Coherent transfer of quantum information in a silicon double quantum dot using resonant SWAP gates

A. J. Sigillito, M. J. Gullans, L. F. Edge, M. Borselli, J. R. Petta

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

Spin-based quantum processors in silicon quantum dots offer high-fidelity single and two-qubit operation. Recently multi-qubit devices have been realized; however, many-qubit demonstrations remain elusive, partly due to the limited qubit-to-qubit connectivity. These problems can be overcome by using SWAP gates, which are challenging to implement in devices having large magnetic field gradients. Here we use a primitive SWAP gate to transfer spin eigenstates in 100 ns with a fidelity of F¯SWAP(p)=98%. By swapping eigenstates we are able to demonstrate a technique for reading out and initializing the state of a double quantum dot without shuttling charges through the quantum dot. We then show that the SWAP gate can transfer arbitrary two-qubit product states in 300 ns with a fidelity of F¯SWAP(c)=84%. This work sets the stage for many-qubit experiments in silicon quantum dots.

Original languageEnglish (US)
Article number110
Journalnpj Quantum Information
Volume5
Issue number1
DOIs
StatePublished - Dec 1 2019

All Science Journal Classification (ASJC) codes

  • Computer Science (miscellaneous)
  • Statistical and Nonlinear Physics
  • Computer Networks and Communications
  • Computational Theory and Mathematics

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