High precision low-temperature quantum thermometry via dynamical control

ANALIA ZWICK; VICTOR MUKHERJEE; ARNAB GHOSH; GERSHON KURIZKI

Buenos Aires

Congreso; Humboldt Colloquium ?Shaping the Future of German-Argentinian Scientific Cooperation ? The Role of Curiosity-Driven Research?; 2018

Alexander von Humboldt Fundation

Precise probing of quantum systems is one of the keys to progress in diverse quantum technologies, including quantum metrology, quantum information processing and quantum many-body manipulations. We consider a thermometer modelled by a dynamically-controlled multilevel quantum system in contact with a thermal bath. As opposed to the diverging relative error near absolute zero of previously suggested thermometers, dynamical control enables our thermometer to measure with high accuracy temperatures arbitrarily close to the absolute-zero temperature, achieving a constant temperature-independent relative error bound by maximizing its quantum Fisher information.