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SUMMARY:QSE Junior Quantum Seminar - Filippo Ferrari & Franco De Palma
DTSTART:20250311T090000
DTEND:20250311T110000
DTSTAMP:20261007T200207Z
UID:5b22472245826fc4dcd95412a052736d2bcef11d6b70c06c2956e1fd
CATEGORIES:Conferences - Seminars
DESCRIPTION:Filippo Ferrari\, Franco De Palma\nPlease join us for the Ju
 nior Quantum Seminar with Filippo Ferrari from the Laboratory of Theo
 retical Physics of Nanosystems (EPFL)\, who will give the talk "Dissipati
 ve quantum chaos: foundation and relevance for quantum technologies" and
  Franco De Palma from the Hybrid Quantum Circuits laboratory (EPFL) wh
 o will give the talk "Strong hole-photon coupling in planar Ge for probin
 g charge degree and Wigner molecule states" on Tuesday March 11th from 9h
 30-11h.\n\nPLEASE NOTE: The Junior Quantum Series are for gathering  the
  junior quantum community of master's students\, PhDs and post-docs at 
 EPFL\, to create a non-judgmental space were scientific ideas can be share
 d between peers. This event is not for Professors or senior researchers. 
 \n\nABSTRACT :\n\n	The study of chaos and integrability in open quantum ma
 ny-body systems is central in many research areas\, from high-energy physi
 cs to quantum optics\, from quantum technologies to condensed matter. To d
 ate\, dissipative quantum chaos is understood on the basis of the universa
 l predictions of non-Hermitian random matrix theory: in presence of chaos\
 , the generator of the dissipative dynamics (the so-called Liouvillian sup
 eroperator) behaves as a large random matrix. In this talk\, I introduce a
  novel definition of dissipative quantum chaos that allows explaining phys
 ical phenomena that would otherwise remain elusive\, including recent expe
 rimental findings. An open quantum system exhibits chaotic behavior if its
  Liouvillian spectral structure is described by random matrix theory and i
 f this structure significantly impacts individual stochastic realizations 
 of the dynamics\, commonly referred to as quantum trajectories. I discuss 
 several applications following from this theoretical framework. First\, I 
 consider the driven-dissipative Bose-Hubbard model\, a paradigmatic system
  for studying interacting quantum fluids of light. I clarify the interplay
  of integrability and chaos across its phase diagram\, paving the way for 
 the experimental observation of dissipative quantum chaos in\, e.g.\, supe
 rconducting-based quantum simulators. A recent experimental application co
 ncerns the transition from integrability to dissipative chaos in an open F
 loquet bosonic system. I extend the discussion to chains of coupled nonlin
 ear driven-dissipative oscillators\, where many-body effects lead to regul
 ar and chaotic dynamics. Second\, I focus on the dispersive readout of a t
 ransmon qubit\, showing how dissipative quantum chaos can emerge in the ci
 rcuit quantum electrodynamics architecture underlying the qubit’s readou
 t\, enhancing or destroying the instrument’s performance. Generally spea
 king\, further study is warranted to understand in a more systematic way h
 ow dissipative chaos can affect the performance of quantum computing devic
 es.\n	Semiconductor quantum dots (QDs) in planar germanium (Ge) heterostru
 ctures have emerged as front-runners for future hole-based quantum process
 ors. Here\, we present strong coupling between a hole charge qubit\, defin
 ed in a double quantum dot (DQD) in planar Ge\, and microwave photons in a
  high-impedance (Zr = 1.3 kΩ) resonator based on an array of superc
 onducting quantum interference devices (SQUIDs). Our investigation reveals
  vacuum-Rabi splitting with coupling strengths up to g0/2π = 260 MH
 z\, and a cooperativity of C ~ 100\, dependent on DQD tuning. Furthermore\
 , utilizing the frequency tunability of our resonator\, we explore the que
 nched energy splitting associated with strong Coulomb correlation effects 
 in Ge QDs. The observed enhanced coherence of the strongly correlated exci
 ted state signals the presence of distinct symmetries within related spin 
 functions\, serving as a precursor to the strong coupling between photons 
 and spin-charge hybrid qubits in planar Ge. This work paves the way toward
 s coherent quantum connections between remote hole qubits in planar Ge\, r
 equired to scale up hole-based quantum processors.\n\nBIO:\n\n\n	Filippo F
 errari is a PhD student from LTPN lab headed by Professor Vincenzo Savona.
  His current research focuses on emergent phenomena in open quantum many-b
 ody systems.\n	Franco De Palma is a PhD student at the Hybrid Quantum Circ
 uits Laboratory lead by Prof. Pasquale Scarlino\, at EPFL. He got a bachel
 or’s degree in physics engineering at Politecnico di Torino and a master
 ’s degree in Nanotechnologies for ICTs from a master program shared amon
 g Politecnico di Torino\, INP Grenoble and EPFL. His research is focused o
 n the integration of high-impedance superconducting resonators with semico
 nducting quantum dots on a planar Ge/SiGe heterostructure for long-range q
 ubit connectivity\, fast high-fidelity readout\, analog quantum simulation
 s and high-efficiency GHz photodetectors.\n
LOCATION:CE 1 100 https://plan.epfl.ch/?room==CE%201%20100
STATUS:CONFIRMED
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