherence. It is therefore important to realize quantum gates efficiently, using as few operations as possib...