Research Bio.

I graduated in 2008 with an MSci in Natural Sciences at Durham University having focussed on Physics, Mathematics and Philosophy. My final year MSci project explored the Stark Map of Rubidium (and an unnerving amount of Fortran 90) as the strong dipole-dipole interactions between Rydberg states are an exciting candidate for quantum logic gates.

I began my PhD in Quantum Information Theory at the University of St Andrews in late September 2008, funded by COMPASS and the EPSRC.

Current Research

I am particularly fascinated by quantum correlations. In the past few decades Quantum Entanglement, or “spooky action at a distance” has become an increasingly inviting topic to researchers looking to utilise the nonlocal correlations evident in some quantum systems. Part of my research has explored the possibility of increasing the entanglement between two macroscopic atomic ensembles, a process known as Entanglement Distillation, but this begs the question: How can I quantify the amount of entanglement in a system? Consequently, I am also interested in entanglement measures and separability criteria in continuous variable systems.

In fact, while entanglement could be seen as a consequence of the superposition principle, more general forms of nonclassical correlations arise essentially from the non-commutativity of quantum observables. I have been working to classify these correlations using such tools as Quantum Discord.

My Thesis is available at
RT Thesis

Research Topics

Dr. Tatham's research topics include:

• Continuous Variable Non-Classicality Measures
• Entanglement Distillation
• Entanglement Theory for Gaussian States

Publications

R. Tatham and N. Korolkova
Entanglement Concentration with Quantum Non Demolition Hamiltonians
Submitted to Phys. Rev. A, ArXiv

R. Tatham, L. Mista, G. Adesso and N. Korolkova:
Nonclassical correlations in continuous-variable non-Gaussian Werner states
Phys. Rev. A 85 022326 (2012), ArXiv

R. Tatham and N. Korolkova:
Entanglement concentration for two atomic ensembles using an effective atom-light beamsplitter
J. Phys. B: At. Mol. Opt. Phys. 44 175506 (2011), ArXiv

L. Mista, R. Tatham, D. Girolami, N. Korolkova and G. Adesso:
Measurement-induced disturbances and non-classical correlations of Gaussian states
Phys Rev A 83 042325 (2011), ArXiv

R. Tatham, D. Menzies and N. Korolkova:
An approximate beamsplitter interaction between light and atomic ensembles
Phys. Scr. T143 014023 (2011)

Supervision

Dr. Natalia Korolkova nvk@st-andrews.ac.uk

Quantum Information