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Compound Semiconductor Quantum Technology

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I was fortunate enough to attend a Rank Prize meeting in Cumbria this week on visible and UV photonics, whilst representing my group's recent work. Great speakers showing interesting results for several days away from the office was good for my brain. Thanks to Profs Martin Dawson, Rachel Oliver and Michael Strain for organising this fascinating event. Congratulations to Bilge on passing his viva yesterday! Bilge's project was on quantum light sources in Aluminium nitride funded by the EU project @lasiondef . He was a wizard in the cleanroom and a jedi master with lumerical, so this PhD was well deserved. Thanks to @haddenjp for co-supervision, and Dr Alex Clark and Francesco Maria for examining. As is now traditional, I made Bilge something to remember his time with us, as he continues to more success at the university of Southampton. We have a new paper out in Optica Quantum. It is the result of a collaboration with the wonderful Thomas Bracht, Moritz Cygorek and Doris Reiter in Dortmund University, aiming to understand the statistics of multiphoton states from quantum dots. Their theory, coupled with our experimental work, has unravelled the physics driving the sequences of photons emitted. Last week some of the group helped out at the “Museum after dark” event at the National Museum as part of Cardiff Science Week. They were showing off some quantum technology, some semiconductors and some photonics to approx. 1,000 visitors. Not hip hop. Well done to (R-L) JP, Liv, Alfie, Harry and Joseph for supporting this important outreach event.  Well done to Sam on leading this work we have just published in ACS Photonics. In the paper we show a new technique to pinpoint the location of quantum emitters within a few nanometers, at a resolution much below the expected ~ wavelength scale resolution of the optical system. Through repeated measurements which are cross referenced to markers on the sample surface, we can then etch away semiconductor around the emitter to create an optical resonator. This leads to enhanced photon collection and preserves the quantum nature of the emitted light. I have high hopes this technique can be used for many of our future experiments and inspire similar work in other materials. We have a new paper out in APL Photonics. Working with Cambridge University’s Centre for Gallium Nitride, we have shown for the first time, how to grow this technologically important semiconductor with quantum emitters at a controlled depth. Previously, it was known that these emitters form in the first stages of growth, which always leaves them at the bottom of the crystal layer. Using the process described in the paper, we can grow the emitters at arbitrary depth which is essential for future applications of these emitters in useful devices. As Gallium Nitride is a favoured material for LED lighting and high-power electronics, there are lots of device designs we can now explore that build on this breakthrough. I was on a panel discussion at Wales Tech Week yesterday in the international conference centre. Discussion quantum technology with Anke Lohmann of Anchored in, Zoe Davison of BT, Iwan Davies from IQE and Paul Ceely from the Digital Catapult. It was a great pleasure for us to host the annual ‘Quantum Dot Day’ in Cardiff University this year. The meeting topic was expanded to include many site-controlled quantum emitters in different materials such as diamond, GaN, hBN as well as our old friends the quantum dots. We had a great turnout, many cutting-edge and informative talks, excellent posters and industry support from Laser2000, PI-KEM, Toptica,Lambda Photometrics, Quantum Design, the Institute for Compound Semiconductors and the Institute of Physics. Special thanks to our invited speakers Prof Christian Bonato, Dr Elisa Sala, Dr Charlotte Ovenden and Dr Aymeric Delteil.

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