Presentation is loading. Please wait.

Presentation is loading. Please wait.

Single Photons from Coupled Quantum Modes Tim Liew & Vincenzo Savona Institute of Theoretical Physics, Ecole Polytechnique Federale de Lausanne (EPFL),

Similar presentations


Presentation on theme: "Single Photons from Coupled Quantum Modes Tim Liew & Vincenzo Savona Institute of Theoretical Physics, Ecole Polytechnique Federale de Lausanne (EPFL),"— 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 A Verger, C Ciuti & I Carusotto, PRB, 73, 193306 (2006) Single Mode Polariton Blockade Optical Limiter Need confinement in an area 200nm x 200nm E (meV) k || (mm -1 ) P n Planar Cavity

3 Two Mode System 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) 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 Photonic Crystal Cavities D Gerace, et al., Nature Phys., 5, 281 (2009)

4 E E1E1 E2E2 Theory Hamiltonian: Master Equation: J   F    =0.012 meV (3um size) [J Kasprzak, et al., PRB, 75, 045326] J=0.5 meV (3um boxes, 1um apart)  =0.2 meV (3.3 ps)

5 Second Order Correlation Function For the same value of , coupling to a second mode significantly decreases the value of g 2 For =0.02, p(n 1 >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 F E E1E1 E2E2 E3E3   

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 g 2 (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


Download ppt "Single Photons from Coupled Quantum Modes Tim Liew & Vincenzo Savona Institute of Theoretical Physics, Ecole Polytechnique Federale de Lausanne (EPFL),"

Similar presentations


Ads by Google