BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Quantum Computing with Graphene Nanoribbons - Irati Alonso Calafel
 l\, University of Vienna
DTSTART:20201002T100000Z
DTEND:20201002T110000Z
UID:TALK151255@talks.cam.ac.uk
CONTACT:40340
DESCRIPTION:Among the various approaches to quantum computing\, all-optica
 l architectures are especially promising due to the robustness and mobilit
 y of single photons. However\, the creation of the two- photon quantum log
 ic gates required for universal quantum computing remains a challenge. Her
 e we propose a universal two-qubit quantum logic gate\, where qubits are e
 ncoded in surface plasmons in graphene nanostructures\, that exploits grap
 hene's strong third-order nonlinearity and long plasmon lifetimes to enabl
 e single-photon-level interactions. In particular\, we utilize strong two-
 plasmon absorption in graphene nanoribbons\, which can greatly exceed sing
 le-plasmon absorption to create a “square-root-of-swap” that is protec
 ted by the quantum Zeno effect against evolution into undesired failure mo
 des. Our gate does not require any cryogenic or vacuum technology\, has a 
 footprint of a few hundred nanometers\, and reaches fidelities and success
  rates well above the fault-tolerance threshold\, suggesting that graphene
  plasmonics offers a route towards scalable quantum technologies. \n\nRefe
 rences\n\n1) Alonso Calafell\, et al. npj Quantum Information 5\, 37 (2019
 )\, https://www.nature.com/articles/s41534-019-0150-2 \n\nZoom Link\n\nPle
 ase click the link below to join the webinar:\nhttps://us02web.zoom.us/j/8
 6846521451?pwd=M0VUSE5wTEJwSndCbEx0VUtqNHpuZz09\nPasscode: 226745\n
LOCATION:Virtually\, at Zoom
END:VEVENT
END:VCALENDAR