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[Fizinfo] BME Elm. Fiz. szeminarium, szept. 22. Kolok Baksa

From: Janos Asboth <asboth.janos AT ttk.bme.hu>
To: fizinfo AT lists.kfki.hu, elmfiz.hallgatok AT lists.bme.hu, elmfiz.oktatok-kutatok AT lists.bme.hu
Subject: [Fizinfo] BME Elm. Fiz. szeminarium, szept. 22. Kolok Baksa
Date: Wed, 20 Sep 2023 16:37:36 +0200
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Meghívó

BME Elméleti Fizika Szeminárium,

szept. 22. péntek 10h15,

1111 Budapest, Budafoki út 8., BME F III. magasföldszint 01.,
Elméleti Fizika Tanszék szemináriumi szoba

Kolok Baksa (BME Elm. Fiz. tanszék):
Protocols to measure the non-Abelian Berry phase by pumping a spin qubit
through a quantum-dot loop

A quantum system constrained to a degenerate energy eigenspace can undergo
a nontrivial time evolution upon adiabatic driving, described by a
non-Abelian Berry phase. This type of dynamics may provide logical gates in
quantum computing that are robust against timing errors. A strong candidate
to realize such holonomic quantum gates is an electron or hole spin qubit
trapped in a spin-orbit-coupled semiconductor, whose twofold Kramers
degeneracy is protected by time-reversal symmetry. In this talk, I propose
and quantitatively analyze protocols to measure the non-Abelian Berry phase
by pumping a spin qubit through a loop of quantum dots[1]. One of these
protocols allows us to characterize the local internal Zeeman field
directions in the dots of the loop. The near-term realisation of these
protocols is expected, as all key elements have been already demonstrated
in spin-qubit experiments. These experiments would be important to assess
the potential of holonomic quantum gates for spin-based quantum information
processing.

[1]: B. Kolok and A. Pályi: "Protocols to measure the non-Abelian Berry
phase by pumping a spin qubit through a quantum-dot loop",
arXiv:2308.05455 (2023)

Minden érdeklődőt szeretettel várunk.
Asbóth János,
szemináriumi koordinátor

[Fizinfo] BME Elm. Fiz. szeminarium, szept. 22. Kolok Baksa, Janos Asboth, 09/20/2023