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arXiv:2105.01392 · PRX Quantum

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

Published Oct 8, 2021• 42 citations
arXivHTMLPDF

Abstract

A two-dimensional array of four tunable double quantum dots, each representing one singlet-triplet qubit, is implemented that constitute a toolset for the simultaneous operation of multiple qubits on a chip.
DOI
10.1103/prxquantum.2.040306

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A pair of self-assembled InGaAs quantum dots filled with two electrons can act as a singlet-triplet spin qubit that is robust against nuclear spin fluctuations as well as charge noise. This results in a T2* coherence time two orders of magnitude longer than that of a single electron, provided the qubit is operated at a particular "sweet spot" in gate voltage. However, at this fixed operating point the ground-state splitting can no longer be tuned into resonance with e.g. another qubit, limiting the options for coupling multiple qubits. Here, we propose using a four-electron coupled quantum dot to implement a singlet-triplet qubit that features a magnetically tunable level splitting. As a first step towards full experimental realization of this qubit design, we use optical spectroscopy to demonstrate the tunability of the four-electron singlet-triplet splitting in a moderate magnetic field.