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Semiário de Óptica e Informação Quântica

Data: Sexta-Feira 10/10/2014, Sala A5-01, 11 am.

Palestrante: Gabriel Aguilar (UFRJ)

Título: Linear-Optical Simulation of the Cooling of a Cluster-State Hamiltonian System

Resumo: A measurement-based quantum computer could consist of a local-gapped Hamiltonian system, whose thermal states {at su ciently low temperature{ are universal resources for the computation.
Initialization of the computer would correspond to cooling the system. We perform an experimental quantum simulation of such cooling process with entangled photons. We prepare three-qubit thermal
cluster states exploiting the equivalence between local dephasing and thermalisation for these states. This allows us to tune the system temperature by changing the dephasing strength. We monitor
the entanglement as the system cools down and observe the transitions from separability to bound entanglement, and then to free entanglement. We also analyse the performance of the system for
measurement-based single-qubit state preparation. These studies constitute a basic characterisation
of experimental cluster-state computation under imperfect conditions.

Phys. Rev. Lett. 112, 160501 (2014)
http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.112.160501