In this paper, we present the experimental realization of multiqubit gates
Lambda (n)(NOT) in macroscopic ensemble of three-qubit and four-qubit molec
ules. Instead of depending heavily on the two-bit universal gate, which ser
ved as the basic quantum operation in quantum computing, we use pulses of w
ell-defined frequency and length that simultaneously apply to all qubits in
a quantum register. It appears that this method is experimentally convenie
nt when this procedure is extended to more qubits on some quantum computati
on, and it can also be used in other physical systems.