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The goal of this article is to review the progress of three-electron spin qubits from their
inception to the state of the art. We direct the main focus towards the exchange-only qubit …

Spin-orbit coupling is relatively weak for electrons in bulk silicon, but enhanced interactions
are reported in nanostructures such as the quantum dots used for spin qubits. These …

We study the motion of a pair of electrons along two separate parallel chains of quantum
dots. The electrons that are released from the central dot of each chain tend to accompany …

Recent achievements in the field of gate-defined semiconductor quantum dots reinforce the
concept of a spin-based quantum computer consisting of nodes of locally connected qubits …

We describe and analyze leakage errors of singlet-triplet qubits. Even though leakage errors
are a natural problem for spin qubits encoded using quantum dot arrays, they have obtained …

Capacitively coupled semiconductor spin qubits hold promise as the building blocks of a
scalable quantum computing architecture with long-range coupling between distant qubits …

We report the simultaneous operation and two-qubit-coupling measurement of a pair of two-
electron spin qubits, actively decoupled from quasi-static nuclear noise in a GaAs quadruple …

We present a donor-based quadruple-quantum-dot device, designed to host two singlet–
triplet qubits fabricated by scanning tunnelling microscope lithography, with just two leads …

The search for a sweet spot, the locus in qubit parameters where quantum control is first-
order insensitive to noises, is key to achieve high-fidelity quantum gates. Efforts to search for …