Random private quantum states

Understand

The study of properties of randomly chosen quantum states has in recent years led to many insights into quantum entanglement.

• In this work, we study private quantum states from this point of view.
• Private quantum states are bipartite quantum states characterised by the property that carrying out simple local measurements yields a secret bit.
• This feature is shared by the maximally entangled pair of quantum bits, yet private quantum states are more general and can in their most extreme form be almost bound entangled.