Quantum interference device for controlled two-qubit operations
Name
s41467-020-17033-7.pdf
Description
Published version
Size
4.09 MB
Format
Adobe PDF
Checksum (MD5)
22de3feafd2ab4869b3c3de526ce9dc4
Author(s)
Loft, Niels Jakob Søe
Kjaergaard, Morten
Kristensen, Lasse Bjørn
Andersen, Christian Kraglund
Larsen, Thorvald W
Gustavsson, Simon
Oliver, William D
Zinner, Nikolaj T
Date Issued
2020
Journal
npj Quantum Information
Publisher
Springer Science and Business Media LLC
Version
Final published version
Abstract
© 2020, The Author(s). Universal quantum computing relies on high-fidelity entangling operations. Here, we demonstrate that four coupled qubits can operate as a quantum gate, where two qubits control the operation on two target qubits (a four-qubit gate). This configuration can implement four different controlled two-qubit gates: two different entangling swap and phase operations, a phase operation distinguishing states of different parity, and the identity operation (idle quantum gate), where the choice of gate is set by the state of the control qubits. The device exploits quantum interference to control the operation on the target qubits by coupling them to each other via the control qubits. By connecting several four-qubit devices in a two-dimensional lattice, one can achieve a highly connected quantum computer. We consider an implementation of the four-qubit gate with superconducting qubits, using capacitively coupled qubits arranged in a diamond-shaped architecture.
MIT Department
Koch Institute for Integrative Cancer Research at MIT
Sloan School of Management
Massachusetts Institute of Technology. Operations Research Center
Terms of Use
Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1038/S41534-020-0275-3
