Abstract
Scalable quantum systems require deterministic entangled photon pair sources. Here, we demonstrate a scheme that uses a dipole-coupled defect pair to deterministically emit polarization-entangled photon pairs. Based on this scheme, we predict spectroscopic signatures and quantify the entanglement with physically realizable system parameters. We describe how the Bell state fidelity and efficiency can be optimized by precisely tuning transition frequencies. A defect-based entangled photon pair source would offer numerous advantages including flexible on-chip photonic integration and tunable emission properties via external fields, electromagnetic environments, and defect selection.
Highlights
Nonclassical states of light are important resources for quantum technologies, such as quantum information processing, networking, and metrology [1]
The electron-photon coupling Hamiltonian in the rotating wave approximation (RWA) and dipole approximation is Hel−ph = − opjl E jl · dop|o p|a†jl + H.c., where E jl is the electric field with magnitude E in the l direction that we assume to be constant for all j, and dop = o|er|p with |o and |p being quantum states of the combined twoemitter system
The emission cascade caused by the radiative decay of the optically excitable |xyS state of the composite emitter-emitter system results in the emission of x- and y-polarized photons whose number spectra are generally distinct, as we show in Fig. 2(a) for the parameters given in the figure caption
Summary
Nonclassical states of light are important resources for quantum technologies, such as quantum information processing, networking, and metrology [1]. We present a method of initializing the system with orthogonally polarized continuous wave lasers that involves two-photon absorption to enable Rabi oscillations between the ground and symmetric doubly excited state of the pair. When emitters α and β at positions rα and rβ , respectively, are brought close and couple via electric dipole interactions, the total electronic Hamiltonian Hel can be written in the product space of the two three-level systems as. The electron-photon coupling Hamiltonian in the RWA and dipole approximation is Hel−ph = − opjl E jl · dop|o p|a†jl + H.c., where E jl is the electric field with magnitude E in the l direction that we assume to be constant for all j, and dop = o|er|p with |o and |p being quantum states of the combined twoemitter system. Further details on obtaining Eq (7) are in Appendix B
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