Center for Photonic Communication and ComputingMcCormick School of Engineering and Applied Science Entanglement of Macroscopic Ensembles (Schroedinger’s.

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Presentation transcript:

Center for Photonic Communication and ComputingMcCormick School of Engineering and Applied Science Entanglement of Macroscopic Ensembles (Schroedinger’s Cat) Team: Alex Heifetz (Graduate Student) Dr. Ashish Agarwal (Post-Doc) Prof. Prem Kumar (Collaborator) Prof. Philip Hemmer (Texas A&M; collaborator) Prof. Saxena (Visitor) Supported By: DARPA, NSF

Center for Photonic Communication and ComputingMcCormick School of Engineering and Applied Science ENS 1 ENS 2 DET 1 DET 2  |g> |e> BS LASER DET 1 GENERATING ENSEMBLE ENTANGLEMENT

Center for Photonic Communication and ComputingMcCormick School of Engineering and Applied Science  |g> |e> C L ADVANTAGE OF THE MACROSCOPIC APPROACH

Center for Photonic Communication and ComputingMcCormick School of Engineering and Applied Science Field + Atom + Cavity e b a e b a Laser Field Cavity Mode or System

Center for Photonic Communication and ComputingMcCormick School of Engineering and Applied Science Wavefunction where Initial condition before the interaction

Center for Photonic Communication and ComputingMcCormick School of Engineering and Applied Science Number states Light in state a e b

Center for Photonic Communication and ComputingMcCormick School of Engineering and Applied Science Hamiltonian

Center for Photonic Communication and ComputingMcCormick School of Engineering and Applied Science Time evolution If we design the system such that then time evolution reduces to

Center for Photonic Communication and ComputingMcCormick School of Engineering and Applied Science Laser in state Coherent State Photon distribution Coupling constant Wavefunction

Center for Photonic Communication and ComputingMcCormick School of Engineering and Applied Science Classical Laser Field Cavity Mode or e b a  Result

Center for Photonic Communication and ComputingMcCormick School of Engineering and Applied Science Interaction time Single Photon Detector

Center for Photonic Communication and ComputingMcCormick School of Engineering and Applied Science Set-up for Entanglement generation Laser B B A A D1D1 D2D2

Center for Photonic Communication and ComputingMcCormick School of Engineering and Applied Science Entangled Atomic States Conditional click in Either D 1 Or D 2 Photon Annihilation in Detector Projected Atomic State = Atom A Atom B

Center for Photonic Communication and ComputingMcCormick School of Engineering and Applied Science Single Photon Detector Many Particle System

Center for Photonic Communication and ComputingMcCormick School of Engineering and Applied Science Collective Enhancement Collective enhancement factor

Center for Photonic Communication and ComputingMcCormick School of Engineering and Applied Science Laser B B A A D1D1 D2D2 Entanglement of atomic ensembles Conditional on detector click, Atomic ensembles are Entangled:

Center for Photonic Communication and ComputingMcCormick School of Engineering and Applied Science Atomic Ensemble: 87 Rb Laser Field Raman signal F=2 F= GHz P 3/2 F=2 P 3/2 F=1 P 3/ GHz

Center for Photonic Communication and ComputingMcCormick School of Engineering and Applied Science Raman Spectroscopy Set-up Argon ion Laser Ti-Sapphire Laser Rb Heat- Pipe Oven 

Center for Photonic Communication and ComputingMcCormick School of Engineering and Applied Science Rubidium Raman Laser Argon ion Laser Ti-Sapphire Laser Rb Heat Pipe Oven PZT  Spectrum Analyzer s p p OC

Center for Photonic Communication and ComputingMcCormick School of Engineering and Applied Science TRAPPING OF LIGHT IN A Pr:YSO CRYSTAL

Center for Photonic Communication and ComputingMcCormick School of Engineering and Applied Science “Observation of Ultraslow and Stored Light Pulses in a Solid,” A. V. Turukhin, V.S. Sudarshanam, M.S. Shahriar, J.A. Musser, B.S. Ham, and P.R. Hemmer, Phys. Rev. Lett. 88, (2002). TRAPPING OF LIGHT IN A Pr:YSO CRYSTAL