The exchange-only singlet-only spin qubit

Abstract

We propose a feasible and scalable quantum-dot-based implementation of a singlet-only spin qubit which is to leading order intrinsically insensitive to random effective magnetic fields set up by fluctuating nuclear spins in the host semiconductor. Our proposal thus removes an important obstacle for further improvement of spin qubits hosted in high-quality III-V semiconductors such as GaAs. We show how the resulting qubit could be initialized, manipulated, and read out by electrical means only, in a way very similar to a triple-dot exchange-only spin qubit. Due to the intrinsic elimination of the effective nuclear fields from the qubit Hamiltonian, we find an improvement of the dephasing time $T_2^{\ast }$ of several orders of magnitude as compared to similar existing spin qubits.

arXiv comment5 pages, two figures plus supplementary material. The new version includes a few minor changes in the text and some new references

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• Semiconductor Spin Qubits
• Roadmap for gallium arsenide spin qubits
• Roadmap on quantum nanotechnologies
• Colloquium: Advances in automation of quantum dot devices control
• Quantum simulation of antiferromagnetic Heisenberg chain with gate-defined quantum dots
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• Exploring Entanglement Spectrum and Phase Diagram in multi-electron Quantum Dot Chains
• Qubit decoherence under two-axis coupling to low-frequency noises