Demonstration of a Tuneable Coupler for Superconducting Qubits Using Coherent, Time Domain, Two-Qubit Operations

A major challenge in the field of quantum computing is the construction of scalable qubit coupling architectures. Here, we demonstrate a novel tuneable coupling circuit that allows superconducting qubits to be coupled over long distances. We show that the inter-qubit coupling strength can be arbitra...

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Bibliographic Details
Published in:arXiv.org 2010-07
Main Authors: Bialczak, R C, Ansmann, M, Hofheinz, M, Lenander, M, Lucero, E, Neeley, M, O'Connell, A D, Sank, D, Wang, H, Weides, M, Wenner, J, Yamamoto, T, Cleland, A N, Martinis, J M
Format: Article
Language:English
Subjects:
Algorithms
Circuits
Couplers
Coupling
Coupling circuits
Quantum computers
Quantum computing
Quantum theory
Qubits (quantum computing)
Superconductivity
Online Access:Get full text
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Summary:A major challenge in the field of quantum computing is the construction of scalable qubit coupling architectures. Here, we demonstrate a novel tuneable coupling circuit that allows superconducting qubits to be coupled over long distances. We show that the inter-qubit coupling strength can be arbitrarily tuned over nanosecond timescales within a sequence that mimics actual use in an algorithm. The coupler has a measured on/off ratio of 1000. The design is self-contained and physically separate from the qubits, allowing the coupler to be used as a module to connect a variety of elements such as qubits, resonators, amplifiers, and readout circuitry over long distances. Such design flexibility is likely to be essential for a scalable quantum computer.
ISSN:2331-8422
DOI:10.48550/arxiv.1007.2219