منابع مشابه
Entropic information–disturbance tradeoff
We show the flaws found in the customary fidelity-based definitions of disturbance in quantum measurements and evolutions. We introduce the “entropic disturbance” D and show that it adequately measures the degree of disturbance, intended essentially as an irreversible change in the state of the system. We also find that it complies with an information–disturbance tradeoff, namely the mutual inf...
متن کاملInformation-Disturbance Tradeoff in Quantum State Discrimination
When discriminating between two pure quantum states, there exists a quantitative tradeoff between the information retrieved by the measurement and the disturbance caused on the unknown state. We derive the optimal tradeoff and provide the corresponding quantummeasurement. Such an optimal measurement smoothly interpolates between the two limiting cases of maximal information extraction and no me...
متن کاملInformation-disturbance tradeoff in quantum measurements
Extraction of information from a quantum system cannot always be without feedback. This was clear since the early days of quantum mechanics: It was the spirit of the original form of the Heisenberg uncertainty “principle”, as derived from the gedanken-experiment of the Heisenberg microscope [1]. Since then, much more refined descriptions of allowed quantum measurements have been put forth [2], ...
متن کاملInformation-disturbance tradeoff for spin coherent state estimation
The tradeoff between information retrieved from a quantum measurement and the disturbance caused on the state of a quantum system is a fundamental concept of quantum mechanics and has received a lot of attention in the literature [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]. Such an issue is studied for both foundations and its enormous relevance in practice, in the r...
متن کاملInformation-disturbance Tradeoff in Covariant Quantum State Estimation
There exists a precise tradeoff between the amount of information extracted from a quantum measurement and the amount of disturbance caused on the system, analogous to Heisenberg relations holding in the preparation procedure of a quantum state. The study of such a tradeoff is relevant for both foundation and its enormous relevance in practice, in the realm of quantum key distribution and quant...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Europhysics Letters (EPL)
سال: 2007
ISSN: 0295-5075,1286-4854
DOI: 10.1209/0295-5075/77/40002