Scalable quantum computer with superconducting circuits in the ultrastrong coupling regime

So far, superconducting quantum computers have certain constraints on qubit connectivity, such as nearest-neighbor couplings. To overcome this limitation, we propose a scalable architecture to simultaneously connect several pairs of distant qubits via a dispersively coupled quantum bus. The building...

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Bibliographic Details
Published in:npj quantum information 2020-08, Vol.6 (1), Article 67
Main Authors: Stassi, Roberto, Cirio, Mauro, Nori, Franco
Format: Article
Language:English
Subjects:
639/766/1130/1064
639/766/483/2802
639/766/483/481
Classical and Quantum Gravitation
Computers
Nearest-neighbor
Physics
Physics and Astronomy
Quantum Computing
Quantum Field Theories
Quantum Information Technology
Quantum Physics
Relativity Theory
Spintronics
String Theory
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Summary:So far, superconducting quantum computers have certain constraints on qubit connectivity, such as nearest-neighbor couplings. To overcome this limitation, we propose a scalable architecture to simultaneously connect several pairs of distant qubits via a dispersively coupled quantum bus. The building block of the bus is composed of orthogonal coplanar waveguide resonators connected through ancillary flux qubits working in the ultrastrong coupling regime. This regime activates virtual processes that boost the effective qubit–qubit interaction, which results in quantum gates on the nanosecond timescale. The interaction is switchable and preserves the coherence of the qubits.
ISSN:2056-6387
2056-6387
DOI:10.1038/s41534-020-00294-x