James Allen and A.M. Zagoskin
Loughborough University, Loughborough, Leics LE11 3TU, UK
Received October 31, 2012
We derive the Bloch-type equations of motion for the Wigner function of a qubit nonlinearly coupled to a linear
oscillator, and investigate their usefulness in the quantum-classical transition regime.
PACS: 03.67.–a Quantum information;PACS: 03.67.Lx Quantum computation architectures and implementations;PACS: 05.30.–d Quantum statistical mechanics.
Key words: qubit, oscillator, coherent state, Wigner function, Bloch equations, cat states, collapse and revival.