Date: 26 November, 2004

Who: Michael Nielsen (UQ)

Seminar type: Research Talk

Date: 19 November, 2004

Who: Steve Bartlett (UQ)

Seminar type: Research Talk

Date: 12 November, 2004

Who: Steve Bartlett (UQ)

Seminar type: Research Talk

Abstract:
Determining precisely which entangled states are useful for quantum information processing (i.e., states that can be distilled into maximally-entangled Bell states), while well understood for pure-state bipartite entanglement, has proven to be notoriously difficult for mixed-state entanglement (MSE). This difficulty is due, in part, to the existence of a proper gap between states that can be locally prepared and those that can be distilled: so-called “bound entangled states”.

Recently, the study of pure-state entanglement under a restriction on quantum operations, such as the constraint of a superselection rule, has generated some surprising analogies to MSE. I’ll show how pure-state entanglement constrained by a superselection rule precisely replicates the structure of MSE, including bound entanglement and activation. Also, unsolved questions in MSE have analogous questions in constrained pure state entanglement which can be answered.

Joint work with Andrew Doherty, Robert Spekkens and Howard Wiseman.

Date: 5 November, 2004

Who:: Andrew Doherty