Quantum phase gate of photonic qubits in a cavity QED system
Jing Shu, Xu‐Bo Zou, Yun‐Feng Xiao, Guang‐Can Guo · Physical Review A · 2007
A scheme is proposed to realize a two-qubit quantum phase gate for the intracavity modes. In the scheme, two qubits are encoded in zero- and one-photon Fock states of two intracavity modes, and the three-level $\ensuremath{\Lambda}$-type atom trapped in a high-$Q$ cavity mediates the conditional phase gate within a given interaction time. The influence of cavity decay and atomic spontaneous emission on the gate fidelity is also discussed.