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DTSTART:20230312T070000
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DTSTART:20231105T060000
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DTSTART;TZID=America/Toronto:20240205T143000
SEQUENCE:0
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URL:https://uwaterloo.ca/institute-for-quantum-computing/events/achieving-q
 uantum-sensing-limits-noisy-environment
LOCATION:QNC - Quantum Nano Centre 200 University Avenue West QNC 0101 Wate
 rloo ON N2L 3G1 Canada
SUMMARY:Achieving quantum sensing limits in noisy environment
CLASS:PUBLIC
DESCRIPTION:IQC COLLOQUIUM - SISI ZHOU\, THE PERIMETER INSTITUTE\n\nQuantum
 -Nano Centre\, 200 University Ave West\, Room QNC 0101 Waterloo\,\nON CA N
 2L 3G1\n\n Quantum metrology studies estimation of unknown parameters in\
 nquantum systems. The Heisenberg limit of estimation precision 1/N\,\nwith
  N being the number of probes\, is the ultimate sensing limit\nallowed by 
 quantum mechanics that quadratically outperforms the\nclassically-achievab
 le standard quantum limit 1/√N. The Heisenberg\nlimit is attainable usin
 g multi-probe entanglement in the ideal\,\nnoiseless case. However\, in pr
 esence of noise\, many quantum systems\nonly allow a constant factor of im
 provement over the standard quantum\nlimit. To elucidate the noise effect 
 in quantum metrology\, we prove a\nnecessary and sufficient condition for 
 achieving the Heisenberg limit\nusing quantum controls. We show that when 
 the condition is satisfied\,\nthere exist quantum error correction protoco
 ls to achieve the\nHeisenberg limit\; when the condition is violated\, no 
 quantum controls\ncan break the standard quantum limit (although quantum e
 rror\ncorrection can be used to maximize the constant-factor improvement).
 \nWe will also discuss the modified sensing limits when only restricted\nt
 ypes of quantum controls can be applied. 
DTSTAMP:20260405T221744Z
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