Indistinguishable Photons from Independent Semiconductor Nanostructures

Abstract

We demonstrate quantum interference between photons generated by the radiative decay processes of excitons that are bound to isolated fluorine donor impurities in ZnSe/ZnMgSe quantum-well nanostructures. The ability to generate single photons from these devices is confirmed by autocorrelation experiments, and the indistinguishability of photons emitted from two independent nanostructures is confirmed via a Hong-Ou-Mandel dip. These results indicate that donor impurities in appropriately engineered semiconductor structures can portray atomlike homogeneity and coherence properties, potentially enabling scalable technologies for future large-scale optical quantum computers and quantum communication networks.

Complete quantum control of exciton qubits bound to isoelectronic centres

“…For the nitrogen pair configuration shown in Fig. 1a, large-ensemble photoluminescence (PL) measurements reveal an inhomogeneous broadening lower than 25 GHz 15 , which is comparable to that of NV centres and other atomic defects 16,17 . This high optical homogeneity is of strategic importance as it reduces the implementation complexity of quantum processing schemes.…”

Two-Photon Interference from the Far-Field Emission of Chip-Integrated Cavity-Coupled Emitters

“…[7][8][9] Many of these applications rely on optical qubits that exhibit two-photon quantum interference on a beamsplitter, the primary mechanism for achieving effective photon-photon interactions. A number of works have reported such two-photon interference from a variety of solid-state quantum emitters such as defect centers, 10,11 dophants, 12 and quantum dots. [13][14][15][16][17][18][19][20][21][22] But these sources exhibit isotropic emission that is often difficult to collect efficiently.…”

Single-photon generation from a nitrogen impurity center in GaAs

“…To have well-defined energy is an important factor for the coupling with microcavities and photonic crystals, as well as for the generation of indistinguishable photon pairs. 6 Energetically defined single-photon generation has been demonstrated in highly homogeneous NN pairs in GaP. 7 The radiative lifetime of NN pairs in GaP is rather long (56 ns), 8 probably due to the indirect bandgap nature of the host material.…”