Three-qubit quantum-gate operation in a cavity QED system
Amitabh Joshi, Min Xiao · Physical Review A · 2006
A scheme is proposed to obtain three-qubit gates, such as quantum-phase gate and ${C}^{2}$-NOT gate operations, in a cavity QED system where highly detuned cavity-field modes interact with a four-level system in an inverted-Y configuration. The influence of the Stark shift is also included in such proposed gate operations. Since only the metastable lower levels are involved in the gate operations, the gates are not affected by the atomic decay rates. The potential application of such gates to realize Grover's algorithm is also discussed.