Quantum supremacy using a programmable superconducting processor
- F. Arute, K. Arya, J. Martinis
- Physics, Computer ScienceNature
- 23 October 2019
Quantum supremacy is demonstrated using a programmable superconducting processor known as Sycamore, taking approximately 200 seconds to sample one instance of a quantum circuit a million times, which would take a state-of-the-art supercomputer around ten thousand years to compute.
Scalable Quantum Simulation of Molecular Energies
- P. O’Malley, R. Babbush, J. Martinis
- Physics
- 21 December 2015
We report the first electronic structure calculation performed on a quantum computer without exponentially costly precompilation. We use a programmable array of superconducting qubits to compute the…
Quantum approximate optimization of non-planar graph problems on a planar superconducting processor
Here the authors implement a quantum optimization algorithm over 23 qubits but find more limited performance when an optimization problem structure does not match the underlying hardware.
Superconducting quantum circuits at the surface code threshold for fault tolerance
- R. Barends, J. Kelly, J. Martinis
- Physics, Computer ScienceNature
- 23 April 2014
The results demonstrate that Josephson quantum computing is a high-fidelity technology, with a clear path to scaling up to large-scale, fault-tolerant quantum circuits.
State preservation by repetitive error detection in a superconducting quantum circuit
- J. Kelly, R. Barends, J. Martinis
- PhysicsNature
- 26 November 2014
The protection of classical states from environmental bit-flip errors is reported and the suppression of these errors with increasing system size is demonstrated, motivating further research into the many challenges associated with building a large-scale superconducting quantum computer.
Hartree-Fock on a superconducting qubit quantum computer
- F. Arute, K. Arya, Adam Zalcman
- PhysicsScience
- 8 April 2020
Several quantum simulations of chemistry with up to one dozen qubits are performed, including modeling the isomerization mechanism of diazene, and error-mitigation strategies based on N-representability that dramatically improve the effective fidelity of the experiments are demonstrated.
A blueprint for demonstrating quantum supremacy with superconducting qubits
- C. Neill, P. Roushan, J. Martinis
- PhysicsScience
- 19 September 2017
Nine superconducting qubits are used to demonstrate a promising path toward quantum supremacy and the scaling of errors and output with the number of qubits is explored in a five- to nine-qubit device.
Coherent Josephson qubit suitable for scalable quantum integrated circuits.
- R. Barends, J. Kelly, J. Martinis
- PhysicsPhysical Review Letters
- 8 April 2013
This work demonstrates a planar, tunable superconducting qubit with energy relaxation times up to 44 μs and finds a fine structure in the qubit energy lifetime as a function of frequency, indicating the presence of a sparse population of incoherent, weakly coupled two-level defects.
Digitized adiabatic quantum computing with a superconducting circuit
- R. Barends, A. Shabani, J. Martinis
- Physics, Computer ScienceNature
- 10 November 2015
This work combines the advantages of adiabiatic and universal quantum computers by implementing digitized adiabatic quantum computing in a superconducting system and becomes a general-purpose algorithm that is scalable.
Planar Superconducting Resonators with Internal Quality Factors above One Million
- A. Megrant, C. Neill, A. Cleland
- Physics
- 16 January 2012
We describe the fabrication and measurement of microwave coplanar waveguide resonators with internal quality factors above 10 million at high microwave powers and over 1 million at low powers, with…
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