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First measurements of the differential positronium-formation cross-sections

Positrons are the antimatter version of electrons and so their fate in a matter world is ultimately to annihilate. However, prior to this, a positron may combine with an electron to form a matter-antimatter hybrid called positronium. This is akin to a hydrogen atom with the proton replaced by a positron. Fundamental to our understanding of the physical universe, positron and positronium are these days also acknowledged as being fantastically useful in practical applications such as probing material properties and medical diagnostics. However, there is still much that we do not know for sure about the details of the interactions of these particles with ordinary matter. For example if, in a collision with an atom or molecule, a positron captures an electron, in which directions is the positronium likely to travel and with what probability? More...

Published: Jun 17, 2015 12:35:19 PM

CO2 Satellite

New calculations to improve carbon dioxide monitoring from space

How light of different colours is absorbed by carbon dioxide (CO2) can now be accurately predicted using new calculations developed by a UCL-led team of scientists. This will help climate scientists studying Earth’s greenhouse gas emissions to better interpret data collected from satellites and ground stations measuring CO2. More...

Published: Jun 15, 2015 10:29:10 AM

Watt Steam Engine

On quantum scales, there are many second laws of thermodynamics

New research from UCL has uncovered additional second laws of thermodynamics which complement the ordinary second law of thermodynamics, one of the most fundamental laws of nature. These new second laws are generally not noticeable except on very small scales, at which point, they become increasingly important. More...

Published: Feb 10, 2015 11:55:53 AM

Quantum Information

Prof Sougato Bose Prof Tania Monteiro Dr Alexandra Olaya-Castro Jonathan Oppenheim
Dr Dan Browne Dr Alessio Serafini    

Quantum Computers, when realized, hold the promise of speeding up the solution of certain problems perceived as difficult on a classical computer, and particularly enabling the controlled simulations of the behaviour of complex many-body quantum systems. In the foreseeable future, one expects the size of individual quantum computers to be rather limited due to fundamental obstacles, and identifying viable ways to connect and network such computers to enhance their effective computational power has a high technological incentive.

We have a wide range of research interestsed within the field of quanutm information theory, mostly falling into the following categories:

  • Entanglement and quantum information
  • Quantum Optics
  • Quantum state transfer using spin chains
  • Quantum computation using higher dimensional spins
  • Quantum coherence, correlations and entanglement in photosynthetic complexes
  • Measurement-based quantum computation
  • Quantum many-body systems
  • Quantum thermodynamics

You can find more information about our research on our homepage.