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DTSTART:20240310T070000
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DTSTART:20231105T060000
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DTSTART;TZID=America/Toronto:20240326T143000
SEQUENCE:0
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URL:https://uwaterloo.ca/institute-for-quantum-computing/events/quantum-sig
 nal-and-noise-towards-intermediate-term-quantum
LOCATION:QNC - Quantum Nano Centre 200 University Avenue West 0101 Waterloo
  ON N2L 3G1 Canada
SUMMARY:The (Quantum) Signal and the Noise: towards the intermediate term o
 f\nquantum computation
CLASS:PUBLIC
DESCRIPTION:THE (QUANTUM) SIGNAL AND THE NOISE: TOWARDS THE INTERMEDIATE TE
 RM OF\nQUANTUM COMPUTATION\n\nUniversity of Waterloo\, 200 University Ave 
 West QNC 0101 + ZOOM\n\nCan we compute on small quantum processors? In thi
 s talk\, I explore\nthe extent to which noise presents a barrier to this g
 oal by quickly\ndrowning out the information in a quantum computation. Noi
 se is a\ntough adversary: we show that a large class of error mitigation\n
 algorithms -- proposals to \"undo\" the effects of quantum noise\nthrough
  mostly classical post-processing – can never scale up.\nSwitching gears
 \, we next explore the effects of non-unital noise\, a\nphysically natural
  (yet analytically difficult) class of noise that\nincludes amplitude-damp
 ing and photon loss. We show that it creates\neffectively shallow circuits
 \, in the process displaying the strongest\nknown bound on average converg
 ence of quantum states under such noise.\nConcluding with the computationa
 l complexity of learning the outputs\nof small quantum processors\, I will
  set out a program for wrapping\nthese lower bounds into new directions to
  look for near-term quantum\ncomputational advantage. 
DTSTAMP:20260414T145841Z
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