Implementing universal multi-qubit quantum logic gates in three and four-spin systems at room temperature

摘要

In this paper, we present the experimental realization of multi-qubit gates$% \Lambda_n(not) $ in macroscopic ensemble of three-qubit and four-qubitmolecules. Instead of depending heavily on the two-bit universal gate, whichserved as the basic quantum operation in quantum computing, we use pulses ofwell-defined frequency and length that simultaneously apply to all qubits in aquantum register. It appears that this method is experimentally convenient whenthis procedure is extended to more qubits on some quantum computation, and itcan also be used in other physical systems.