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SUMMARY:QSE Quantum Seminar: High-fidelity entanglement and coherent multi
 -qubit mapping in an atom array\, Alex Baumgartner
DTSTART:20260108T120000
DTEND:20260108T133000
DTSTAMP:20260507T025214Z
UID:c687878891cbcccd87060b4070b2d2f7ad5f5e87b9e6c096f1c6554d
CATEGORIES:Conferences - Seminars
DESCRIPTION:Alex Baumgartner\nPlease join us for the QSE Center Quantum
  Seminar with Alex Baumgartner from University of Colorado Boulder who
  will give the talk "High-fidelity entanglement and coherent multi-qubit 
 mapping in an atom array" on Thursday January 8 from 12pm to 1:30pm.\nLoc
 ation: CM 1 120\n\nPizzas will be available at 12:00. All PhDs\, postdocs
 \, students\, group leaders\, and PIs are welcome to join us.\n\nTITLE: "
 High-fidelity entanglement and coherent multi-qubit mapping in an atom arr
 ay"\n\nABSTRACT:\nNeutral atoms in optical tweezer arrays possess broad ap
 plicability for quantum information science\, in computing\, simulation\, 
 and metrology. Among atomic species\, Ytterbium-171 is unique as it hosts 
 multiple qubits\, each of which is impactful for these distinct applicatio
 ns. Consequently\, this atom is an ideal candidate to bridge multiple disc
 iplines\, which\, more broadly\, has been an increasingly effective strate
 gy within the field of quantum science. Realizing the full potential of th
 is synergy requires high-fidelity generation and transfer of many-particle
  entanglement between these distinct qubit degrees of freedom\, and thus b
 etween these distinct applications. Here we demonstrate the creation and c
 oherent mapping of entangled quantum states across multiple qubits in Ytte
 rbium-171 tweezer arrays. We map entangled states onto the optical clock q
 ubit from the nuclear spin qubit or the Rydberg qubit. We coherently trans
 fer up to 20 atoms of a Z2-ordered Greenberger-Horne-Zeilinger (GHZ) state
  from the interacting Rydberg manifold to the metastable nuclear spin mani
 fold. The many-body state is generated via a novel disorder-robust pulse i
 n a two-dimensional ladder geometry. We further find that clock-qubit-base
 d spin detection applied to Rydberg and nuclear spin qubits facilitates at
 om-loss-detectable qubit measurements and >90% Rydberg decay detection. Th
 is enables mid-circuit and delayed erasure detection\, yielding an error-d
 etected two-qubit gate fidelity of 99.78(4)% in the metastable qubits. Thi
 s error detection also enables Rydberg qubit evolution with an effective l
 ifetime of 1.2(2) ms\, enhancing the fidelity of the observed many-body dy
 namics. These results establish a versatile architecture that advances mul
 tiple fields of quantum information science while also establishing bridge
 s between them. \n\nBIO: \nAlex Baumgartner is post-doc at JILA and univ
 ersity of Colorado at Boulder\, in the group of Adam Kaufman. He did his P
 hD at ETHZ in 2024 on dissipation\, topology and subradiance in cavity qua
 ntum electrodynamics. \n 
LOCATION:CM 1 120 https://plan.epfl.ch/?room==CM%201%20120
STATUS:CANCELLED
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