Triggered single-photon emission and cross-correlation properties in InAlAs quantum dot

Abstract

Triggered single-photon generation from InAlAs quantum dot (QD) was demonstrated for the first time. Emitted photon energy coincides with high detection efficiency range of Si single-photon detectors, which is highly suitable for free-space communication. Single-QD spectroscopy and crossed photon correlation measurements unambiguously revealed that several emitting lines observed in a single mesa structure originated from the identical QD, and two temporary competing decay processes associated with neutral states and charged states were identified. Presence of the competing process is also inferred from an analysis of steady-state photoluminescence intensities. Formation process of charged exciton in QD is also discussed.

Deterministic Single-Photon and Polarization-Correlated Photon Pair Generations From a Single InAlAs Quantum Dot

“…The adjacent periodic correlation peaks represent an X 0 photon emission by one laser pulse and subsequent X À photon emission by the next pulse after a 12.2-ns interval. The observed antibunching directly exhibits that the two emission lines X 0 and X À originate from the same single QD, 85,86 and that neutral and charged excitons are formed exclusively with each other in the same QD.…”

“…Figure 12a. The PL intensities as a function of excitation power were analyzed by applying a ladder model, 82,85 which is composed of 0-3 excitonic multiplex states as depicted in Figure 12b. By solving the rate equations, steady-state PL intensities I x and I xx are expressed as…”

Superconductor-Based Quantum-Dot Light-Emitting Diodes: Role of Cooper Pairs in Generating Entangled Photon Pairs

“…[10][11][12][13] In isotropic QDs the bright heavy-hole exciton state (X) is spin-degenerate, and the biexciton recombination takes place either in right-circularly polarized (σ + ) or left-circularly polarized (σ -) with the photon energy of E xx , which is doubly degenerate as shown in Fig. 1(a).…”

Single photon emission with high degree of circular polarization from a single quantum dot under zero magnetic field

“…1. Four emission lines originating from positively charged exciton (X + ), neutral exciton (X 0 ), neutral biexciton (XX 0 ), and negatively charged exciton (X − ) were dominant, which were assigned and confirmed by several independent measurements [13,14]. Measured second-order photon correlation function g (2) (τ) unambiguously revealed the single photon emission operation from the single QD in terms of anti-bunching behaviour when the X + emission line was introduced into a so-called HBT setup together with either X 0 or X − emission lines.…”