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SUMMARY:Microwave cavity quantum electro/acousto-dynamics with superconduc
 tor-semiconductor hybrid technology
DTSTART:20180410T140000
DTEND:20180410T150000
DTSTAMP:20260407T045624Z
UID:61130a72ce65183a1ef5dcc393a91225a1c27fb8958ac59bfee9d428
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Pasquale Scarlino\, ETH Zurich\nAbstract: Semiconductor q
 ubits rely on the control of charge and spin degrees of freedom of electro
 ns or holes confined in quantum dots (QDs). Typically\, semiconductor qubi
 t-qubit coupling is short range\, effectively limiting qubit distance to t
 he spatial extent of the wavefunction of the confined particle (a few 100 
 nanometers). This is a significant constraint towards scaling of the QD-ba
 sed architectures to reach dense 1D or 2D arrays of QDs. Inspired by the s
 uccess of circuit QED (cQED)\, I will demonstrate the strong coupling limi
 t of cavity QED with individual charges and spins in GaAs quantum dots by 
 using the enhancement of the electric component of the vacuum fluctuations
  of a resonator with impedance beyond the typical 50 Ohm of standard copla
 nar waveguide technology.\n\nBy making use of this hybrid technology\, I r
 ecently realized a proof of concept experiment\, where the coupling betwee
 n a transmon qubit and a double QD (DQD) is mediated by virtual microwave 
 photon excitations in a high impedance SQUID array resonator\, which acts 
 as a quantum bus enabling long-range coupling between dissimilar qubits. F
 urthermore\, a similar solution can be implemented also to realize a coher
 ent coupling between two double quantum dot charge qubits placed ~50 um fa
 r away.\n\nElectron charge and spin embedded in a solid-state environment 
 experience also a strong interaction with the crystal lattice vibrations\,
  which are the main responsible of the energy relaxation process. Among th
 ose phononic vibrations\, surface acoustic waves (SAW) have attracted much
  interest as an alternative quantum mode localized at the surface of a mat
 erial. I will explore a new innovative cQED architecture in which the elec
 tric field of the photon is replaced by the electric field of SAW phonons\
 , confined in a SAW cavity. It is possible to envision a hybrid architectu
 re where artificial atoms (superconducting qubits\, QDs charge and spin qu
 bits) are strongly-coupled simultaneously to a microwave superconducting r
 esonator (photonic modes) and to a piezomachanical cavity (phononic modes)
 . This will allow to explore light/matter hybridization in a class of soli
 d-state systems and regimes which are new in the context of cavity QED and
  to make use of those phonons as a new computational resource.
LOCATION:CH G1 495 https://plan.epfl.ch/?room==CH%20G1%20495
STATUS:CONFIRMED
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