Low-Error Operation of Spin Qubits with Superexchange Coupling

Abstract

In this theoretical work we investigate superexchange, as a means of indirect exchange interaction between two single electron spin qubits, each embedded in a single semiconductor quantum dot (QD). The exchange interaction is mediated by an intermediate, empty QD. Our findings suggest the existence of first order "super sweet spots", in which the qubit operations implemented by superexchange interaction are simultaneously insensitive to charge noise and errors due to spin-orbit interaction. We also find that the sign of the superexchange can be changed by varying the energy detunings between the QDs.

5 pages, 4 figures, supplementary Material after the references

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Cited by in corpus (8)

• A logical qubit in a linear array of semiconductor quantum dots
• High-fidelity geometric gate for silicon-based spin qubits
• Entangling Spins in Double Quantum Dots and Majorana Bound States
• Control of the Two-Electron Exchange Interaction in a Nanowire Double Quantum Dot
• Leakage and dephasing in ${}^{28}$Si-based exchange-only spin qubits
• Universal control of superexchange in linear triple quantum dots with an empty mediator
• Multi-qubit DC gates over an inhomogeneous array of quantum dots
• Universal singlet-triplet qubits implemented near the transverse sweet spot