##### Department of Mathematics,

University of California San Diego

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### Quantum Information

## Gilad Gour

#### UCSD

## Concurrence monotones and remote entanglement distributions

##### Abstract:

I extend the definition of concurrence into a family of entanglement monotones, which I call concurrence monotones. I will discuss their properties and advantages as computational manageable measures of entanglement. I will then show that the concurrence monotones provide bounds on quantum information tasks. As an example, I will discuss their applications to remote entanglement distributions (RED) such as entanglement swapping and Remote Preparation of Bipartite Entangled States (RPBES). I will present a powerful theorem which states what kind of (possibly mixed) bipartite states or distributions of bipartite states can not be remotely prepared. The theorem establishes an upper bound on the amount of G-concurrence (one member in the concurrence family) that can be created between two single-qudit nodes of quantum networks by means of tripartite RED. For pure bipartite states the bound on the G-concurrence can always be saturated by RPBES.

Host:

### October 29, 2004

### 3:00 PM

### AP&M 6438

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