New PRL on positronium interactions with atoms
Posted June 12, 2018 by Andrew Brown
Positronium (Ps) is a light ‘atom’ that consists of an electron and its antiparticle (positron). This simplest matter-antimatter system is of fundamental importance for testing quantum electrodynamics, and is widely used in condensed matter for probing voids and free space, and as a precursor for making antihydrogen at CERN. In spite of its importance, the interaction and collisions of low-energy Ps with normal matter, e.g., atoms or molecules, are not fully understood. Theoretically, the problem is made challenging by the effect of structure of both the projectile and target.
In their latest paper Phys. Rev. Lett. 120, 183402 Dermot Green, Andrew Swann and Gleb Gribakin from the CTAMOP Antimatter and Atomic Many-body Theory Group present a new first-principles theoretical approach to describe Ps interactions with noble-gas atoms, which takes account of the distortion of the Ps and the atom during their interaction. Notably, they demonstrate that their approach gives the best agreement with experiment for the pick-off annihilation rate (where the positron from positronium annihilates with one of the atomic electrons), resolving a long-standing discrepancy between theory and experiment.
New Journal of Physics: 2017 Reviewer Award to CTAMOP member
Posted June 5, 2018 by Andrew Brown
Gabriele De Chiara has been awarded for the second year in a row the title of “Outstanding Reviewer” in 2017 for New Journal of Physics published by the Institute of Physics (IOP).
A full list of the awards can be found here.
“IOP is proud to recognize excellence in reviewing, and each year the journal editorial teams select the best reviewers of the year based on the quality, quantity and timeliness of their reviews.”
Editorial Role for CTAMOP Member
Posted April 3, 2018 by Andrew Brown
Prof. Mauro Paternostro has been appointed Editorial Board Member of the Springer journal EPJ Quantum Technology
The journal covers theoretical and experimental advances in subjects spanning the whole breadth of quantum technologies. Prof. Kai Bongs (University of Birmingham) has recently taken over the founding editor Prof. Gerard Milburn (University of Queensland) to lead the journal towards its consolidation as an attractive and authoritative stage for research outputs in the filed of quantum technology.
Mauro’s appointment is a token of the role that the Quantum technology Group at Queen’s is playing in the arena of quantum information processing and quantum technology.
Project TEQ funded by EC
Posted February 15, 2018 by Andrew Brown
A consortium involving CTAMOP researchers has been awarded nearly £4m in funding to test the quantum-superposition principle.
The consortium comprises researchers from CTAMOP, the University of Southampton, University College London, photonics technology company M Squared, and the University of Trieste and has been awarded €4.4m (£3.9m) from the European Commission.
The full story can be found here
New Postgraduate Project Available
Posted November 24, 2017 by Ian Stewart
A new project proposal for PhD study in the Centre for Theoretical Atomic Molecular and Optical Physics (CTAMOP) have now been made available through the centre’s website. The closing date is 15th December 2017.
Full details of the project can be found in the postgraduate studies section of the website and from there applications can be submitted online. We are happy to receive applications from all interested parties.
If you would like to discuss a project with a potential supervisor, contact details can be found in the project descriptions. For general queries about PhD study, please contact Prof. Mauro Paternostro.
Two new Doctors from CTAMOP
Posted November 20, 2017 by Andrew Brown
Two CTAMOP PhD students have successfully navigated their PhD vivas.
Michael Turkington, who has been working with Connor Ballance on heavy species R-matrix calculations in support of fusion diagnostics defended his thesis on 30th October. Dr. Martin O’Mullane from the University of Strathclyde was the external examiner.
Ruari McCloskey returned to the department from his job at Allstate insurance on 17th November to defend his thesis on dynamic and logical irreversibility in open quantum systems. Ruari was co-supervised by Mauro Paternostro, Alessandro Ferraro, and Gabriele De Chiara, and was examined by Dr. Bassano Vacchini from Milan University.
Congratulations to both Michael and Ruari and their supervisory teams.
Back-to-back(!) PRLs for CTAMOP researcher Dermot Green
Posted by Andrew Brown
Two papers from EPSRC Fellow and CTAMOP member Dermot Green have appeared back-to-back in the highly prestigious pages of Physical Review Letters.
The papers Phys. Rev. Lett. 119, 203403 (2017) and Phys. Rev. Lett. 119, 203404 (2017) describe the processes of positron cooling and annihilation in room-temperature noble gases, simulated using accurate positron-atom data calculated with the many-body theory developed by the Antimatter and Atomic Many-Body Theory Group at QUB.
The work has enabled the first simultaneous probing of the energy dependence of the positron scattering cross sections, annihilation rates and annihilation gamma spectra, has yielded the best description of long-standing experimental results to date, and has resolved outstanding “puzzles” in the field: e.g., establishing that the significant discrepancy between gas-cell and trap-based measurements of the “thermal” positron annihilation rate in Xenon is a result of the rapid annihilation of low-energy positrons leading to a quasi-steady-state positron momentum distribution that differs from the Maxwell-Boltzmann one.
John Bell Lecture 2017
Posted October 26, 2017 by Andrew Brown
John Bell Day 2017 will take place on Monday 6th November. The anniversary of the publication of Bell’s ground breaking theorem is marked by a public lecture, which is hosted this year by the Chief Executives’ Club at Queen’s and the Royal Irish Academy. The event will take place at Riddel Hall, Queen’s University Belfast, on Monday 6 November 2017, from 5.30pm.
The guest speaker will be Professor Antonio Acín, Group Leader of Quantum Information Theory, at the Institute of Photonic Sciences, based in Barcelona. He will explore the impact from John Stewart Bell’s work and the advances now being made in quantum computing, in an address entitled: ‘Quantum Information and Communication: The Legacy of John Bell’.
John Stewart Bell, a Belfast scientist and Queen’s graduate, who worked at CERN, made one of the most profound discoveries of science. ‘Bell’s Theorem’ resolved a decades old dispute involving Albert Einstein and showed that Einstein’s views on quantum mechanics were incorrect. Bell’s work laid the foundation for quantum information technology which will revolutionise the world of computing, particularly in the areas of financial services and cyber security.
As information devices, such as smart phones become smaller and smaller, Professor Acín and his team are working at the cutting edge of Quantum Information Theory to explore the possibilities and limitations that Quantum Physics may offer for future developments.
Professor Sally Wheeler, interim Pro-Vice-Chancellor for Research and Enterprise at Queen’s and Senior Vice-President of the Royal Irish Academy will give the welcome address and introduce the guest speaker.
Pre-lecture refreshments will be available from 5.30pm, and the talks will begin at 6pm.
To secure a place please email firstname.lastname@example.org.
CTAMOP welcomes new Post-Doctoral researcher
Posted September 18, 2017 by Andrew Brown
A warm welcome (back) to Dr. Gregory Armstrong, who joins CTAMOP on a two year contract this week.
Gregory will be working in the intense laser matter area with Prof. Hugo van der Hart and Dr. Andrew Brown on the EPSRC-funded Software Flagship project: ‘R-matrix suites for multielectron attosecond dynamics in atoms and molecules irradiated by arbitrarily polarised light’ (or R-MADAM for short).
Gregory completed his PhD in CTAMOP under the supervision of Prof. Ken Taylor, before heading to the USA for two post-doc appointments: firstly in the Los Alamos National Lab, and then Kansas State University.
International prize awarded to Dermot Green
Posted August 15, 2017 by Andrew Brown
CTAMOP member and EPSRC Fellow Dermot Green was awarded the 2017 ICPEAC ‘Sheldon Datz prize’ for Outstanding Young Scientist attending ICPEAC (International Conference on Photonic, Electronic and Atomic Collisions) one of the two flagship international conferences in atomic physics.
The prize recognises Dermot’s leading work developing many-body theory of positron and positronium interactions with atoms and molecules. It was awarded following nomination and selection by the ICPEAC international committee prior to the recent conference in Cairns, Australia. Dermot received the award from the ICPEAC International Chair Hossein Sadeghpour (ITAMP, Harvard) in the ‘Sheldon Datz prize’ plenary session of the conference, where he presented a special report on his work.
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