Decoherence, pointer engineering, and quantum state protection.
We present a proposal for protecting states against decoherence, based on the engineering of pointer states. We apply this procedure to the vibrational motion of a trapped ion, and show how to protect qubits, squeezed states, approximate phase eigenstates, and superpositions of coherent states.
Carvalho
A R
AR
Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, 21945-970 Rio de Janeiro, RJ, Brazil.
Milman
P
P
de Matos Filho
R L
RL
Davidovich
L
L