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DTSTART:20230312T070000
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DTSTART;TZID=America/Toronto:20240205T143000
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URL:/institute-for-quantum-computing/events/achieving-q
 uantum-sensing-limits-noisy-environment
SUMMARY:Achieving quantum sensing limits in noisy environment
CLASS:PUBLIC
DESCRIPTION:Summary \n\nIQC COLLOQUIUM - SISI ZHOU\, THE PERIMETER INSTITUT
 E\n\nQuantum-Nano Centre\, 200 University Ave West\, Room QNC 0101 Waterlo
 o\,\nON CA N2L 3G1\n\n Quantum metrology studies estimation of unknown pa
 rameters 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\nclassica
 lly-achievable standard quantum limit 1/√N. The Heisenberg\nlimit is att
 ainable using multi-probe entanglement in the ideal\,\nnoiseless case. How
 ever\, in presence of noise\, many quantum systems\nonly allow a constant 
 factor of improvement over the standard quantum\nlimit. To elucidate the n
 oise effect in quantum metrology\, we prove a\nnecessary and sufficient co
 ndition for achieving the Heisenberg limit\nusing quantum controls. We sho
 w that when the condition is satisfied\,\nthere exist quantum error correc
 tion protocols to achieve the\nHeisenberg limit\; when the condition is vi
 olated\, no quantum controls\ncan break the standard quantum limit (althou
 gh quantum error\ncorrection can be used to maximize the constant-factor i
 mprovement).\nWe will also discuss the modified sensing limits when only r
 estricted\ntypes of quantum controls can be applied. \n 
DTSTAMP:20250603T213406Z
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