On June 30, to mark the completion of the Beecroft Building, the members of the Rudolf Peierls Centre for Theoretical Physics, who occupy the building above ground, and the members of the Quantum Information Technology hub (NQIT), who are installing kit in many of its subterranean laboratories, will join forces to explain the basic principles underlying the quantum dynamics of composite systems and to describe the challenge of implementing quantum computation and cryptography practically.

In the afternoon there will be three talks from NQIT, which is led by Oxford University. A general introduction to the programme will be followed by two talks about using ion traps and photonics to build a quantum computer. There will also have a chance to see the new labs via exclusive video and an opportunity to questions NQIT researchers.

You will have an opportunity to explore the Beecroft Building (above ground) between 09.00-10.30.

**Speakers**

**Quantum Systems from Group up**

The first talk will review the modern formulation of the basic ideas of quantum mechanics. We start by explaining what quantum amplitudes are, how they lead to the idea of a quantum state and how these states evolve in time. We then discuss what happens when a measurement is made before describing correlated ('entangled') systems. Applying these ideas to two-state systems ('qubits') we point out that the complexity of computing the evolution of an N qubit system grows like exp(N).