Entanglement and discord for qubits and higher spin systems

Pramana

A R P Rau1¹ 

[1] Department of Physics and Astronomy, Louisiana State University, Baton Rouge 70803, USA$$

关键词: Quantum information;    quantum computing;    qubit;    entanglement;    quantum discord;    mixed states;    density matrix;    X-states;    entropy;    quantum mutual information;    geometric discord.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

We discuss aspects of entanglement and quantum discord, two of the quantum correlations that are of much interest in the field of quantum information. Their definitions and handling will be discussed, with simple illustrative examples. A specific example is of entanglement decay resulting from a simple dissipative process and how to alter that decay. An analytical prescription for computing quantum discord when a qubit (spin-1/2 or two-level quantum system) is involved is presented along with applications, and its generalization to higher spins (many levels) indicated.

【 授权许可】

Unknown