Abstract.
The U(1,1) and U(2) transformations realized by three-mode interaction in the respective parametric approximations are studied in conditional measurement, and the corresponding non-unitary transformation operators are derived. As an application, the preparation of single-mode quantum states using an optical feedback loop is discussed, with special emphasis on Fock-state preparation. For that example, the influence of non-perfect detection and feedback is alsoconsidered.
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Received: 12 July 2000 / Revised version: 19 September 2000 / Published online: 30 November 2000
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Clausen, J., Hansen, H., Knöll, L. et al. Conditional quantum-state engineering in repeated 2-photon down-conversion . Appl Phys B 72, 43–50 (2001). https://doi.org/10.1007/s003400000480
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DOI: https://doi.org/10.1007/s003400000480