Collective multiphoton blockade in cavity quantum electrodynamics

Abstract

We present a study of collective multi-photon blockade in coherently driven atoms in a single mode cavity. Considering two atoms strongly coupled to an optical cavity, we show that the twophoton blockade with two-photon anti-bunching, and the three-photon blockade with three-photon anti-bunching can be observed simultaneously. The three-photon blockade probes both dressed states in the two photon and three photon spaces. The two photon and three photon blockades strongly depend on the location of two atoms in the strong coupling regime. The asymmetry in the atom-cavity coupling constants opens new pathways for multiphoton blockade which is also shown to be sensitive to the atomic decay and pumping strengths. The work presented here predicts many new quantum statistical features due to the collective behavior of atoms and can be useful to generate non-classical photon pairs.

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

“…Cavity-driven scheme. -Since two atoms have the same coupling strength (i.e., in-phase radiation), the anit-symmetric Dicke states |−, n are dark states, decoupling to other states in this system [39,40]. In the cavity driven scheme, therefore, one can also observe two different transition pathways for the two-photon excitations, corresponding to |gg, 1 To obtain the optimal condition for achieving the destructive quantum interference between these two pathways, we also solve the amplitude equations [similar to Eqs.…”

Two-photon blockade in a cascaded cavity-quantum-electrodynamics system

“…In this section, we focus on the discussion of the applications and experimental realization of our proposal. We know that the multiphoton blockade has been observed in various systems [28][29][30][31][32][33] and the single-photon blockade effect has already been reached experimentally [2,8,15]. The main request for achieving these effects is the presence of strong nonlinearities.…”

Simultaneous blockade of a photon, phonon, and magnon induced by a two-level atom

“…It is believed that photon blockade can be used as a single photon source and to process quantum information [3]. The photon blockade in the cavity-QED systems [4][5][6] were thoroughly investigated and have been achieved in experiments [7,8]. Recently, the optomechanical system has attracted significant attention, such as working as a sensor to detect tiny mass and force [9][10][11][12] , a platform to investigate the fundamental physics [13] and a device to processing quantum information [14][15][16][17][18][19][20].…”

“…The photon blockade can be generated from the destructive interference [25,38] as well as the single excitation resonance [6,21,[39][40][41]. Usually, the destructive interference and the single excitation resonance resulting from dressed states can supply a better blockade than the Kerr effect because of the weak coupling strength of the Kerr interaction.…”