| Autor: |
Chittock-Wood, Jacob F., Leon, Ross C. C., Fogarty, Michael A., Murphy, Tara, Patomäki, Sofia M., Oakes, Giovanni A., von Horstig, Felix-Ekkehard, Johnson, Nathan, Jussot, Julien, Kubicek, Stefan, Govoreanu, Bogdan, Wise, David F., Gonzalez-Zalba, M. Fernando, Morton, John J. L. |
| Rok vydání: |
2024 |
| Předmět: |
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| Druh dokumentu: |
Working Paper |
| Popis: |
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. |
| Databáze: |
arXiv |
| Externí odkaz: |
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