Quantum information concepts used to probe condensed-matter
systems, particularly topologically ordered states.

Masud Haque, MPI Komplexer Physik, Dresden.


I will first give an overview of recent uses of entanglement
concepts from quantum information to probe quantum
many-particle physics.  I particular, I will focus on the
entropy of entanglement between regions of a topologically
ordered state.

I will then present our calculations of the entanglement
entropy in fractional quantum Hall (FQH) states.
Calculating the entanglement entropy between spatially
separated regions allows us to probe the topological order in
Laughlin and Moore-Read states.  In addition, the
entanglement entropy between particle subsets in the FQH
states probes the "exclusion statistics" of FQH
quasiparticles.

Finally, I will provide preliminary results on entanglement
entropy calculations in other related condensed matter
states.

References:

(1) Phys. Rev. Lett. 98, 060401 (2007)  [cond-mat/0609263]

(2) arXiv:0705.4176