https://doi.org/10.1140/epjd/e2008-00088-0
Quantum states transfer between coupled fields
1
Centro Federal de Educação Tecnológica do Rio de Janeiro, Departamento de Educação Superior-DEPES, 22., 290-180 Rio de Janeiro, Brazil
2
Centro Brasileiro de Pesquisas Físicas /CNPq, rua Dr. Xavier Sigaud 150, CEP 22., 290-180 Rio de Janeiro, Brazil
3
Instituto de Física, Universidade Federal de Goiás, PO-Box-131, 74., 001-970 Goiania, Brazil
Corresponding author: a sbd@cbpf.br
Received:
4
March
2008
Published online:
7
May
2008
We study the exchange of states in coupled fields along their time evolution. The coupling is described by a quadratic form in terms of annihilation and creation operator in the field Hamiltonian. An analytical approach is employed to describe the time evolution of the field state in Fock's space and the conditions for an arbitrary initial states to be transferred with 100% fidelity is determined. We show that only for initial states C0|0>+CN|N>, this situation can occurs. The important |1〉↔|0〉 qubits transfer is a particular case of this transference of number state. The relation between the coupling constant and characteristic field frequencies for complete state transference is also determined.
PACS: 42.50.-p – Quantum optics / 42.50.Ex – Optical implementations of quantum information processing and transfer / 42.50.Pq – Cavity quantum electrodynamics; micromasers
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2008
