One of the most vital parts of research is networking. Collaborations between groups and colleagues in your institution, your country and even across the globe make for a growing and productive scientific community. Attending conferences is a fantastic way to advertise your research and meet new people, and this year our summer of conferences began in America.
Hosted by the American Physical Society in June, Rebecca and Sam flew to Spokane Washington to attend the 54th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics (DAMOP), along with UCL colleagues Stephen, Matt and Luke. The team were greeted with a spectacular welcome reception! DAMOP is a meeting that boasts research from the entire AMO spectrum, from experimentalists and theorists alike, including Quantum optics, measurements of gravity, matter-wave interferometry, Rydberg field sensing and producing Bose-Einstein condensates in space – to name just a few. The meeting also welcomed ambassadors from industry to meet their customers and promote new products, fostering a unique opportunity for members of industry and academia to share ideas and solve new problems.

Rebecca and Sam both presented posters during the week: 2 of the 8 presentations on positronium (Ps) among over a thousand contributions. Rebecca presented the first measurement of the fluorescence decay rate of 2 3PJ Ps. Measurements of the Ps decay processes are excellent tests of bound state QED theory and potential signposts to new physics with this measurement being a step toward using fluorescence decays as one of these tests. Varying amounts of 2 3PJ character were introduced to metastable 2 3S1 atoms by controlling the amount of Stark mixing present with well-defined electric fields and allowing the atoms to propagate for a fixed amount of time before quenching them in large electric fields. Introducing more Stark mixing resulted in less remaining population when quenched and detailed simulations of the experiment allowed for a 2 3PJ lifetime to be extracted. Sam introduced our new Rydberg field sensing apparatus using excited states of helium. Our Ps microwave campaign thus far has seen asymmetric line shapes, shifts from theory and differing results for opposing microwave propagation directions. We investigated the last of these further by probing the fields in the experimental apparatus. Highly excited (Rydberg) states are extremely susceptible to external electric and magnetic fields and make ideal sensors for the scrutiny of experimental equipment in-situ.


Our UCL colleagues and frequent collaborators Stephen, Matt and Luke were able to Join us and gave presentations on their work. Stephen, head of the AMOPP group at UCL, gave a poster on the recent measurements in his group on the resonant energy transfer between Rydberg helium and ammonia molecules at sub 100mK temperatures. Matt, a PhD student in Stephen’s group and former Master’s student with us, gave a talk on lifetime measurements of cold Rydberg nitric oxide molecules in an electrostatic trap. Luke, also a PhD student in Stephen’s group, gave a talk on enhanced state control and tunability at a Rydberg-atom superconducting circuit interface.

We’re privileged to see the great work of our colleagues, both at UCL and around the world, coming together in such a large meeting. We’re extremely grateful to APS for hosting and organising the meeting, and to the UCL Physics and Astronomy postgraduate conference fund for providing support to Rebecca and Sam – without which wouldn’t be able to attend. Stay tuned for more updates on our research and the other conferences we went to this summer!
