Freiburg 2019 – scientific programme

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FM: Fall Meeting

FM 14: Quantum Computation: Hardware Platforms I

FM 14.2: Talk

Monday, September 23, 2019, 14:30–14:45, 3044

Engineering Si-based quantum devices viable as hardware back-end in a full-stack quantum computer prototype — •Thorsten Last, Nodar Samkharadze, Amir Sammak, Delphine Brousse, Pieter Eendebak, Richard Versluis, Menno Veldhorst, Lieven Vandersypen, and Jeremy Veltin — QuTech - TU Delft/TNO, Lorentzweg 1, 2628 CJ Delft, NL

We will present a technology development framework in which Si spin qubit based quantum devices can become a viable option as hardware back-end in prototype quantum computers (QC). A chip which is considered to be a component of such an architecture asks for more stringent specs in stability than required for proof of principle experiments. Taking this requirement into account we developed a manufacturing feedback loop including materials, fabrication and electrical screening. However, implementing these device manufacturing needs in shared R&D facilities is found to be a challenging task. Still, parts of the feedback loop have been applied to manufacture Si-based devices made to host two spin qubits. Our devices consist of gate-defined double quantum dots formed in an undoped Si-28 quantum well embedded in a SiGe heterostructure. Fast readout of the quantum dot states is performed with a nearby single electron transistor. The devices consistently reach the few-electron regime. Spin lifetimes of around 30 ms are in line with previous results on Si. The device tune up to qubit-level is ongoing. If completed these devices will be utilized as processing units in our QC prototype platform (www.quantum-inspire.com).