Quantum supremacy using a programmable superconducting processor

F Arute, K Arya, R Babbush, D Bacon, JC Bardin… - Nature, 2019 - nature.com
The promise of quantum computers is that certain computational tasks might be executed
exponentially faster on a quantum processor than on a classical processor 1. A fundamental …

Superconducting quantum circuits at the surface code threshold for fault tolerance

R Barends, J Kelly, A Megrant, A Veitia, D Sank… - Nature, 2014 - nature.com
A quantum computer can solve hard problems, such as prime factoring,, database
searching, and quantum simulation, at the cost of needing to protect fragile quantum states …

Scalable quantum simulation of molecular energies

PJJ O'Malley, R Babbush, ID Kivlichan, J Romero… - Physical Review X, 2016 - APS
We report the first electronic structure calculation performed on a quantum computer without
exponentially costly precompilation. We use a programmable array of superconducting …

State preservation by repetitive error detection in a superconducting quantum circuit

J Kelly, R Barends, AG Fowler, A Megrant, E Jeffrey… - Nature, 2015 - nature.com
Quantum computing becomes viable when a quantum state can be protected from
environment-induced error. If quantum bits (qubits) are sufficiently reliable, errors are sparse …

Coherent Josephson qubit suitable for scalable quantum integrated circuits

R Barends, J Kelly, A Megrant, D Sank, E Jeffrey… - Physical review …, 2013 - APS
We demonstrate a planar, tunable superconducting qubit with energy relaxation times up to
44 μ s. This is achieved by using a geometry designed to both minimize radiative loss and …

Quantum approximate optimization of non-planar graph problems on a planar superconducting processor

MP Harrigan, KJ Sung, M Neeley, KJ Satzinger… - Nature Physics, 2021 - nature.com
Faster algorithms for combinatorial optimization could prove transformative for diverse areas
such as logistics, finance and machine learning. Accordingly, the possibility of quantum …

Digitized adiabatic quantum computing with a superconducting circuit

R Barends, A Shabani, L Lamata, J Kelly, A Mezzacapo… - Nature, 2016 - nature.com
Quantum mechanics can help to solve complex problems in physics and chemistry, provided
they can be programmed in a physical device. In adiabatic quantum computing,,, a system is …

Planar superconducting resonators with internal quality factors above one million

A Megrant, C Neill, R Barends, B Chiaro… - Applied Physics …, 2012 - pubs.aip.org
We describe the fabrication and measurement of microwave coplanar waveguide resonators
with internal quality factors above 10 7 at high microwave powers and over 10 6 at low …

Chiral ground-state currents of interacting photons in a synthetic magnetic field

P Roushan, C Neill, A Megrant, Y Chen, R Babbush… - Nature Physics, 2017 - nature.com
The intriguing many-body phases of quantum matter arise from the interplay of particle
interactions, spatial symmetries, and external fields. Generating these phases in an …

Demonstrating a continuous set of two-qubit gates for near-term quantum algorithms

B Foxen, C Neill, A Dunsworth, P Roushan, B Chiaro… - Physical Review Letters, 2020 - APS
Quantum algorithms offer a dramatic speedup for computational problems in material
science and chemistry. However, any near-term realizations of these algorithms will need to …