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The significance of beamsplitter in experimental optical quantum informationprocessing and quantum technology is discussed with a focus on the role of abeamsplitter-type Hamiltonian in the recent development in this field ofresearch. Here, we follow a new approach to briefly describe quantummeasurement, Bell measurement, quantum state engineering, quantumteleportation, cryptography, and computation using both discrete and continuousvariables to establish the wide applications of beamsplitter-type operation.Finally, we also discuss the limitations of this linear optical element.

Are optical quantum information processing experiments possible without beamsplitter?