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DTSTART:20260329T030000
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DTSTAMP:20260425T075303Z
UID:692887748fe28881065406@ist.ac.at
DTSTART:20251216T100000
DTEND:20251216T110000
DESCRIPTION:Speaker: Pablo Cova Farina\nhosted by Georgios Katsaros\nAbstra
 ct: The field of analog quantum simulations promises to shed light into so
 me of the most formidable questions of solid-state physics before digital 
 quantum computers reach quantum practicality. In this context\, semiconduc
 tor gate-defined quantum dots have emerged as an appealing platform for qu
 antum simulations\, due to the direct mapping of their Hamiltonian to a Fe
 rmi-Hubbard or Heisenberg model\, as well as the precise control of onsite
  energies and nearest-neighbor interactions. Out of all available quantum 
 dot platforms\, quantum dot arrays in planar germanium have quickly scaled
  up in the past years\, with device sizes approaching the many-body thresh
 old.In this talk\, I will introduce the basic concepts of analog quantum s
 imulators and present two concrete examples\, where we use a 4x2 quantum d
 ot ladder in Ge/SiGe to simulate the physical properties of coupled spins 
 in the presence of g-factor variability and different interaction strength
 s. In our first work\, we simulate the dynamics of single-spin excitations
  (magnons) and two-spin excitations (triplons). Using a methodology that c
 ombines digital spin qubit operations for initialization and readout with 
 analog evolution\, we are able to reconstruct quantum walk plots for vario
 us configurations of exchange couplings. Subsequently\, we combine these m
 ethods to probe the energy spectrum of spin chains of up to 8 coupled spin
 s by means of many-body interferometry. We observe signatures of a transit
 ion between an interaction-dominated (chaotic) and a disorder-dominated (l
 ocalized) phase. These experiments pave the way for more complex simulatio
 ns of spin physics with quantum dot arrays.
LOCATION:Mondi Seminar Room 3\, Central Building\, ISTA
ORGANIZER:gkatsaro@ist.ac.at
SUMMARY:Pablo Cova Farina: Simulating spin physics with quantum dot ladders
URL:https://talks-calendar.ista.ac.at/events/6215
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