Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Complete characterization of the directly implementable quantum gates used in the IBM quantum processors
A. Shukla, M. Sisodia, A. Pathak·May 18, 2018
Quantum process tomography of each directly implementable quantum gate used in the IBM quantum processors is performed to compute gate error in order to check viability of complex quantum operations in the superconductivity-based quantum computers in...
Towards Large-scale Functional Verification of Universal Quantum Circuits
M. Amy·May 17, 2018
We introduce a framework for the formal specification and verification of quantum circuits based on the Feynman path integral. Our formalism, built around exponential sums of polynomial functions, provides a structured and natural way of specifying q...
How many qubits are needed for quantum computational supremacy?
A. Dalzell, A. Harrow, Dax Enshan Koh +1 more·May 14, 2018
Quantum computational supremacy arguments, which describe a way for a quantum computer to perform a task that cannot also be done by a classical computer, typically require some sort of computational assumption related to the limitations of classical...
Fidelity benchmarks for two-qubit gates in silicon
W. Huang, C. Yang, K. Chan +11 more·May 14, 2018
Universal quantum computation will require qubit technology based on a scalable platform1, together with quantum error correction protocols that place strict limits on the maximum infidelities for one- and two-qubit gate operations2,3. Although vario...
Tunable charge qubit based on barrier-controlled triple quantum dots
Xu-Chen Yang, G. Chan, Xin Wang·May 11, 2018
We present a theoretical proposal of a tunable charge qubit, hosted in triple quantum dots. The manipulation is solely performed by changing the heights of the two potential barriers between the three dots, while the energy of all three dots are fixe...
Quantum algorithms for electronic structure calculations: Particle-hole Hamiltonian and optimized wave-function expansions
P. Barkoutsos, J. Gonthier, I. Sokolov +9 more·May 11, 2018
In this work we investigate methods to improve the efficiency and scalability of quantum algorithms for quantum chemistry applications. We propose a transformation of the electronic structure Hamiltonian in the second quantization framework into the ...
High-dimensional optical quantum logic in large operational spaces
Poolad Imany, J. Jaramillo-Villegas, Mohammed S. Alshaykh +6 more·May 11, 2018
The probabilistic nature of single-photon sources and photon–photon interactions encourages encoding as much quantum information as possible in every photon for the purpose of photonic quantum information processing. Here, by encoding high-dimensiona...
Performance Assessment of Resonantly Driven Silicon Two-Qubit Quantum Gate
Tong Wu, Jing Guo·May 10, 2018
Two-qubit quantum gates play an essential role in quantum computing, whose operation critically depends on the entanglement between two qubits. Resonantly driven controlled-NOT (CNOT) gates based on silicon double quantum dots (DQDs) are studied theo...
Quantum control for high-fidelity multi-qubit gates
R. Spiteri, M. Schmidt, J. Ghosh +2 more·May 9, 2018
Quantum control for error correction is critical for the practical use of quantum computers. We address quantum optimal control for single-shot multi-qubit gates by framing it as a feasibility problem for the Hamiltonian model that is then solved wit...
Encoding Electronic Spectra in Quantum Circuits with Linear T Complexity
R. Babbush, C. Gidney, D. Berry +5 more·May 9, 2018
We construct quantum circuits which exactly encode the spectra of correlated electron models up to errors from rotation synthesis. By invoking these circuits as oracles within the recently introduced "qubitization" framework, one can use quantum phas...
Quantum Circuits for Toom-Cook Multiplication
Srijit Dutta, Debjyoti Bhattacharjee, A. Chattopadhyay·May 7, 2018
In this paper, we report efficient quantum circuits for integer multiplication using Toom-Cook algorithm. By analysing the recursive tree structure of the algorithm, we obtained a bound on the count of Toffoli gates and qubits. These bounds are furth...
Implementing quantum algorithms on temporal photonic cluster states
D. Su, K. Sabapathy, C. Myers +3 more·May 7, 2018
Implementing quantum algorithms is essential for quantum computation. We study the implementation of three quantum algorithms by performing homodyne measurements on a two-dimensional temporal continuous-variable cluster state. We first review the gen...
Universal, high-fidelity quantum gates based on superadiabatic, geometric phases on a solid-state spin-qubit at room temperature
Felix Kleißler, A. Lazariev, Silvia Arroyo-Camejo·Apr 29, 2018
Geometric phases and holonomies are a promising resource for the realization of high-fidelity quantum operations in noisy devices, due to their intrinsic fault-tolerance against parametric noise. However, for a long time their practical use in quantu...
Quantum Computing Circuits and Devices
T. Humble, H. Thapliyal, Edgard Muñoz-Coreas +2 more·Apr 27, 2018
Editor’s note: As an emerging technology, quantum computing brings unique promises in creating a fundamentally different paradigm of information processing. This article reviews introductory concepts and building blocks—quantum logic gates and memory...
Explicit Lower Bounds on Strong Quantum Simulation
Cupjin Huang, M. Newman, M. Szegedy·Apr 27, 2018
We consider the problem of classical strong (amplitude-wise) simulation of <inline-formula> <tex-math notation="LaTeX">$n$ </tex-math></inline-formula>-qubit quantum circuits, and identify a subclass of simulators we call monotone. This subclass enco...
Repeated multi-qubit readout and feedback with a mixed-species trapped-ion register
V. Negnevitsky, M. Marinelli, Karan K. Mehta +3 more·Apr 25, 2018
Quantum error correction is essential for realizing the full potential of large-scale quantum information processing devices1,2. Fundamental to its experimental realization is the repetitive detection of errors via projective measurements of quantum ...
Single-Loop Realization of Arbitrary Nonadiabatic Holonomic Single-Qubit Quantum Gates in a Superconducting Circuit.
Yuan Xu, W. Cai, Y. Ma +8 more·Apr 20, 2018
Geometric phases are noise resilient, and thus provide a robust way towards high-fidelity quantum manipulation. Here we experimentally demonstrate arbitrary nonadiabatic holonomic single-qubit quantum gates for both a superconducting transmon qubit a...
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...
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...