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Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Dynamical protection of nonclassical correlation in a quantum algorithm
V. S. Anjusha, T. S. Mahesh·Feb 8, 2018
A quantum memory interacts with its environment and loses information via decoherence as well as incoherence. A robust quantum control that prepares, preserves, and manipulates nonclassical correlations even in the presence of environmental influence...
Quantum Approximate Optimization With Parallelizable Gates
W. Lechner·Feb 4, 2018
The quantum approximate optimization algorithm (QAOA) has been introduced as a heuristic digital quantum computing scheme to find approximate solutions of combinatorial optimization problems. We present a scheme to parallelize this approach for arbit...
A generalized circuit for the Hamiltonian dynamics through the truncated series
A. Daskin, S. Kais·Jan 29, 2018
In this paper, we present a method for Hamiltonian simulation in the context of eigenvalue estimation problems, which improves earlier results dealing with Hamiltonian simulation through the truncated Taylor series. In particular, we present a fixed-...
A generative modeling approach for benchmarking and training shallow quantum circuits
Marcello Benedetti, Delfina Garcia-Pintos, O. Perdomo +3 more·Jan 23, 2018
Hybrid quantum-classical algorithms provide ways to use noisy intermediate-scale quantum computers for practical applications. Expanding the portfolio of such techniques, we propose a quantum circuit learning algorithm that can be used to assist the ...
Transversality and lattice surgery: Exploring realistic routes toward coupled logical qubits with trapped-ion quantum processors
Mauricio Gutiérrez, Mauricio Gutiérrez, Markus Müller +3 more·Jan 22, 2018
Active quantum error correction has been identified as a crucial ingredient of future quantum computers, motivating the recent experimental efforts to encode logical quantum bits using small topological codes. In addition to the demonstration of the ...
Pair-cat codes: autonomous error-correction with low-order nonlinearity
Victor V. Albert, S. Mundhada, A. Grimm +3 more·Jan 18, 2018
We introduce a driven-dissipative two-mode bosonic system whose reservoir causes simultaneous loss of two photons in each mode and whose steady states are superpositions of pair-coherent/Barut-Girardello coherent states. We show how quantum informati...
Deterministic teleportation of a quantum gate between two logical qubits
K. Chou, J. Blumoff, J. Blumoff +8 more·Jan 16, 2018
A quantum computer has the potential to efficiently solve problems that are intractable for classical computers. However, constructing a large-scale quantum processor is challenging because of the errors and noise that are inherent in real-world quan...
Three-dimensional surface codes: Transversal gates and fault-tolerant architectures
M. Vasmer, D. Browne·Jan 13, 2018
One of the leading quantum computing architectures is based on the two-dimensional (2D) surface code. This code has many advantageous properties such as a high error threshold and a planar layout of physical qubits where each physical qubit need only...
Quantum Algorithm for Simulating Real Time Evolution of Lattice Hamiltonians
Jeongwan Haah, M. Hastings, Robin Kothari +1 more·Jan 11, 2018
We study the problem of simulating the time evolution of a lattice Hamiltonian, where the qubits are laid out on a lattice and the Hamiltonian only includes geometrically local interactions (i.e., a qubit may only interact with qubits in its vicinity...
Deterministic Generation of Large-Scale Entangled Photonic Cluster State from Interacting Solid State Emitters.
Mercedes Gimeno-Segovia, T. Rudolph, S. Economou·Jan 8, 2018
The ability to create large highly entangled "cluster" states is crucial for measurement-based quantum computing. We show that deterministic multiphoton entanglement can be created from coupled solid state quantum emitters without the need for any tw...
Low-depth circuit ansatz for preparing correlated fermionic states on a quantum computer
Pierre-Luc Dallaire-Demers, J. Romero, L. Veis +2 more·Jan 3, 2018
Quantum simulations are bound to be one of the main applications of near-term quantum computers. Quantum chemistry and condensed matter physics are expected to benefit from these technological developments. Several quantum simulation methods are know...
Quantum Computing in the NISQ era and beyond
J. Preskill·Jan 2, 2018
Noisy Intermediate-Scale Quantum (NISQ) technology will be available in the near future. Quantum computers with 50-100 qubits may be able to perform tasks which surpass the capabilities of today's classical digital computers, but noise in quantum gat...
Realization of t-bit semiclassical quantum Fourier transform on IBM’s quantum cloud computer
Xiang-Qun 向群 Fu 付, W. Bao 鲍, H. Huang 黄 +5 more·Dec 22, 2017
To overcome the difficulty of realizing large-scale quantum Fourier transform (QFT) within existing technology, this paper implements a resource-saving method (named t-bit semiclassical QFT over Z 2 n ), which could realize large-scale QFT using an a...
T-count and Qubit Optimized Quantum Circuit Design of the Non-Restoring Square Root Algorithm
Edgard Muñoz-Coreas, H. Thapliyal·Dec 21, 2017
Quantum circuits for basic mathematical functions such as the square root are required to implement scientific computing algorithms on quantum computers. Quantum circuits that are based on Clifford+T gates can easily be made fault tolerant, but the T...
Room Temperature High-fidelity Non-adiabatic Holonomic Quantum Computation on Solid-state Spins in Nitrogen-vacancy Centers
Guo-an Yan, Hua Lu·Dec 20, 2017
The high-speed implementation and robustness against of non-adiabatic holonomic quantum computation provide a new idea for overcoming the difficulty of the quantum system interacting with the environment easily decoherence, which realizing large-scal...
Deterministic Remote Entanglement of Superconducting Circuits through Microwave Two-Photon Transitions.
P. Campagne-Ibarcq, E. Zalys-Geller, A. Narla +8 more·Dec 15, 2017
Large-scale quantum information processing networks will most probably require the entanglement of distant systems that do not interact directly. This can be done by performing entangling gates between standing information carriers, used as memories ...
Simulation of low-depth quantum circuits as complex undirected graphical models
S. Boixo, S. Isakov, V. Smelyanskiy +1 more·Dec 14, 2017
Near term quantum computers with a high quantity (around 50) and quality (around 0.995 fidelity for two-qubit gates) of qubits will approximately sample from certain probability distributions beyond the capabilities of known classical algorithms on s...
An Efficient Methodology for Mapping Quantum Circuits to the IBM QX Architectures
Alwin Zulehner, A. Paler, R. Wille·Dec 13, 2017
In the past years, quantum computers more and more have evolved from an academic idea to an upcoming reality. IBM’s project IBM ${Q}$ can be seen as evidence of this progress. Launched in March 2017 with the goal to provide access to quantum computer...
Measuring and Suppressing Error Correlations in Quantum Circuits
C. Edmunds, Cornelius Hempel, R. Harris +4 more·Dec 13, 2017
Quantum error correction provides a path to large-scale quantum computers, but is built on challenging assumptions about the characteristics of the underlying errors. In particular, the mathematical assumption of independent errors in quantum logic o...
Machine learning techniques for state recognition and auto-tuning in quantum dots
Sandesh S. Kalantre, J. P. Zwolak, Stephen Ragole +4 more·Dec 13, 2017
Recent progress in building large-scale quantum devices for exploring quantum computing and simulation has relied upon effective tools for achieving and maintaining good experimental parameters, i.e., tuning up devices. In many cases, including quant...