Barreto Group

Dr Jorge Barreto
Director of Quantum Engineering CDT and Senior Lecturer

Research interests and activities

My group’s efforts cover a broad spectrum of topics. Our ultimate goal is to develop techniques, devices and solutions that enable exploiting the potential of integrated photonics with special emphasis on quantum information processing. We explore light-matter interaction for the efficient generation of quantum states of light, devise schemes for scalable photonic circuits and analyse the trade-offs in complex photonic systems.

Fig 1: Novel optical modulation mechanism for cryogenic photonics Fig 2: Optimising the trade-off between purity and brightness in cavity-based probabilistic photon sources

Characterising non-linear optical properties of waveguides at cryogenic temperatures

Ultra-fast optical modulation at cryogenic temperatures using Barium Titanate thin flims (in collaboration with IBM)

Major research topics

Quantum Devices
Quantum Systems Engineering
Single Photon Detectors
Photon Sources
Cryogenics
Scalability

(pictured above: High-performance cryocooler and adapted cryogenic FPGA control unit)

Current postdocs and research fellows

Dr Imad Faruque
Senior Research Associate

Current PhD students

Panawat Wongklaew
Molly Thomas
Daniel Marchant

Recent publications

B.M. Burridge, et al. ''Zero-Power Calibration of Photonic Circuits at Cryogenic Temperatures'', ACS Photonics 8, 9, 2683–2691 (2021)
F. Eltes, et al. ''An integrated optical modulator operating at cryogenic temperatures'', Nature Materials volume 19, pages 1164–1168 (2020)
G.F. Sinclair, et al. ''Temperature Dependence of the Kerr Nonlinearity and Two-Photon Absorption in a Silicon Waveguide at 1.55 μm'', Phys. Rev. Applied 11, 044084
(2019)
N.A. Tyler, et al. ''Modelling superconducting nanowire single photon detectors in a waveguide cavity'', Opt. Express 24, 8797-8808 (2016)