# A quantum engineer's guide to superconducting qubits

@article{Krantz2019AQE, title={A quantum engineer's guide to superconducting qubits}, author={Philip Krantz and Morten Kjaergaard and Fei Yan and T. P. Orlando and Simon Gustavsson and William D. Oliver}, journal={Applied Physics Reviews}, year={2019} }

The aim of this review is to provide quantum engineers with an introductory guide to the central concepts and challenges in the rapidly accelerating field of superconducting quantum circuits. Over the past twenty years, the field has matured from a predominantly basic research endeavor to one that increasingly explores the engineering of larger-scale superconducting quantum systems. Here, we review several foundational elements -- qubit design, noise properties, qubit control, and readout… Expand

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#### References

SHOWING 1-10 OF 398 REFERENCES

Quantum Coherent Tunable Coupling of Superconducting Qubits

- Physics, Medicine
- Science
- 2007

This work reports on the time-domain tunable coupling of optimally biased superconducting flux qubits by modulating the nonlinear inductance of an additional coupling element and parametrically induced a two-qubit transition that was otherwise forbidden. Expand

Voltage-controlled superconducting quantum bus

- Physics
- Physical Review B
- 2019

We demonstrate the ability of an epitaxial semiconductor-superconductor nanowire to serve as a field-effect switch to tune a superconducting cavity. Two superconducting gatemon qubits are coupled to… Expand

Cavity quantum electrodynamics for superconducting electrical circuits: An architecture for quantum computation

- Physics
- 2004

We propose a realizable architecture using one-dimensional transmission line resonators to reach the strong-coupling limit of cavity quantum electrodynamics in superconducting electrical circuits.… Expand

Building logical qubits in a superconducting quantum computing system

- Computer Science, Physics
- 2015

This work describes the important route towards a logical memory with superconducting qubits, employing a rotated version of the surface code, laying the foundation towards scalable fault-tolerant quantum computers in the near future. Expand

Superconducting persistent-current qubit

- Physics
- 1999

We present the design of a superconducting qubit that has circulating currents of opposite sign as its two states. The circuit consists of three nanoscale aluminum Josephson junctions connected in a… Expand

Digital quantum simulation of fermionic models with a superconducting circuit

- Physics, Medicine
- Nature communications
- 2015

Digital methods are used to construct the required arbitrary interactions, and perform quantum simulation of up to four fermionic modes with a superconducting quantum circuit, and reach fidelities that are consistent with a simple model of uncorrelated errors. Expand

High-fidelity quantum operations on superconducting qubits in the presence of noise.

- Physics, Medicine
- Physical review letters
- 2008

A Monte Carlo simulation technique capable of describing arbitrary noise-induced dephasing and decay is developed, and a set of universal gate operations with O(10(-5)) error probabilities in the presence of experimentally measured levels of 1/f noise is demonstrated. Expand

Superconducting quantum bits

- Physics, Medicine
- Nature
- 2008

Superconducting circuits are macroscopic in size but have generic quantum properties such as quantized energy levels, superposition of states, and entanglement, all of which are more commonly… Expand

10-Qubit Entanglement and Parallel Logic Operations with a Superconducting Circuit.

- Physics, Medicine
- Physical review letters
- 2017

The production and tomography of genuinely entangled Greenberger-Horne-Zeilinger states with up to ten qubits connecting to a bus resonator in a superconducting circuit are reported, demonstrating the largest entanglement created so far in solid-state architectures and paving the way to large-scale quantum computation. Expand

Quantum bits with Josephson junctions (Review Article)

- Physics
- 2007

Recent demonstrations of macroscopic quantum coherence in Josephson junction based electronic circuits have opened an entirely new dimension for research and applications in the established field of… Expand