# Mathematics Colloquia and Seminars

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### Cryptography for Quantum States

**Colloquium**

Speaker: | Dr. Daniel Gottesman, University of California, Berkeley |

Location: | 693 Kerr |

Start time: | Mon, Feb 11 2002, 4:00PM |

Someday, quantum states may be as valuable as classical data can be today. When that time comes, we will want to protect them in the same ways as we protect classical states. I will describe ways to perform various cryptographic tasks on quantum data with unconditional security. The notions of encryption and authentication (which proves a state has not been changed) are much more closely associated than they are for classical data. I will also discuss the notion of quantum secret sharing, in which a quantum state is split among many people so that small groups cannot learn anything about the state while larger groups can get full information.