Photoelectron counting in quantum optics
Photoelectron counting in quantum optics
Photoelectron counting in quantum optics
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Coherence functionsDef<strong>in</strong>itionsNotation x = (r, t).G (1) (x, x ′ ) ≡ 〈E (−) (x)E (+) (x ′ )〉 (12)G (2) (x 1 , x 2 , x ′ 2, x ′ 1) ≡ 〈E (−) (x 1 )E (−) (x 2 )E (+) (x ′ 2)E (+) (x ′ 1)〉. (13)Based on photon absorption <strong>in</strong>tensity 〈I (x)〉 = G (1) (x, x).G (1) describes first order coherence: Mach-Zehnder (Young,Michelson) <strong>in</strong>terference.G (2) describes second order coherence: Hanbury Brown, Twiss.