1 / 10

Single Photons from Coupled Quantum Modes

Single Photons from Coupled Quantum Modes. Tim Liew & Vincenzo Savona. Institute of Theoretical Physics, Ecole Polytechnique Federale de Lausanne (EPFL), Switzerland. Single Mode Polariton Blockade Two coupled modes (polariton boxes) - Master Equation for the density matrix

luke
Télécharger la présentation

Single Photons from Coupled Quantum Modes

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Single Photons from Coupled Quantum Modes Tim Liew & Vincenzo Savona Institute of Theoretical Physics, Ecole Polytechnique Federale de Lausanne (EPFL), Switzerland • Single Mode Polariton Blockade • Two coupled modes (polariton boxes) • - Master Equation for the density matrix • - Single Photon Statistics • - Linear Fluctuation Theory • Three couple modes (parametric scattering) • - Single Photon Statistics • - Level Diagram • Comparison of different systems & Effect of dephasing

  2. Single Mode Polariton Blockade Optical Limiter n E (meV) A Verger, C Ciuti & I Carusotto, PRB, 73, 193306 (2006) k|| (mm-1) P Planar Cavity Need confinement in an area 200nm x 200nm

  3. Two Mode System • Metal surface pattern • C W Lai, et al., Nature, 450, 529 (2007) • S Utsunomiya, et. al., Nature Phys., 4, 700 (2008) • C Symonds, et al., APL, 95, 151114 (2009) • M Kaliteevski, et al., APL, 95, 251108 (2009) • Pattern Cavity Thickness • R Idrissi Kaitouni, et al., PRB, 74, 155311 (2006) • R Cerna, et al., PRB, 80, 121309 (2009) • Apply Stress • R Balili, et al., Science, 316, 1007 (2007) • Coupled Micropillar Cavities • D Bajoni, et al., APL, 90, 051107 (2007) • D Bajoni, et al., PRL, 100, 047401 (2008) • Optical Excitation • A Amo, et al., arXiv:1003.0131 (2010) • Coupled Photonic Crystal Cavities • D Gerace, et al., Nature Phys., 5, 281 (2009)

  4. Theory Hamiltonian: J=0.5 meV (3um boxes, 1um apart) G E a G a J E2 a=0.012 meV (3um size) [J Kasprzak, et al., PRB, 75, 045326] E1 F G=0.2 meV (3.3 ps) Master Equation:

  5. Second Order Correlation Function For the same value of a, coupling to a second mode significantly decreases the value of g2 For <N1>=0.02, p(n1>1)=0.18% (five times better than the failure rate of devices based on spontaneous parametric down conversion)

  6. Linear Fluctuation Theory

  7. Parametrically Coupled Modes G a E G E3 a E2 G F a E1

  8. Level Diagram Diagonalize the Hamiltonian This state can only be reached via decay from an n=3 state

  9. Comparison of different schemes Pure dephasing term (exciton-phonon scattering): • D F Walls & G J Milburn, PRA, 31, 2403 (1985)

  10. Summary Noise correlations between coupled quantum modes can deliver better single photon statistics than a single isolated mode. The enhancement is such that with the nonlinearity available in today’s samples, one can find a low value of g2 (despite dephasing). One can also consider using parametrically coupled modes to improve single photon statistics. • T C H Liew & V Savona, PRL, to be published April 2010

More Related