A four-party unlockable bound-entangled state

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  • 3 January 2000
Abstract
We present a four-party unlockable bound-entangled state, that is, a mixed quantum state which cannot be written in a separable form, and yet when two parties come together in the same laboratory, they can, by local quantum operations and classical communication, enable the other two parties to share are pure Bell state. This unlocking ability can be viewed in two ways, as either a determination of which Bell state is shared in the mixture, or as a kind of quantum teleportation with cancellation of Pauli operators.

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