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We discuss collapse and revival of Rabi oscillations in a system comprising aqubit and a "big spin" (made of N qubits, or spin-1/2 particles). Wedemonstrate a regime of behaviour analogous to conventional collapse andrevival for a qubit-field system, employing spin coherent states for theinitial state of the big spin. These dynamics can be used to create a"Schrodinger cat" state of the big spin. Even for relatively small values of N,states with significant potential for quantum metrology applications canresult, giving sensitivity approaching the Heisenberg limit.

Collapse and Revival and Cat States with an N Spin System