Collapse and Revival and Cat States with an N Spin System

2013/02/28 by Shane Dooley, Francis McCrossan, Derek Harland +2 · 1 citation
Physics and Astronomy · #quant-ph

paper · pdf · doi:10.1103/physreva.87.052323

published as Phys. Rev. A 87, 052323 (2013) · 7 pages, 6 figures

arxiv created 2013/05/15 · arxiv updated 2015/03/12

Abstract

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 behaviour 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 "Schrodinger 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.

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