Blue-to-green single photons from InGaN/GaN dot-in-a-nanowire ordered arrays

Abstract

-Single photon emitters (SPEs) are at the basis of many applications for quantum information management. Semiconductor-based SPEs are best suited for practical implementations because of high design flexibility, scalability and integration potential in practical devices. Single photon emission from ordered arrays of InGaN nano-disks embedded in GaN nanowires is reported. Intense and narrow optical emission lines from quantum dot-like recombination centers are observed in the blue-green spectral range. Characterization by electron microscopy, cathodoluminescence and micro-photoluminescence indicate that single photons are emitted from regions of high In concentration in the nano-disks due to alloy composition fluctuations. Single photon emission is determined by photon correlation measurements showing deep antibunching minima in the second order correlation function. The present results are a promising step towards the realization of on-site/on-demand single photon sources in the blue-green spectral range operating in the GHz frequency range at high temperatures.Introduction. -Single photons are ideal "flying" qubits to convey quantum information between distant nodes of a quantum network. Reliable and controlled generation of single photons is therefore a crucial step to develop applications for quantum communication, quantum information processing and quantum metrology [1,2]. Single photons can be emitted in principle by material entities possessing discrete energy levels, as they need a finite time to "recharge" after emission of one photon. The standard method to assess single photon emission is to measure the second order photon correlation function by Hanbury-Brown and Twiss (HBT) interferometry. As shown in Fig. 1, single photons are either reflected or transmitted by a beam splitter, so that the probability of simultaneous detection in the two detectors of the interferometer is zero. The detection events are stored in a Time-Correlated Single Photon Counter (TCSPC), and the resulting correlation function g 2 (τ) shows an

Control of single photon emitters in semiconductor nanowires by surface acoustic waves

“…2(d). The histogram reveals a pronounced antibunching dip at zero-time delay (τ = 0) with the anti-bunching value of g (2) (0) = 0.07 ± 0.04 obtained after correction for finite temporal resolution of the HBT setup and the contribution of background photons (including the APDs dark counts and the contribution from additional emission centers within the detection area) [48,49]. This value is well below the 0.5 two-photon threshold, thus proving the quantum nature of When the SAW is applied (with a frequency f 3 = 338 MHz at low temperature) the emission spectrum undergoes an apparent splitting of the two emission lines ( Fig.…”

Measurement of the Emission Lifetime of a GaN Interface Fluctuation Quantum Dot by Power Dependent Single Photon Dynamics

“…In this letter, we report a measurement of the lifetime of a GaN interface fluctuation QD by measurements of the photon autocorrelation of the single photon emission from such a dot under various excitation powers . Comparing our measurement with data from typical SK GaN QDs, we gain some insight into the relatively narrow linewidths exhibited by these QDs.…”

Acoustically regulated optical emission dynamics from quantum dot-like emission centers in GaN/InGaN nanowire heterostructures

“…As detailed in Refs. [7,14,15,16], the QD-like emission centers under study are formed by alloy composition fluctuations in the topmost part of the InGaN region.…”