AtMol Research Seminars
Seminar Archive

Unless otherwise advertised, all talks are in room Ph30 at 1:00pm on Wednesdays.

Epiphany Term 2015

Date Speaker Institution
Strong Interactions in Alkaline-Earth Rydberg Ensembles
Wed 14 Jan 2015 Rick Mukherjee Max Planck Institute for the Physics of Complex Systems

Ultra-cold atoms in optical lattices provide a versatile and robust platform to study fundamental condensed-matter physics problems and have applications in quantum optics as well as quantum information processing. For many of these applications, Rydberg atoms (atoms excited to large principal quantum numbers) are ideal due to its long coherence times and strong interactions. However, one of the pre-requisite for such applications is identical confinement of ground state atoms with Rydberg atoms. This is challenging for conventionally used alkali atoms. In this talk, I would like to discuss the potential of using alkaline-earth Rydberg atoms for many-body physics by implementing simultaneous trapping for the relevant internal states. In particular, I will discuss a scheme for generating multi-particle entanglement and explore charge transport in a one dimensional atomic lattice.

Journal Club: Topologically Protected States in AMO Physics
Wed 21 Jan 2015 Nikola Sibalic Durham University

Sometimes measurable properties of the system depend directly on the global shape of the state space, as measured by topological invariants. These properties are then well reproducible and produce countable values. Their global character protects them against changes due to local perturbations. This concepts are already exploited in secondary voltage and resistance standards, that are consistent between each other to several parts in 10^17 and 10^10 respectively, in spite in microscopic variations between the produced standards. In recent years, interest in this concepts has been renewed due to discovery of novel states of mater (topological insulators [1]) and theoretically predicted possibility for particle statistics in 2-dimensional systems that is between bosonic and fermionic statistics, raising hopes for possible quantum computation approaches insensitive to local perturbations [2].

In this talk I will cover the history of basic topological ideas in physics, before giving examples from atomic, optical and molecular physics. We will see details of topologically protected transport phenomena [3] and possible avenues for preparation of the states with non-trivial topology [4].

[1] M.Z.Hassan, C.L.Kane, Reviews of Modern Physics 82:3045 (2010)
[2] C. Nayek et al, Reviews of Modern Physics 90:1083 (2008); P. Zanardi, S. Lloyd, PRL 90:067902 (2003); L. Jiang et al, Nature Physics 4:482 (2008)
[3] M.Hafezi et. al, Nature Physics 7:907 (2011); M.Hafezi et.al, Nature Photonics 7:1001 (2013); Kitagawa T. et al, PRA 82, 033429 (2010); Kitagawa, T. et al, Nat. Commun. 3:882 (2012)
[4] N.Yao et al, PRL 110:185302 (2013); N. Cooper, J. Dalibard, PRL 110:185301 (2013); D.Peter et al, arXiv:1410.5667 (2014); M. Maghrebi et al. arXiv:1411.6624 (2014)

Semiconductor Devices for Quantum Security Technologies
Wed 28 Jan 2015 Robert Young Lancaster University

In the present day there is only one commercial application of quantum information processing (QIP), quantum key distribution, and the market embracing it is small. The development of further applications requires the realisation of a suite of practical devices that are able to create, buffer, process and repeat quantum information. Semiconductor structures have dominated digital informations history, as their ease of use and scalability are both ideal in meeting market demands. In the Quantum Technology Centre at Lancaster University we are developing semiconductor devices for practical applications of QIP, and in this talk I will discuss our progress.

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