Stark tuning and charge state control in individual telecom C-band quantum dots
Abstract
Telecom wavelength quantum dots (QDs) are emerging as a promising solution for generating deterministic single-photons compatible with existing fiber-optic infrastructure. Emission in the low-loss C-band minimizes transmission losses, making them ideal for long-distance quantum communication. In this work, we present a demonstration of both Stark tuning and charge state control of individual InAs/InP QDs operating within the telecom C-band. These QDs are grown by droplet epitaxy and embedded in an InP-based n++-i-n+ heterostructure, fabricated using MOVPE. The gated architecture enables the tuning of emission energy via the quantum-confined Stark effect, with a tuning range exceeding 2.4 nm. It also allows for control over the QD charge occupancy, enabling access to multiple discrete excitonic states. Electrical tuning of the fine-structure splitting is further demonstrated, opening a route to entangled-photon-pair generation at telecom wavelengths. The single-photon character is confirmed via second-order correlation measurements. These advances enable QDs to be tuned into resonance with other systems, such as cavity modes and emitters, marking a critical step toward scalable, fiber-compatible quantum photonic devices.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (15)
N. J. Martin
School of Mathematical and Physical Sciences, University of Sheffield 1 , Sheffield S3 7RH,
A. J. Brash
School of Mathematical and Physical Sciences, University of Sheffield 1 , Sheffield S3 7RH,
A. Tomlinson
School of Mathematical and Physical Sciences, University of Sheffield 1 , Sheffield S3 7RH,
E. M. Sala
EPSRC National Epitaxy Facility, University of Sheffield 2 , Sheffield S1 4DE,
E. O. Mills
School of Mathematical and Physical Sciences, University of Sheffield 1 , Sheffield S3 7RH,
C. L. Phillips
School of Mathematical and Physical Sciences, University of Sheffield 1 , Sheffield S3 7RH,
R. Dost
School of Mathematical and Physical Sciences, University of Sheffield 1 , Sheffield S3 7RH,
L. Hallacy
School of Mathematical and Physical Sciences, University of Sheffield 1 , Sheffield S3 7RH,
P. Millington-Hotze
School of Mathematical and Physical Sciences, University of Sheffield 1 , Sheffield S3 7RH,
D. Hallett
School of Mathematical and Physical Sciences, University of Sheffield 1 , Sheffield S3 7RH,
K. A. O'Flaherty
EPSRC National Epitaxy Facility, University of Sheffield 2 , Sheffield S1 4DE,
J. Heffernan
EPSRC National Epitaxy Facility, University of Sheffield 2 , Sheffield S1 4DE,
M. S. Skolnick
School of Mathematical and Physical Sciences, University of Sheffield 1 , Sheffield S3 7RH,
A. M Fox
School of Mathematical and Physical Sciences, University of Sheffield 1 , Sheffield S3 7RH,
L. R. Wilson
School of Mathematical and Physical Sciences, University of Sheffield 1 , Sheffield S3 7RH,