  Recent development in quantum information sciences and technologies,
especially building programmable quantum computers, provide us new
opportunities to study fundamental aspects of quantum mechanics. We propose
qubit models to emulate the quantum measurement process, in which the quantum
information of a qubit is mapped to a collection of qubits acting as the
measurement device. One model is motivated by single-photon detection and the
other by spin measurement. Both models are scalable to generate Schr\"{o}dinger
cat-like state, and their corresponding quantum circuits are shown explicitly.
Large-scale simulations could be realized in near-term quantum computers, while
classical computers cannot perform the same task efficiently. Due to the
scalability of the models, such simulations can help explore the
quantum-to-classical boundary, if exists, in the quantum measurement problem.
Besides, our protocol to generate cat states may have important applications in
quantum computing and metrology.
