Correlated Spontaneous Emission Laser as an Entanglement Amplifier

Abstract

We consider a two-photon correlated emission laser as a source of an entangled radiation with a large number of photons in each mode. The system consists of three-level atomic schemes inside a doubly resonant cavity. We study the dynamics of this system in the presence of cavity losses, concluding that the creation of entangled states with photon numbers up to tens of thousands seems achievable.

Entanglement conditions for two-mode states: Applications

“…These conditions are expressed in terms of quantities that are at most quadratic in mode creation and annihilation operators. They have been used, for example, to study entanglement in correlated emission laser systems [11,12]. More recently, sufficient conditions for entanglement have been found for a wider class of states [13]- [15].…”

A macroscopical entangled coherent state generator in a V configuration atom system

“…These include correlated spontaneous emission laser (CEL) [10], lasing without inversion [11] and electromagnetically induced transparence [12] etc.. It has been known that two cavity modes can be entangled when they interact with three-level atoms [10,13] and atomic coherence plays an essential role in this entanglement generation [14,15]. Ref.…”

“…Ref. [14] showed that the two-mode macroscopically entangled continuous-variable state could be created in a CEL system where the atomic coherence was induced by a classical driving field. Ref.…”

Effect of phase fluctuation and dephasing on the dynamics of entanglement generation in a correlated emission laser

“…In recent years, a nondegenerate three-level laser has attracted a great deal of interest in relation to its potential as a reliable source of robust entangled light [1][2][3][4][5][6]. The nonclassical features of the radiation are predominantely attributed to the atomic coherence induced by initially preparing the atoms in a coherent superposition of the energy levels between which a direct spontaneous transition is electric dipole forbidden [1,2] or by pumping the same with an external radiation [3][4][5][6].…”

“…The nonclassical features of the radiation are predominantely attributed to the atomic coherence induced by initially preparing the atoms in a coherent superposition of the energy levels between which a direct spontaneous transition is electric dipole forbidden [1,2] or by pumping the same with an external radiation [3][4][5][6]. However, due to the fragility of the coherent superposition, the pertinent continuous variable entanglement is believed to be significantly ruined by various phenomena closely associated with the lasing process; noteworthy among many are dephasing and phase fluctuations.…”