Interfering pathways for photon blockade in cavity QED with one and two qubits

Understand

We theoretically study the quantum interference induced photon blockade phenomenon in atom cavity QED system, where the destructive interference between two different transition pathways prohibits the two-photon excitation.

• Here, we first explore the single atom cavity QED system via an atom or cavity drive.
• We show that the cavity-driven case will lead to the quantum interference induced photon blockade under a specific condition, but the atom driven case can't result in such interference induced photon blockade.
• Then, we investigate the two atoms case, and find that an additional transition pathway appears in the atom-driven case.