  We propose a simple method for realizing a multiqubit phase gate of one qubit
simultaneously controlling $n$ target qubits, by using three-level quantum
systems (i.e., qutrits) coupled to a cavity or resonator. The gate can be
implemented using one operational step and without need of classical pulses,
and no photon is populated during the operation. Thus, the gate operation is
greatly simplified and decoherence from the cavity decay is much reduced, when
compared with the previous proposals. In addition, the operation time is
independent of the number of qubits and no adjustment of the qutrit level
spacings or the cavity frequency is needed during the operation.
