مشخصات پژوهش

عنوان	Tightening the entropic uncertainty relations formultiple measurements and applying it to quantumcoherence
نوع پژوهش	مقاله چاپ‌شده در مجلات علمی
کلیدواژه‌ها	Entropic uncertainty relations; Quantum coherence; Quantum memory ; Multiple measurements
چکیده	The uncertainty principle sets limit on our ability to predict the values of two incom- patible observables measured on a quantum particle simultaneously. This principle can be stated in various forms. In quantum information theory, it is expressed in terms of the entropic measures. Uncertainty bound can be altered by considering a particle as a quantum memory correlating with the primary particle. In this work, a method is provided for converting the entropic uncertainty relation in the absence of quantum memory to that in its presence. It is shown that the lower bounds obtained through the method are tighter than those having been achieved so far. The method is also used to obtain the uncertainty relations for multiple measurements in the presence of quantum memory. Also for a given state, the lower bounds on the sum of the relative entropies of unilateral coherences are provided using the uncertainty relations in the presence of quantum memory, and it is shown which one is tighter.
پژوهشگران	آرش سروری خراشاد (نفر چهارم)، شهریار سلیمی (نفر سوم)، سروش حاصلی (نفر دوم)، هژیر دولتخواه (نفر اول)