Charge-insensitive qubit design derived from the Cooper pair box
- J. Koch, Terri M. Yu, R. Schoelkopf
- Physics
- 28 February 2007
Short dephasing times pose one of the main challenges in realizing a quantum computer. Different approaches have been devised to cure this problem for superconducting qubits, a prime example being…
Hardware-efficient variational quantum eigensolver for small molecules and quantum magnets
- A. Kandala, A. Mezzacapo, J. Gambetta
- PhysicsNature
- 17 April 2017
The experimental optimization of Hamiltonian problems with up to six qubits and more than one hundred Pauli terms is demonstrated, determining the ground-state energy for molecules of increasing size, up to BeH2.
Supervised learning with quantum-enhanced feature spaces
- Vojtěch Havlíček, A. Córcoles, J. Gambetta
- Computer Science, PhysicsNature
- 30 April 2018
Two classification algorithms that use the quantum state space to produce feature maps are demonstrated on a superconducting processor, enabling the solution of problems when the feature space is large and the kernel functions are computationally expensive to estimate.
Open Quantum Assembly Language
- A. Cross, L. Bishop, J. Smolin, J. Gambetta
- Computer Science
- 11 July 2017
OpenQASM represents universal physical circuits over the CNOT plus SU(2) basis with straight-line code that includes measurement, reset, fast feedback, and gate subroutines that is used to implement experiments with low depth quantum circuits.
Validating quantum computers using randomized model circuits
- A. Cross, L. Bishop, S. Sheldon, P. Nation, J. Gambetta
- Computer SciencePhysical Review A
- 1 December 2018
A single-number metric, quantum volume, that can be measured using a concrete protocol on near-term quantum computers of modest size, and measured on several state-of-the-art transmon devices, finding values as high as 16.5%.
Error Mitigation for Short-Depth Quantum Circuits.
- K. Temme, S. Bravyi, J. Gambetta
- PhysicsPhysical Review Letters
- 6 December 2016
Two schemes are presented that mitigate the effect of errors and decoherence in short-depth quantum circuits by resampling randomized circuits according to a quasiprobability distribution.
Scalable and robust randomized benchmarking of quantum processes.
- E. Magesan, J. Gambetta, J. Emerson
- MathematicsPhysical Review Letters
- 19 September 2010
It is proved that the protocol provides an efficient and reliable estimate of the average error-rate for a set operations (gates) under a very general noise model that allows for both time and gate-dependent errors.
Characterization of addressability by simultaneous randomized benchmarking.
- J. Gambetta, A. Córcoles, M. Steffen
- PhysicsPhysical Review Letters
- 27 April 2012
A benchmarking protocol is introduced that provides information about the amount of addressability present in the system and is implemented on coupled superconducting qubits to agree with predictions based on simple models of the classical cross talk and Stark shifts.
Characterizing Quantum Gates via Randomized Benchmarking
- E. Magesan, J. Gambetta, J. Emerson
- Computer Science
- 30 September 2011
This work describes and expands upon the scalable randomized benchmarking protocol proposed in Phys.
Quantum information processing with circuit quantum electrodynamics
- A. Blais, J. Gambetta, R. Schoelkopf
- Physics
- 1 December 2006
We theoretically study single and two-qubit dynamics in the circuit QED architecture. We focus on the current experimental design [Wallraff et al., Nature (London) 431, 162 (2004); Schuster et al.,…
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