Characterisation of non-classical light sources for quantum information technologies Wojciech Wasilewski Michał Karpiński Piotr Wasylczyk Czesław Radzewicz.

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Presentation transcript:

Characterisation of non-classical light sources for quantum information technologies Wojciech Wasilewski Michał Karpiński Piotr Wasylczyk Czesław Radzewicz Faculty of Physics University of Warsaw Poland Piotr Kolenderski Robert Frankowski Konrad Banaszek Institute of Physics Nicolaus Copernicus University Toruń, Poland

Parametric down-conversion Energy conservation: Momentum conservation:  p =  s +  i k p  k s + k i

Twin beams

Fibre coupling

Fourier Transform Spectroscopy 

Common-path interferometer

Joint spectrum measurement W. Wasilewski, P. Wasylczyk, P. Kolenderski, K. B., and C. Radzewicz, Opt. Lett. 31, 1130 (2006)

Interferogram

Experiment vs. theory

Schmidt decomposition    

Mode pairs …what about the mode of one photon?

Two-photon interference & Probability amplitudes: – + – Photon indistinguishability = mode matching

Coincidence probability &

Single pulse t t’

Double pulse t t’

Experimental scheme W. Wasilewski, P. Kolenderski, and R. Frankowski, Phys. Rev. Lett. 99, (2007)

Simulated interferogram

Fourier transform

Experimental setup W. Wasilewski, P. Kolenderski, and R. Frankowski, Phys. Rev. Lett. 99, (2007)

Results

Output wave function Fiber coupling: Brigthness: Purity:

Optimization Brightness Purity P. Kolenderski, W. Wasilewski, and K.B., arXiv: Phys. Rev. A (in press) Geometric decorrelation: A. U’Ren, K. B., and I. A. Walmsley, Quant. Inf. Comp. 3, 480 (2003).

Spectral filtering L = 1 mm, w s = w i = 100 mm,  p = 100 fs

Multiphoton statistics Losses

Multimode model  losses  Equivalent number of (equally probable) modes M Squeezing strength r

Experimental setup W. Wasilewski, C. Radzewicz, R. Frankowski, and K. Banaszek, Phys. Rev. A 78, (2008)

Two-beam photon statistics

Equivalent number of modes   no filters  10 nm filters+ 5 nm filters

Overall detection efficiency   no filters  10 nm filters+ 5 nm filters

Contamination coefficients

Two-photon contamination   no filters  10 nm filters+ 5 nm filters

Four-photon contamination No interference filters

Non-linear waveguide M. Karpiński, C. Radzewicz, and K.B., Appl. Phys. Lett. 94, (2009)

Conclusions “Toolbox” for measuring spectral properties Modal structure an issue in multiphoton interference Spectral filtering sensible option for bulk sources Higher-order terms dangerous!