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SUMMARY:Fast high fidelity quantum non-demolition qubit readout via a non-
 perturbative cross-Kerr coupling
DTSTART;VALUE=DATE-TIME:20190620T140000Z
DTEND;VALUE=DATE-TIME:20190620T143000Z
DTSTAMP;VALUE=DATE-TIME:20261017T061933Z
UID:indico-contribution-247@cern.ch
DESCRIPTION:Speakers: Rémy Dassonneville (Institut Néel)\nQubit readout 
 is an indispensable element of any quantum information processor.  In this
  work\,\nwe propose an original coupling scheme between a qubit and a cavi
 ty mode based on a non-perturbative\ncross-Kerr interaction. This scheme\,
  using the same experimental techniques as the perturbative cross-Kerr cou
 pling (dispersive interaction)\, leads to an alternative readout mechanism
  for superconducting qubits.  This\nnew  process\,  being  non-perturbativ
 e\, maximizes the speed  of  qubit  readout\,  its single-shot readout fid
 elity and\nits quantum non-demolition (QND) behavior at the same time\, wh
 ile minimizing the effect of unwanted decay channels such as\, for example
 \, the Purcell effect.   We  observed  97.4 %  single-shot\nreadout  fidel
 ity  for  short  50 ns  pulses.   Using  long  measurement\,  we  quantifi
 ed  the  QND-ness  to\n99 %.\n\nhttps://indico.unina.it/event/18/contribut
 ions/247/
LOCATION:Strand Hotel Terme Delfini
URL:https://indico.unina.it/event/18/contributions/247/
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