Deterministic radiative coupling of two semiconductor quantum dots to the optical mode of a photonic crystal nanocavity

Abstract

A system of two site-controlled semiconductor quantum dots (QDs) is deterministically integrated with a photonic crystal membrane nano-cavity. The two QDs are identified via their reproducible emission spectral features, and their coupling to the fundamental cavity mode is established by emission co-polarization and cavity feeding features. A theoretical model accounting for phonon interaction and pure dephasing reproduces the observed results and permits extraction of the light-matter coupling constant for this system. The demonstrated approach offers a platform for scaling up the integration of QD systems and nano-photonic elements for integrated quantum photonics applications.

Nano‐Cavity QED with Tunable Nano‐Tip Interaction

“…This increases experimental flexibility enabling, for example, measurement of anticrossing curves through addressing different emitters with intrinsically varying cavity detuning δ instead of changing fundamental experimental parameters like laser power or temperature that can impact the underlying system properties . One can envision a broad range of new experiments based on this flexibility, such as TESC imaging in 2D Van der Waals materials, the investigation of randomly located single photon emitting defects in solid state systems that are difficult to probe with stationary plasmonic cavities despite their exceptional properties for quantum information and technology, and coupling of multiple single emitters for entanglement and superradiance . While room temperature strong coupling is feasible in nano‐plasmonic cavities, it has been assumed that the strong dissipation and dephasing introduced by the thermal vibrational reservoir at these temperatures would make them inaccessible to technologies that require quantum coherence and control of single emitter‐photon states.…”

Site‐Controlled Single‐Photon Emitters Fabricated by Near‐Field Illumination

“…Perhaps the most successful approach is represented by the self-limited growth of QDs into inverted pyramidal holes etched in a GaAs substrate 12,13 . This approach gave a record-low inhomogeneous emission broadening of 1.4 meV 14 , and it was used for the integration of sitecontrolled QDs with PhC cavities, showing weak coupling [15][16][17][18] . QDs grown in larger pyramids (with typical size of 7.5 µm), not integrable in PhC cavities, have reached a very good homogeneous broadening of 10 µeV 19 .…”

Quantum repeaters based on individual electron spins and nuclear-spin-ensemble memories in quantum dots

“…We propose the use of CAPS-based gates because the QDs can be separated by several hundred nanometers [63], whereas performing the gate via the electric dipolar interaction [18] requires that the QDs be situated relatively close together, around 20 nm. Additionally, experimental demonstrations have shown that QDs are promising on-demand single-photon sources with high single-photon purity and indistinguishability [64][65][66].…”

“…Such an approach was utilized in the work of Ref. [63], where the deterministic integration of two InGaAs QDs with a planar linear three-hole defect (L3) PhC cavity was demonstrated for two QDs separated by 350 nm.…”