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DTSTART:20170326T030000
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DTSTART:20171029T020000
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DTSTAMP:20260427T115942Z
UID:593e7ce54d863804756289@ist.ac.at
DTSTART:20171024T110000
DTEND:20171024T123000
DESCRIPTION:Speaker: Menno Veldhorst\nhosted by Georgios Katsaros\nAbstract
 : Practical quantum computation is one of the greatest scientific challeng
 es this century. The spin states of single electrons in gate-defined quant
 um dots satisfy crucial requirements to become excellent qubits and key bu
 ilding blocks. Great experimental progress towards the goal of a future la
 rge-scale quantum computer has been made in the past few years. Demonstrat
 ions include qubits with extremely long coherence times\, high-fidelity qu
 antum operation\, two-qubit logic gates\, and small quantum algorithms. In
  this talk I will review the state-of-the-art. Based on these results we h
 ave developed a conceptual architecture\, that provides a path to increase
  the number of qubits to the required thousands or millions of qubits. The
  architecture is based on shared control and a scalable number of lines. C
 rucially\, the control lines define the qubit grid\, such that no local co
 mponents are required. The design enables qubit coupling beyond nearest ne
 ighbors\, providing prospects for non-planar quantum error correction prot
 ocols. Fabrication is based on a three-layer design to define qubit and tu
 nnel barrier gates. A double stripline on top of the structure can drive h
 igh-fidelity single-qubit rotations. Qubit addressability and readout are 
 enabled by self-aligned inhomogeneous magnetic fields induced by direct cu
 rrents through superconducting gates. Qubit coupling is based on the excha
 nge interaction and parallel two-qubit gates can be performed at the detun
 ing noise insensitive point. While the architecture requires a high level 
 of uniformity in the materials and critical dimensions to enable shared co
 ntrol\, it stands out for its simplicity. I will discuss perspectives on t
 he integration of such an architecture\, industrial approaches\, and exper
 imental research focussing on hot spin qubits to examine the robustness of
  spin qubits against power dissipation by local electronics. I will end wi
 th the prospect that quantum computation can be realized based on a single
  technology\, the same technology that defined our current information age
 .
LOCATION:Big Seminar room Ground floor / Office Bldg West (I21.EG.101)\, IS
 TA
ORGANIZER:jdeanton@ist.ac.at
SUMMARY:Menno Veldhorst: A crossbar network for silicon quantum dot qubits
URL:https://talks-calendar.ista.ac.at/events/838
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