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SUMMARY:Taking control of coherent superconducting quantum electronics - I
 rfan Siddiqi (UC Berkeley)
DTSTART:20140808T100000Z
DTEND:20140808T110000Z
UID:TALK53734@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:Electronic circuits which exhibit quantum mechanical phenomena
 —superposition and entanglement\, in particular—promise a new generati
 on of computers capable of solving currently intractable problems\, secure
  communication\, precision metrology\, detectors with unparalleled sensiti
 vity\, and an efficient route for synthesizing new materials. One of the f
 undamental challenges\, however\, in realizing quantum machines is to sust
 ain coherence over a time interval practical for performing coherent opera
 tions or computation.  Until now\, boosting coherence has involved hardwar
 e development to minimize coupling to a dissipative environment which typi
 cally transforms a quantum superposition into a classical state. Recent ad
 vances in the development of robust quantum-noise-limited microwave amplif
 iers and quantum bits with lifetimes in excess of 100 microseconds have en
 abled the use of feedback to actively suppress decoherence. In particular\
 , we have been able to tailor the dissipative environment\, either via mea
 surement or excitation pulses\, to stabilize quantum superposition states 
 and coherent oscillations as well as track the evolution of single and two
  qubit states. These advances in precision measurement and control are key
  for implementing practical quantum circuits for microwave photonics and i
 nterferometry as well as simulations of exemplar many-body systems such as
  the Ising chain
LOCATION:Rutherford building\, Seminar Room B
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