A generalized Mach–Zehnder-type interferometer equipped with cross-Kerr elements is proposed to convert N -photon truncated single-mode quantum states into ( N + 1)-mode single-photon states, which are suitable for further state manipulation by means of beamsplitter arrays and ON/OFF-detections, and vice versa. Applications to the realization of unitary and non-unitary transformations, quantum state reconstruction and quantum telemanipulation are studied.
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Clausen et al. (2002) studied this question.
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