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Several sequential operations are usually needed for implementing controlledquantum gates and generating entanglement between a pair of quantum bits. Basedon the conditional quantum dynamics for a two-ion system beyond the Lamb-Dickelimit, here we propose a theoretical scheme for manipulating two-qubit quantuminformation, i.e., implementing a universal two-qubit quantum gate andgenerating a two-qubit entangled state, by using a pair of simultaneous laserpulses. Neither the Lamb-Dicke approximation nor the auxiliary atomic level arerequired. The experimental realizability of this simple approach is alsodiscussed

Coherently manipulating two-qubit quantum information using a pair of simultaneous laser pulses