Southwest Quantum Information and Technology

Entanglement in a 2-qubit system is related to the classical nonlinear dynamics

Presenting Author: Joshua Ruebeck, Carleton College
Contributing Author(s): Jie Lin, Arjendu K. Pattanayak

We analyze the few-qubit entangling quantum kicked top focusing on the time-averaged entanglement for initial spin coherent states, in the regime of recent experiments. We show a very strong connection between the classical phase-space and the average entanglement quantum phase-space, even at the extreme quantum regime of just two spin-1/2 qubits; our results agree with the experimental results. However, in contrast to standard understanding, we show that this connection does not depend on the classical chaos and we present arguments demonstrating that the connection between classical and quantum phase-spaces arises from both reflecting the symmetry of the Hamiltonian (and hence the dynamics). We are also able to show clear periodicity in entanglement as a function of number of kicks and as a function of kick strength.

(Session 5 : Thursday from 5:00 - 7:00 pm)