Device Architecture for Coupling Spin Qubits Via an Intermediate Quantum State

Abstract

We demonstrate a scalable device architecture that facilitates indirect exchange between singlet-triplet spin qubits, mediated by an intermediate quantum state. The device comprises five quantum dots, which can be independently loaded and unloaded via tunneling to adjacent reservoirs, avoiding charge latch-up common in linear dot arrays. In a step towards realizing two-qubit entanglement based on indirect exchange, the architecture permits precise control over tunnel rates between the singlet-triplet qubits and the intermediate state. We show that by separating qubits by 1 um, the residual capacitive coupling between them is reduced to 7 ueV.

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Cited by in corpus (11)

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• Microwaves in Quantum Computing
• Fast spin exchange between two distant quantum dots
• Autonomous tuning and charge state detection of gate defined quantum dots
• Exchange coupling in a linear chain of three quantum-dot spin qubits in silicon
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• Jellybean quantum dots in silicon for qubit coupling and on-chip quantum chemistry
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• Resonator-mediated quantum gate between distant charge qubits
• Universal control of superexchange in linear triple quantum dots with an empty mediator