NUI MAYNOOTH  DEPARTMENT OF MATHEMATICAL PHYSICS SEMINAR

Friday 18th August 2006 at 3:15pm
Lecture Hall CS1, Callan Building, NUIM North Campus


Derek McHugh
Research Center for Quantum Information
Institute of Physics, Slovak Academy of Sciences
Bratislava, Slovak Republic

Entanglement, purity and energy of
discrete and continuous variable quantum states



Abstract:

In this talk I will outline the relationship between the entanglement, mixedness and energy of two-qubit and two-mode Gaussian states. Parameterizing the set of allowed states of these two fundamentally different systems using measures of entanglement, mixedness and energy allows us to compare and contrast the two systems using a phase diagram. This phase diagram enables one to clearly identify not only the physically allowed states of each system, but also the set of states connected under an arbitrary quantum operation. Particular attention is paid to the maximally entangled mixed states of each system. Following this I will talk about how efficiently one may transfer entanglement from two-mode to two-qubit states.


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All are welcome. Tea/coffee and biscuits to follow. For those considering coming from Dublin, there is a commuter train to Maynooth which is leaving Dublin-Pearse Street Station at 2:15pm and arriving to Maynooth at 2:57 pm. Directions to the Dept. can be found at http://www.thphys.nuim.ie/images/map.html