**Mladen Pavicic
**

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Institut für Theoretische Physik,
TU Berlin, Hardenbergstraße 36, D-10623 Berlin 12, Germany
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Atominstitute of the Austrian Universities,
Schüttelstraße 115, A-1020 Wien, Austria; pavicic@ati.ac.at
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Department of Mathematics, University of Zagreb,
GF, Kaciceva 26, POB-217, HR-10001 Zagreb, Croatia; mpavicic@faust.irb.hr; http://m3k.grad.hr/pavicic
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** Abstract. **
Spin interferometry of the
4th order for independent polarized as well as

**PACS numbers: **03.65.Bz, 42.50.Wm

**Keywords: **two photon interferometry, quantum optics