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DTSTART;TZID=America/New_York:20210325T110000
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CREATED:20210303T143451Z
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UID:4421-1616670000-1616673600@seasevents.nmsdev7.com
SUMMARY:ESE Seminar: "Engineering Quantum Processors in Silicon"
DESCRIPTION:Across the globe\, physicists in academia and industry alike are competing to be the first to build a scalable universal quantum computer. Amongst the multitudes of quantum computing architectures\, solid-state quantum processors based on spins in silicon are emerging as a strong contender. Silicon is an ideal material to host spin qubits: it supports long coherence times [1]\, has excellent prospects for scaling\, and is ubiquitous in the semiconductor industry. While semiconductor spin qubits were proposed over two decades ago [2]\, it is only within the past few years that we have learned how to reliably fabricate and control multi-qubit devices in silicon. \n\nIn this seminar\, I will describe our state-of-the-art four-qubit Si/SiGe quantum processor [3] and explain how we have overcome major barriers to realizing large-scale quantum computing in silicon. First\, I will discuss charge control and spin-state readout in the device. Then\, I will describe the use of an on-chip micromagnet to mediate electrically driven spin resonance [4-5]. Using this technique\, we achieved site-selective qubit control with fidelities exceeding 99.9%. I will give an overview of our three primitive two-qubit gates—the decoupled-CZ gate [4]\, the resonant CNOT gate [5]\, and the resonant SWAP gate [6]—and discuss the limitations to control fidelities. Finally\, I will show how these advances enable the development of large-scale quantum processors capable of complex quantum information processing. \nReferences:\n[1] Tyryshkin et al.\, Nature Mat. 11\, 143 (2011)\n[2] Loss and Divincenzo\, Phys. Rev. A 57\, 120 (1998)\n[3] Sigillito et al.\, Phys. Rev. Applied 11\, 061006 (2019)\n[4] Watson et al.\, Nature 555\, 633 (2018)\n[5] Zajac\, Sigillito\, et al.\, Science 359\, 439 (2018)\n[6] Sigillito et al.\, npj Quantum Information 5\, 110 (2019)
URL:https://seasevents.nmsdev7.com/event/ese-seminar-engineering-quantum-processors-in-silicon-2/
LOCATION:Zoom – Email ESE for Link jbatter@seas.upenn.edu
CATEGORIES:Seminar,Faculty,Colloquium,Student
ORGANIZER;CN="Electrical and Systems Engineering":MAILTO:eseevents@seas.upenn.edu
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