Collapse and revival and cat states with an N-spin system

Shane Dooley*, Francis McCrossan, Derek Harland, Mark J. Everitt, Timothy P. Spiller

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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

Original languageEnglish
Article number052323
JournalPhysical Review A
Issue number5
Early online date24 May 2013
Publication statusPublished - May 2013

Cite this