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UID:69da95a4b2e24
DTSTAMP:20260411T144036
DTSTART:20180618T113000
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URL:https://murmitoyen.com/events/vanille/udem/detail/821441-controlling-a-
 mesoscopic-spin-system-with-coherent-optics-gabriel-ethier-majcher-cambrid
 ge
LOCATION:Université de Montréal - Pavillon Roger-Gaudry\, 2900\, chemin d
 e la Tour\, Montréal\, QC\, Canada\, H3T 1J6
SUMMARY:Controlling a mesoscopic spin system with coherent optics - Gabriel
  Éthier-Majcher (Cambridge)
DESCRIPTION:Controlling a mesoscopic spin system with coherent opticsGabrie
 l Éthier-MajcherAtomic\, Mesoscopic and Optical Physics\, Cavendish Labor
 atoryUniversity of Cambridge
\nAbstract: 
\nQuantum correlations are at t
 he heart of quantum science and technologies. In recent years\, there has 
 been tremendous progress in harnessing quantum correlations in various phy
 sical systems\, paving the way to applications such as quantum networks\, 
 quantum computers and quantum simulators. Self-assembled semiconductor qua
 ntum dots are an outstanding system to explore quantum correlations from b
 oth technological and fundamental perspectives: on the one hand\, they off
 er the brightest spin-photon interface\, which has been used to entangle d
 istant spins with a record-high rate. On the other hand\, the strong inter
 action of the electron with the surrounding ~105 nuclei forming the quantu
 m dot offers opportunities to probe many-body quantum phenomena.
\nIn this
  talk\, I will show that the nuclear spin environment of a quantum dot can
  be optically controlled and prepared in non-trivial states by exploiting 
 the hyperfine interaction between a single electron and the mesoscopic nuc
 lear ensemble. By driving Raman transitions between the spin states of the
  electron\, a feedback mechanism locking the nuclei to a reduced-entropy s
 tate is engineered. This process is analogous to Raman sideband cooling de
 veloped in atomic physics. The immediate implication of the nuclear coolin
 g for quantum information processing is a thirtyfold extension of the elec
 tron T2*\, which will increase the fidelity of spin-photon entanglement in
  quantum dots.
\nOur control over the nuclear ensemble can be used to opti
 cally generate quantum correlations within the nuclear spin ensemble. I wi
 ll describe possible avenues to achieve this goal\, including optically-dr
 iven nuclear excitations and ensemble spin squeezing. Our results set the 
 stage for investigations of quantum many-body physics in quantum dots and 
 are a stepping-stone towards the realization of quantum memories.
\nWeb pa
 ge of the group.
\nCette conférence est présentée par le RQMP Versant
  Nord du Département de physique de l'Université de Montréal et de G
 énie physique de la Polytechnique.
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