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[Fizinfo] BME Elm. Fiz. Szeminárium, nov. 20, Pataki Dávid


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  • From: Janos Asboth <asboth AT phy.bme.hu>
  • To: fizinfo AT lists.kfki.hu, elmfiz.oktatok-kutatok AT lists.bme.hu, elmfiz.hallgatok AT lists.bme.hu
  • Subject: [Fizinfo] BME Elm. Fiz. Szeminárium, nov. 20, Pataki Dávid
  • Date: Wed, 18 Nov 2020 12:49:09 +0100

Meghívó

BME Elméleti Fizika Szeminárium,

november 20. péntek 10h15,
online a Microsoft Teams-ben
<https://teams.microsoft.com/l/meetup-join/19%3aae270a05b01c4c43b653f2ecf2869aad%40thread.tacv2/1603102214728?context=%7b%22Tid%22%3a%226a3548ab-7570-4271-91a8-58da00697029%22%2c%22Oid%22%3a%22c7eaf7d2-684b-4597-b217-6a9121400219%22%7d>

Pataki Dávid (BME Elm. Fiz. tanszék):

Triplet-blockaded Josephson supercurrent in double quantum dots

Topological superconductors are promising building blocks for future
quantum computers, although their experimental realization remains a
challenging task. In this talk, I will present theory results on a
Josephson junction with a double quantum dot, a minimal model system toward
engineered topological superconductivity based on quantum dot chains [1].
In the (1,1) charge sector of the serially coupled double quantum dot, I
will illustrate a magnetically induced singlet-triplet ground-state
transition via triplet blockade: the Josephson current carried by the
triplet ground state at high magnetic field is much suppressed compared to
the current carried by the singlet ground state at low magnetic field. The
theory results I present are based on the zero-bandwidth approximation. I
will provide simple arguments for a strong triplet blockade in the
large-gap, and the strong-Coulomb-repulsion limit. Furthermore I also
outline a process-counting argument that supports partial triplet
blockade in the intermediate regime, using perturbation theory. I will
also present experimental data showing the triplet blockade predicted by
the theory. The triplet blockade mechanism could provide a coupling
mechanism between spin qubits, and (topological or non-topological)
superconducting qubits.

[1] Bouman et al, arXiv:2008.04375

Minden érdeklődőt szeretettel várunk.

Asbóth János
szemináriumi koordinátor


  • [Fizinfo] BME Elm. Fiz. Szeminárium, nov. 20, Pataki Dávid, Janos Asboth, 11/18/2020

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