文摘
Using information entropy squeezing theory, we investigate the information entropy squeezing properties of atomic qubit inside a microwave cavity by manipulating the other atomic qubit outside the cavity, where two atomic qubits are initially in the Bell state. We discuss the time evolution of entropy squeezing factor for atomic qubit inside the cavity for two cases, namely before and after performing rotation operations and measuring atomic qubit outside by numerical calculation. It is shown that atomic qubit inside the cavity has always no entropy squeezing phenomenon before manipulating atomic qubit outside the cavity. However, the optimal entropy squeezing state of atomic qubit can be generated by adjusting appropriate rotation angle and choosing interaction time between atomic qubit and the cavity field. The essential idea is cutting the entanglement between atomic qubit and its environment, leading the initial decoherent state into maximal coherent superposition state. Our proposal provides a possible way for recovering coherence of single atomic qubit in noise environment.