Description |
The field of quantum information embraces computing, cryptography or key distribution, and teleportation. All involve quantum correlations between two or more two-level quantum systems termed qubits. A qubit has, in some respects, much more power in speed and memory than a classical bit, so that there is excitement over the possibility of using them for varied applications. I will discuss some of the basic principles of quantum physics that underlie all this, and how to deal with some of these correlations such as ``entanglement'' and ``discord''. |