A Research Fellow is to be appointed at Birmingham, to start by October 2009, on my EPSRC project to apply techniques of geometric logic to the topos approaches to quantum theory (Isham and Doering at Imperial, Landsman's group at Nijmegen).

The job is now posted online at Birmingham, application deadline 10th June 2009; go to http://www.hr.bham.ac.uk/jobs/ and search by post number 43408. There will be an advertisement on http://www.jobs.ac.uk/ shortly.

You can also find all that information on my website at


ArXiv identifier: 
Steve Flammia
Dave Bacon and Steven T. Flammia

The difficulty in producing precisely timed and controlled quantum gates is a significant source of error in many physical implementations of quantum computers. Here we introduce a simple universal primitive, adiabatic gate teleportation, which is robust to timing errors and many control errors and maintains a constant energy gap throughout the computation above a degenerate ground state space. Notably this construction allows for geometric robustness based upon the control of two independent qubit interactions.

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A team of physicists from Austria has sent pairs of entangled photons, which can be used to encrypt messages with complete security, between telescopes spaced 144km apart in the Canary Islands. The researchers say that preserving entanglement over this distance shows the feasibility of carrying out quantum cryptography using a worldwide network of satellites.

ArXiv identifier: 
S. Virmani
M. B. Plenio and S. Virmani

We consider the possibility of adding noise to a quantum circuit to make it efficiently simulatable classically. In previous works this approach has been used to derive upper bounds to fault tolerance thresholds - usually by identifying a privileged resource, such as an entangling gate or a non-Clifford operation, and then deriving the noise levels required to make it `unprivileged'. In this work we consider extensions of this approach where noise is added to Clifford gates too, and then `commuted' around until it concentrates on attacking the non-Clifford resource.