We present a method to swap information between atomic states by manipulating the interaction time between a quantum cavity field and two two-level atoms. We show that quantum information carried by one atom can be transferred onto the state of the second atom.
PRESENTAMOS UN METODO PARA INTERCAMBIAR INFORMACION ENTRE ESTADOS ATOMICOS MEDIANTE LA MANIPULACION DEL TIEMPO DE INTERACCION ENTRE DOS ATOMOS DE DOS NIVELES Y UN CAMPO ELECTROMAGNETICO CUANTIZADO. MOSTRAMOS QUE LA INFORMACION CONTENIDA EN UN ATOMO PUEDE SER ESCRITA EN UN ESTADO ”EN BLANCO DE UN SEGUNDO ATOMO, BORRANDO POR COMPLETO LA INFORMACION DEL PRIMERO. Abstract WE PRESENT A METHOD TO SWAP INFORMATION BETWEEN ATOMIC STATES BY MANIPULATING THE INTERACTION TIME BETWEEN A QUANTUM CAVITY FIELD AND TWO TWO-LEVEL ATOMS. WE SHOW THAT QUANTUM INFORMATION CARRIED BY ONE ATOM CAN BE WRITTEN ONTO A ”BLANK” STATE OF THE SECOND ATOM, AND THE INFORMATION CONTAINED IN ATOM ONE IS COMPLETELY ERASED.
An alternative scheme is proposed to transfer quantum states and prepare a quantum network in cavity QED. It is based on the interaction of a two-mode cavity field with a three-level ∨-type atom. In the scheme, the atom-cavity field interaction is resonant, thus the time required to complete the quantum state transfer process is greatly shortened, which is very important in view of decoherence. Moreover, the present scheme does not require one mode of the cavities to be initially prepared in one-photon state, thus it is more experimentally feasible than the previous ones.