date: 12/03/13

Description:
762 mode (signal) is split using a fiber 50/50 beam-splitter and APD counts recorded with channel 2 and 3 of timestamp.
795 clicks recorded with channel 1 of timestamp.
The purpose of the experiment is to verify the single photon characteristic of 762 mode when heralded by the detection of 795 photon. G(2) between the channels 2 and 3 is performed when there is a pair within the coincidence window of 30 ns between channel 1&2 or between 1&3.

Conditional g(2) is defined as (eqn.(1))

	(N1*G123|G12(t))/(G12*G13(t)) + (N1*G123|G13(t))/(G13*G12(t))  
where
	N1          - Total number of 795 clicks (singles).
	G12(t)	    - G(2) between channels 1 & 2 as a function of delay between clicks in 1 & 2 .
	G12	    - Total coincidences between 1 & 2 within coincidence window of 30 ns.
	G13(t)	    - G(2) between channels 1 & 3 as a function of delay between clicks in 1 & 3.
        G13         - Total coincidences between 1 & 3 within coincidence window of 30 ns.
	G123|G12(t) - G(2) between channel 2 and 3 given that there is a pair between 1 & 2 within coincidence window.
	G123|G13(t) - G(2) between channel 2 and 3 given that there is a pair between 1 & 3 within coincidence window.

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plots:

pairwise_g2_plots.eps 	- plots of G12(t), G13(t), G123|G12(t)+G123|G13(t) 
conditional_g2.eps	- normalized conditional g(2) plot

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combined_g2_762.dat: processed data file 
	column 1 - Time delay from the arrival of 795 photon
	column 2 - G12(t) with a timing resolution of 2 ns obtained from g2.c
	column 3 - G13(t) with a timing resolution of 2 ns obtained from g2channel13.c
	column 4 - G123|G12 (t) obtained from conditional_g2.c
	column 5 - G123|G13 (t) obtained from conditional_g2.c
	column 6 - Error in first part of conditional g(2) (eqn (1))
	column 7 - Error in second part of conditional g(2) (eqn (1))

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Other Parameters:

	MOT Optical density ~ 32
	780 pump power = 425 uW
	776 pump power = 3.7 mW