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Overcoming resolution limits with quantum sensing by utilising error correction Alex Ratzker

Thursday, December 19, 2019 - 11:15 to 12:30 Auditorium

Quantum sensing and metrology exploit quantum aspects of individual and complex systems to measure a physical quantity. Quantum sensing targets a broad spectrum of physical quantities, of both static and time-dependent types. While the most important characteristic for static quantities is sensitivity, for time-dependent signals it is the resolution, i.e. the ability to resolve two different frequencies. The decay time of the probe imposes a fundamental limit on the quantum sensing efficiency. While error correction methods can prolong this time it was not clear if such a procedure could be used in a quantum sensing protocol. In this talk I will present a study of spectral resolution problems with quantum sensors, and the development of a new super-resolution method that relies on quantum features for which the limitation imposed by the finite decay time can be partially overcome by error correction.