Quantum Discord Determines the Interferometric Power of Quantum States
نویسندگان
چکیده
منابع مشابه
Quantum discord of states arising from graphs
Quantum discord refers to an important aspect of quantum correlations for bipartite quantum systems. In our earlier works we have shown that corresponding to every graph (combinatorial) there are quantum states whose properties are reflected in the structure of the corresponding graph. Here, we attempt to develop a graph theoretic study of quantum discord that corresponds to a necessary and suf...
متن کاملCirculant States with Vanishing Quantum Discord
Quantum state of composite system contains both classical and quantum correlation. Usually by quantum correlations one means quantum entanglement which provides an essential resource for quantum information processing such as quantum cryptography, dense coding, quantum computing [1, 2]. However, a quantum state of a composed system may contain other types of nonclassical correlation even if it ...
متن کاملQuantum discord for two-qubit X states
Mazhar Ali,1,3,* A. R. P. Rau,2 and G. Alber1 1Institut für Angewandte Physik, Technische Universität Darmstadt, Darmstadt D-64289, Germany 2Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA 3Department of Electrical Engineering, COMSATS Institute of Information Technology, Abbottabad 22060, Pakistan (Received 18 February 2010; published 12 April...
متن کاملQuantum discord in quantum computation
Quantum discord is a measure of the quantumness of correlations. After reviewing its different versions and properties, we apply it to the questions of quantum information processing. First we show that changes in discord in the processed unentangled states indicate the need for entanglement in the distributed implementation of quantum gates. On the other hand, it was shown that zero system-env...
متن کاملOn the quantum discord of general X states
Quantum discord Q is a function of density matrix elements. The domain of such a function in the case of two-qubit system with X density matrix may consist of three subdomains at most: two ones where the quantum discord is expressed in closed analytical forms (Q π/2 and Q 0) and an intermediate subdomain for which, to extract the quantum discord Q θ , it is required to solve in general numerica...
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: Physical Review Letters
سال: 2014
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.112.210401