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UID:DSC-21473
DTSTART;TZID=Europe/Berlin:20241125T163000
SEQUENCE:1732516638
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20241125T173000
URL:https://www.dresden-science-calendar.de/calendar/de/detail/21473
LOCATION:MPI-PKS\, Nöthnitzer Straße 3801187 Dresden
SUMMARY:Chekhovich: Nuclear spins in semiconductor quantum dots: a many-bod
 y quantum system with interesting physics and prospective applications in 
 quantum technologies
CLASS:PUBLIC
DESCRIPTION:Speaker: Dr. Evgeny Chekhovich\nInstitute of Speaker: Universit
 y of Sussex\nTopics:\nPhysik\n Location:\n  Name: MPI-PKS ()\n  Street: N
 öthnitzer Straße 38\n  City: 01187 Dresden\n  Phone: + 49 (0)351 871 0\n
   Fax: \nDescription: Epitaxial semiconductor quantum dots (QDs) have long
  been investigated in the context of quantum physics and quantum informati
 on processing (QIP). The solid-state nature of the quantum dots poses many
  challenges. One such challenge comes from the magnetic moments of the ato
 mic nuclei that make up the crystal lattice of a QD. The dense 3D lattice 
 of the nuclear spins often acts as a source of magnetic noise\, limiting q
 uantum coherence of the electron and photon qubits. However\, introduction
  of a new generation of low-strain optically-active GaAs/AlGaAs QDs has sh
 ifted the paradigm with recent efforts focused on harnessing nuclear spin 
 magnetism as a testbed for fundamental quantum physics and QIP application
 s. The advances of the past few years include demonstrations of electron [
 1] and nuclear [2] spin qubits in a semiconductor quantum dot\, as well as
  reversible transfer of quantum states between electron and nuclear spins 
 [3]\, offering a pathway to implementation of a solid-state quantum memory
 .  I will discuss recent advanced both in fundamental physics and prospect
 ive applications of QD nuclear spins in QIP. Recent findings include an ex
 perimental answer to the long-standing dilemma of nuclear spin diffusion i
 n a central-spin model [4]\; ferromagnetic ordering of nuclear spin ensemb
 les\, with record-high polarisations exceeding 95% [5]\; nondemolition mea
 surement of the central electron spin through entanglement with a nuclear 
 spin ensemble [6]\, which allows for single-shot qubit readout with fideli
 ties exceeding 99.85%. Moreover\, we show how strain-engineering of semico
 nductor lattice can be used to turn the nuclear spin ensemble into an effi
 cient quantum memory\, which can store coherent states for very long times
 \, exceeding 100 ms.  [1] L. Zaporski et al.\, Nature Nano 18\, 257 (2023)
  [2] E. A. Chekhovich et al.\, Nature Nano 15\, 999 (2020) [3] M. Appel\, 
 et al.\, arXiv:2404.19680 (2024) [4] P. Millington-Hotze\, et al.\, Nature
  Comm. 14\, 2677 (2023) [5] P. Millington-Hotze\, et al.\, Nature Comm. 15
 \, 985 (2024) [6] H. Dyte et al.\, Phys. Rev. Lett. 132\, 160804 (2024)
DTSTAMP:20260701T043129Z
CREATED:20241108T115707Z
LAST-MODIFIED:20241125T063718Z
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