Exchange control in a MOS double quantum dot made using a 300 mm wafer process

• URL: http://arxiv.org/abs/2408.01241v2
• Date: Sat, 10 Aug 2024 18:02:11 GMT
• Title: Exchange control in a MOS double quantum dot made using a 300 mm wafer process
• Authors: Jacob F. Chittock-Wood, Ross C. C. Leon, Michael A. Fogarty, Tara Murphy, Sofia M. Patomäki, Giovanni A. Oakes, Felix-Ekkehard von Horstig, Nathan Johnson, Julien Jussot, Stefan Kubicek, Bogdan Govoreanu, David F. Wise, M. Fernando Gonzalez-Zalba, John J. L. Morton,
• Abstract summary: Recent studies of quantum dots fabricated on 300 mm wafer metal-oxide-semiconductor (MOS) processes have shown control and readout of individual spin qubits. We demonstrate coherent control of two electron spins using the spin-spin exchange interaction, forming the basis of an entangling gate. Our results demonstrate an industrial grade platform for two-qubit operations, alongside integration with dispersive sensing techniques.
• Score: 0.6212050938816976
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Leveraging the advanced manufacturing capabilities of the semiconductor industry promises to help scale up silicon-based quantum processors by increasing yield, uniformity and integration. Recent studies of quantum dots fabricated on 300 mm wafer metal-oxide-semiconductor (MOS) processes have shown control and readout of individual spin qubits, yet quantum processors require two-qubit interactions to operate. Here, we use a 300 mm wafer MOS process customized for spin qubits and demonstrate coherent control of two electron spins using the spin-spin exchange interaction, forming the basis of an entangling gate such as $\sqrt{\text{SWAP}}$. We observe gate dephasing times of up to $T_2^{*}\approx500$ ns and a gate quality factor of 10. We further extend the coherence by up to an order of magnitude using an echo sequence. For readout, we introduce a dispersive readout technique, the radiofrequency electron cascade, that amplifies the signal while retaining the spin-projective nature of dispersive measurements. Our results demonstrate an industrial grade platform for two-qubit operations, alongside integration with dispersive sensing techniques.

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