Simultaneous Operations in a Two-Dimensional Array of Singlet-Triplet Qubits

Federico Fedele, Anasua Chatterjee, Saeed Fallahi, Geoffrey C. Gardner, Michael J. Manfra, Ferdinand Kuemmeth*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

28 Citations (Scopus)
74 Downloads (Pure)

Abstract

In many physical approaches to quantum computation, error-correction schemes assume the ability to form two-dimensional qubit arrays with nearest-neighbor couplings and parallel operations at multiple qubit sites. While semiconductor spin qubits exhibit long coherence times relative to their operation speed and single-qubit fidelities above error correction thresholds, multiqubit operations in two-dimensional arrays have been limited by fabrication, operation, and readout challenges. We present a two-by-two array of four singlet-triplet qubits in gallium arsenide and show simultaneous coherent operations and four-qubit measurements via exchange oscillations and frequency-multiplexed single-shot measurements. A larger multielectron quantum dot is fabricated in the center of the array as a tunable interqubit link, which we utilize to demonstrate coherent spin exchange with selected qubits. Our techniques are extensible to other materials, indicating a path towards quantum processors with gate-controlled spin qubits.

Original languageEnglish
Article number040306
JournalPRX Quantum
Volume2
Issue number4
Number of pages12
ISSN2691-3399
DOIs
Publication statusPublished - 8 Oct 2021

Keywords

  • QUANTUM
  • GATE

Cite this