BEGIN:VCALENDAR VERSION:2.0 CALSCALE:GREGORIAN PRODID:iCalendar-Ruby BEGIN:VEVENT CATEGORIES:Lectures & Presentations DESCRIPTION:The Physics & Astronomy Colloquium Series presents Stephen Gray \, The Argonne Distinguished Fellow 2021 of Argonne National Laboratory\, d iscussing "Optimum Times for Quantum Sensing in Open Systems and the Challe nges of Herding Quantum Cats"\, on Sept. 8.\n\n \n\nAbstract: Quantum sensi ng and metrology involve the use of quantum phenomena such as superposition and entanglement to increase the precision of parameter estimation. The pa rameters in question correspond to a system’s properties\, e.g.\, energy le vel separations. The system may be one or more quantum objects or probes in the presence of some field of interest\, as in the use of NV centers to inf er magnetic field strengths. Such a system may not be isolated and can inter act with a larger environment leading to dephasing and dissipation. This op en system dynamics can be described with quantum master equations such as t he Lindblad equation. A fundamental quantity in quantum sensing is the quan tum Fisher information (QFI) and conditions upon which it is large are idea l\, since the QFI is inversely related to the best achievable precision. By solving the Lindblad equation for a variety of open systems and determinin g the time evolution of the QFI\, it is shown how there can exist optimum t ime ranges for quantum sensing. An experimental parameter estimation proced ure for capitalizing on this idea is suggested. DTEND:20230908T210000Z DTSTAMP:20241123T024735Z DTSTART:20230908T201000Z GEO:39.322732;-82.10287 LOCATION:Walter Hall\, 145 SEQUENCE:0 SUMMARY:Physics Colloquium | "Optimum Times for Quantum Sensing in Open Sy stems and the Challenges of Herding Quantum Cats"\, Sept. 8 UID:tag:localist.com\,2008:EventInstance_44021312912077 URL:https://calendar.ohio.edu/event/physics_colloquium_quantum_cat_and_quan tum_sensors_sept_8 END:VEVENT END:VCALENDAR