# Mathematics Colloquia and Seminars

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### Communicating over Quantum Channels

**Colloquium**

Speaker: | Matt Hastings, Microsoft Research |

Location: | 1147 MSB |

Start time: | Mon, Oct 26 2009, 4:10PM |

Information theory started with the problem of sending information over a noisy communication channel. In this talk, I will explain to a general audience the type of tasks one would like to accomplish with a quantum communication channel, either communicating classical or quantum information and using inputs and measurements that are either entangled or not, and I will use entropy differences to quantify the rate at which information can be sent. After motivating the mathematical problems in terms of communication tasks, I will describe recent results in channel capacity, focusing on those aspects that can be understood in terms of probability theory.

Refreshments will be served before the talk.