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SUMMARY:To catch and reverse a quantum jump mid-flight - Dr. Zlatko K. Min
 ev\, Research Scientist\, IBM Quantum Computing
DTSTART:20190913T143000Z
DTEND:20190913T160000Z
UID:TALK129355@talks.cam.ac.uk
CONTACT:Lynn Campbell
DESCRIPTION:In quantum physics\, measurements can fundamentally yield disc
 rete and random results. Emblematic of this feature is Bohr’s 1913 propo
 sal of quantum jumps between two discrete energy levels of an atom. Experi
 mentally\, quantum jumps were first observed in an atomic ion driven by a 
 weak deterministic force while under strong continuous energy measurement.
  The times at which the discontinuous jump transitions occur are reputed t
 o be fundamentally unpredictable. Despite the non-deterministic character 
 of quantum physics\, is it possible to know if a quantum jump is about to 
 occur? Here we answer this question affirmatively: we experimentally demon
 strate that the jump from the ground state to an excited state of a superc
 onducting artificial three-level atom can be tracked as it follows a predi
 ctable ‘flight’\, by monitoring the population of an auxiliary energy 
 level coupled to the ground state. The experimental results demonstrate th
 at the evolution of each completed jump is continuous\, coherent and deter
 ministic. We exploit these features\, using real-time monitoring and feedb
 ack\, to catch and reverse quantum jumps mid-flight—thus deterministical
 ly preventing their completion. Our findings\, which agree with theoretica
 l predictions essentially without adjustable parameters\, support the mode
 rn quantum trajectory theory and should provide new ground for the explora
 tion of real-time intervention techniques in the control of quantum system
 s\, such as the early detection of error syndromes in quantum error correc
 tion.
LOCATION:Ryle Seminar Room (930) 
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