1 June 2005 Multi-photon states and their measurement
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Proceedings Volume 5833, Quantum Informatics 2004; (2005) https://doi.org/10.1117/12.620515
Event: 18th International Conference on Photoelectronics and Night Vision Devices and Quantum Informatics 2004, 2004, Moscow, Russian Federation
Abstract
Generation of multi-photon states (such as for instance three- and four-photon states) is one of the most challenging problems of modern quantum optics. In many works the authors claim to have produced such states by means of overlapping photon pairs generated in spontaneous parametric down-conversion (SPDC). Moreover three- and four-photon states generated this way have been used for observing Greenberger-Horne-Zeilinger (GHZ) polarization states testing Bell's inequalities for spin-1 quantum systems preparing W-states and other applications. In this paper we show that the criterion for obtaining three- or four-photon states is the behavior of the corresponding normalized Glauber's correlation function. Calculations carried out for the case of SPDC or even PDC in the stimulated regime demonstrate that these processes are not capable of generating three- or four-photon states: photon statistics reveals typically two-photon behaviour. We suggest a method of measuring higher-order correlation functions in the pulsed regime which allows one to study multi-photon correlations for these and many other processes.
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T. Sh. Iskhakov, T. Sh. Iskhakov, O. A. Ivanova, O. A. Ivanova, Maria V. Chekhova, Maria V. Chekhova, } "Multi-photon states and their measurement", Proc. SPIE 5833, Quantum Informatics 2004, (1 June 2005); doi: 10.1117/12.620515; https://doi.org/10.1117/12.620515
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