State evolution and information processing in Mn 12 quantum magnet

Abstract

Following an alternative version of Grover's algorithm, we propose a scheme to readin information in Mn 12 molecular magnets with the help of multi-frequency magnetic pulses in two separate steps: first to realize an intermediate state |Ψ(T 1)) and then to reach the state |Ψ(T 2)) to encode information. All controllable parameters are calculated to implement read-in of information, and the durations of magnetic pulses are less than the dephasing time of quantum states in Mn 12. It is also shown that all the states of information can be initialized back to the intermediate state.